xapian — Xapian Python Bindings 1.4.10 documentation

# Source code for xapian

    # encoding: utf-8
    # This file was automatically generated by SWIG (http://www.swig.org).
    # Version 3.0.13
    #
    # Do not make changes to this file unless you know what you are doing--modify
    # the SWIG interface file instead.

    """
    Xapian is a highly adaptable toolkit which allows developers to easily
    add advanced indexing and search facilities to their own applications.
    It has built-in support for several families of weighting models
    and also supports a rich set of boolean query operators.

    In addition to the doc strings provided by this python library, you
    may wish to look at the library's overall documentation, either
    installed along with the bindings or online at
    <https://xapian.org/docs/bindings/python/>, as well as the library's
    documentation, possibly installed with the library or with its
    development files, or again online at <https://xapian.org/docs/>.
    """

    from . import _xapian
    from new import instancemethod as new_instancemethod

    def _swig_setattr(self, class_type, name, value):
        if (name == "thisown"):
            return self.this.own(value)
        if (name == "this"):
            if type(value).__name__ == 'SwigPyObject':
                self.__dict__[name] = value
                return
        method = class_type.__swig_setmethods__.get(name, None)
        if method:
            return method(self, value)
        object.__setattr__(self, name, value)

    def _swig_getattr(self, class_type, name):
        if (name == "thisown"):
            return self.this.own()
        method = class_type.__swig_getmethods__.get(name, None)
        if method:
            return method(self)
        raise AttributeError("'%s' object has no attribute '%s'" % (class_type.__name__, name))

    def _swig_repr(self):
        strthis = ""
        if hasattr(self.this, '__repr__'):
            strthis = "proxy of " + self.this.__repr__()

        return "<%s.%s; %s >" % (self.__class__.__module__, self.__class__.__name__, strthis,)

    from weakref import proxy as weakref_proxy

    __version__ = '1.4.10'

    class SwigPyIterator(object):
        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')

        def __init__(self, *args, **kwargs):
            raise AttributeError("No constructor defined - class is abstract")
        __repr__ = _swig_repr
        __swig_destroy__ = _xapian.delete_SwigPyIterator
        def __iter__(self):
            return self
    SwigPyIterator.value = new_instancemethod(_xapian.SwigPyIterator_value, None, SwigPyIterator)
    SwigPyIterator.incr = new_instancemethod(_xapian.SwigPyIterator_incr, None, SwigPyIterator)
    SwigPyIterator.decr = new_instancemethod(_xapian.SwigPyIterator_decr, None, SwigPyIterator)
    SwigPyIterator.distance = new_instancemethod(_xapian.SwigPyIterator_distance, None, SwigPyIterator)
    SwigPyIterator.equal = new_instancemethod(_xapian.SwigPyIterator_equal, None, SwigPyIterator)
    SwigPyIterator.copy = new_instancemethod(_xapian.SwigPyIterator_copy, None, SwigPyIterator)
    SwigPyIterator.next = new_instancemethod(_xapian.SwigPyIterator_next, None, SwigPyIterator)
    SwigPyIterator.__next__ = new_instancemethod(_xapian.SwigPyIterator___next__, None, SwigPyIterator)
    SwigPyIterator.previous = new_instancemethod(_xapian.SwigPyIterator_previous, None, SwigPyIterator)
    SwigPyIterator.advance = new_instancemethod(_xapian.SwigPyIterator_advance, None, SwigPyIterator)
    SwigPyIterator.__eq__ = new_instancemethod(_xapian.SwigPyIterator___eq__, None, SwigPyIterator)
    SwigPyIterator.__ne__ = new_instancemethod(_xapian.SwigPyIterator___ne__, None, SwigPyIterator)
    SwigPyIterator.__iadd__ = new_instancemethod(_xapian.SwigPyIterator___iadd__, None, SwigPyIterator)
    SwigPyIterator.__isub__ = new_instancemethod(_xapian.SwigPyIterator___isub__, None, SwigPyIterator)
    SwigPyIterator.__add__ = new_instancemethod(_xapian.SwigPyIterator___add__, None, SwigPyIterator)
    SwigPyIterator.__sub__ = new_instancemethod(_xapian.SwigPyIterator___sub__, None, SwigPyIterator)
    SwigPyIterator_swigregister = _xapian.SwigPyIterator_swigregister
    SwigPyIterator_swigregister(SwigPyIterator)

    MSET_DID = _xapian.MSET_DID
    MSET_WT = _xapian.MSET_WT
    MSET_RANK = _xapian.MSET_RANK
    MSET_PERCENT = _xapian.MSET_PERCENT
    MSET_DOCUMENT = _xapian.MSET_DOCUMENT
    ESET_TNAME = _xapian.ESET_TNAME
    ESET_WT = _xapian.ESET_WT
    class Error(Exception):
        """

        All exceptions thrown by Xapian are subclasses of Xapian::Error.

        This class can not be instantiated directly - instead a subclass
        should be used.
        """

        __swig_setmethods__ = {}
        __setattr__ = lambda self, name, value: _swig_setattr(self, Error, name, value)
        __swig_getmethods__ = {}
        __getattr__ = lambda self, name: _swig_getattr(self, Error, name)

        def __init__(self, *args, **kwargs):
            raise AttributeError("No constructor defined")
        __repr__ = _swig_repr

        def get_type(self):
            """

            The type of this error (e.g. "DocNotFoundError".)

            const char* Xapian::Error::get_type() const
            """
            return _xapian.Error_get_type(self)

        def get_msg(self):
            """

            Message giving details of the error, intended for human consumption.

            const std::string& Xapian::Error::get_msg() const
            """
            return _xapian.Error_get_msg(self)

        def get_context(self):
            """

            Optional context information.

            const std::string& Xapian::Error::get_context() const

            This context is intended for use by Xapian::ErrorHandler (for example
            so it can know which remote server is unreliable and report the
            problem and remove that server from those being searched). But it's
            typically a plain-text string, and so also fit for human consumption.

            """
            return _xapian.Error_get_context(self)

        def get_error_string(self):
            """

            Returns any system error string associated with this exception.

            const char* Xapian::Error::get_error_string() const

            The system error string may come from errno, h_errno (on UNIX), or
            GetLastError() (on MS Windows). If there is no associated system error
            string, NULL is returned.
            """
            return _xapian.Error_get_error_string(self)

        __swig_destroy__ = _xapian.delete_Error
    Error.get_type = new_instancemethod(_xapian.Error_get_type, None, Error)
    Error.get_msg = new_instancemethod(_xapian.Error_get_msg, None, Error)
    Error.get_context = new_instancemethod(_xapian.Error_get_context, None, Error)
    Error.get_error_string = new_instancemethod(_xapian.Error_get_error_string, None, Error)
    Error.__str__ = new_instancemethod(_xapian.Error___str__, None, Error)
    Error_swigregister = _xapian.Error_swigregister
    Error_swigregister(Error)

    class LogicError(Error):
        """

        The base class for exceptions indicating errors in the program logic.

        A subclass of LogicError will be thrown if Xapian detects a violation
        of a class invariant or a logical precondition or postcondition, etc.

        """

        __swig_setmethods__ = {}
        for _s in [Error]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, LogicError, name, value)
        __swig_getmethods__ = {}
        for _s in [Error]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, LogicError, name)

        def __init__(self, *args, **kwargs):
            raise AttributeError("No constructor defined")
        __repr__ = _swig_repr
        __swig_destroy__ = _xapian.delete_LogicError
    LogicError_swigregister = _xapian.LogicError_swigregister
    LogicError_swigregister(LogicError)

    class RuntimeError(Error):
        """

        The base class for exceptions indicating errors only detectable at
        runtime.

        A subclass of RuntimeError will be thrown if Xapian detects an error
        which is exception derived from RuntimeError is thrown when an error
        is caused by problems with the data or environment rather than a
        programming mistake.
        """

        __swig_setmethods__ = {}
        for _s in [Error]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, RuntimeError, name, value)
        __swig_getmethods__ = {}
        for _s in [Error]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, RuntimeError, name)

        def __init__(self, *args, **kwargs):
            raise AttributeError("No constructor defined")
        __repr__ = _swig_repr
        __swig_destroy__ = _xapian.delete_RuntimeError
    RuntimeError_swigregister = _xapian.RuntimeError_swigregister
    RuntimeError_swigregister(RuntimeError)

    class AssertionError(LogicError):
        """

        AssertionError is thrown if a logical assertion inside Xapian fails.

        In a debug build of Xapian, a failed assertion in the core library
        code will cause AssertionError to be thrown.

        This represents a bug in Xapian (either an invariant, precondition,
        etc has been violated, or the assertion is incorrect!)
        """

        __swig_setmethods__ = {}
        for _s in [LogicError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, AssertionError, name, value)
        __swig_getmethods__ = {}
        for _s in [LogicError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, AssertionError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::AssertionError::AssertionError(const std::string &msg_, int
            errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.AssertionError_swiginit(self, _xapian.new_AssertionError(*args))
        __swig_destroy__ = _xapian.delete_AssertionError
    AssertionError_swigregister = _xapian.AssertionError_swigregister
    AssertionError_swigregister(AssertionError)

    class InvalidArgumentError(LogicError):
        """

        InvalidArgumentError indicates an invalid parameter value was passed
        to the API.
        """

        __swig_setmethods__ = {}
        for _s in [LogicError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, InvalidArgumentError, name, value)
        __swig_getmethods__ = {}
        for _s in [LogicError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, InvalidArgumentError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::InvalidArgumentError::InvalidArgumentError(const std::string
            &msg_, int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.InvalidArgumentError_swiginit(self, _xapian.new_InvalidArgumentError(*args))
        __swig_destroy__ = _xapian.delete_InvalidArgumentError
    InvalidArgumentError_swigregister = _xapian.InvalidArgumentError_swigregister
    InvalidArgumentError_swigregister(InvalidArgumentError)

    class InvalidOperationError(LogicError):
        """

        InvalidOperationError indicates the API was used in an invalid way.
        """

        __swig_setmethods__ = {}
        for _s in [LogicError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, InvalidOperationError, name, value)
        __swig_getmethods__ = {}
        for _s in [LogicError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, InvalidOperationError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::InvalidOperationError::InvalidOperationError(const std::string
            &msg_, int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.InvalidOperationError_swiginit(self, _xapian.new_InvalidOperationError(*args))
        __swig_destroy__ = _xapian.delete_InvalidOperationError
    InvalidOperationError_swigregister = _xapian.InvalidOperationError_swigregister
    InvalidOperationError_swigregister(InvalidOperationError)

    class UnimplementedError(LogicError):
        """

        UnimplementedError indicates an attempt to use an unimplemented
        feature.
        """

        __swig_setmethods__ = {}
        for _s in [LogicError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, UnimplementedError, name, value)
        __swig_getmethods__ = {}
        for _s in [LogicError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, UnimplementedError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::UnimplementedError::UnimplementedError(const std::string
            &msg_, int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.UnimplementedError_swiginit(self, _xapian.new_UnimplementedError(*args))
        __swig_destroy__ = _xapian.delete_UnimplementedError
    UnimplementedError_swigregister = _xapian.UnimplementedError_swigregister
    UnimplementedError_swigregister(UnimplementedError)

    class DatabaseError(RuntimeError):
        """

        DatabaseError indicates some sort of database related error.
        """

        __swig_setmethods__ = {}
        for _s in [RuntimeError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, DatabaseError, name, value)
        __swig_getmethods__ = {}
        for _s in [RuntimeError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, DatabaseError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::DatabaseError::DatabaseError(const std::string &msg_, int
            errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseError_swiginit(self, _xapian.new_DatabaseError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseError
    DatabaseError_swigregister = _xapian.DatabaseError_swigregister
    DatabaseError_swigregister(DatabaseError)

    class DatabaseCorruptError(DatabaseError):
        """

        DatabaseCorruptError indicates database corruption was detected.
        """

        __swig_setmethods__ = {}
        for _s in [DatabaseError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, DatabaseCorruptError, name, value)
        __swig_getmethods__ = {}
        for _s in [DatabaseError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, DatabaseCorruptError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::DatabaseCorruptError::DatabaseCorruptError(const std::string
            &msg_, int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseCorruptError_swiginit(self, _xapian.new_DatabaseCorruptError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseCorruptError
    DatabaseCorruptError_swigregister = _xapian.DatabaseCorruptError_swigregister
    DatabaseCorruptError_swigregister(DatabaseCorruptError)

    class DatabaseCreateError(DatabaseError):
        """

        DatabaseCreateError indicates a failure to create a database.
        """

        __swig_setmethods__ = {}
        for _s in [DatabaseError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, DatabaseCreateError, name, value)
        __swig_getmethods__ = {}
        for _s in [DatabaseError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, DatabaseCreateError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::DatabaseCreateError::DatabaseCreateError(const std::string
            &msg_, int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseCreateError_swiginit(self, _xapian.new_DatabaseCreateError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseCreateError
    DatabaseCreateError_swigregister = _xapian.DatabaseCreateError_swigregister
    DatabaseCreateError_swigregister(DatabaseCreateError)

    class DatabaseLockError(DatabaseError):
        """

        DatabaseLockError indicates failure to lock a database.
        """

        __swig_setmethods__ = {}
        for _s in [DatabaseError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, DatabaseLockError, name, value)
        __swig_getmethods__ = {}
        for _s in [DatabaseError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, DatabaseLockError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::DatabaseLockError::DatabaseLockError(const std::string &msg_,
            int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseLockError_swiginit(self, _xapian.new_DatabaseLockError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseLockError
    DatabaseLockError_swigregister = _xapian.DatabaseLockError_swigregister
    DatabaseLockError_swigregister(DatabaseLockError)

    class DatabaseModifiedError(DatabaseError):
        """

        DatabaseModifiedError indicates a database was modified.

        To recover after catching this error, you need to call
        Xapian::Database::reopen() on the Database and repeat the operation
        which failed.
        """

        __swig_setmethods__ = {}
        for _s in [DatabaseError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, DatabaseModifiedError, name, value)
        __swig_getmethods__ = {}
        for _s in [DatabaseError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, DatabaseModifiedError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::DatabaseModifiedError::DatabaseModifiedError(const std::string
            &msg_, int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseModifiedError_swiginit(self, _xapian.new_DatabaseModifiedError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseModifiedError
    DatabaseModifiedError_swigregister = _xapian.DatabaseModifiedError_swigregister
    DatabaseModifiedError_swigregister(DatabaseModifiedError)

    class DatabaseOpeningError(DatabaseError):
        """

        DatabaseOpeningError indicates failure to open a database.
        """

        __swig_setmethods__ = {}
        for _s in [DatabaseError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, DatabaseOpeningError, name, value)
        __swig_getmethods__ = {}
        for _s in [DatabaseError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, DatabaseOpeningError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::DatabaseOpeningError::DatabaseOpeningError(const std::string
            &msg_, int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseOpeningError_swiginit(self, _xapian.new_DatabaseOpeningError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseOpeningError
    DatabaseOpeningError_swigregister = _xapian.DatabaseOpeningError_swigregister
    DatabaseOpeningError_swigregister(DatabaseOpeningError)

    class DatabaseVersionError(DatabaseOpeningError):
        """

        DatabaseVersionError indicates that a database is in an unsupported
        format.

        From time to time, new versions of Xapian will require the database
        format to be changed, to allow new information to be stored or new
        optimisations to be performed. Backwards compatibility will sometimes
        be maintained, so that new versions of Xapian can open old databases,
        but in some cases Xapian will be unable to open a database because it
        is in too old (or new) a format. This can be resolved either be
        upgrading or downgrading the version of Xapian in use, or by
        rebuilding the database from scratch with the current version of
        Xapian.
        """

        __swig_setmethods__ = {}
        for _s in [DatabaseOpeningError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, DatabaseVersionError, name, value)
        __swig_getmethods__ = {}
        for _s in [DatabaseOpeningError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, DatabaseVersionError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::DatabaseVersionError::DatabaseVersionError(const std::string
            &msg_, int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseVersionError_swiginit(self, _xapian.new_DatabaseVersionError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseVersionError
    DatabaseVersionError_swigregister = _xapian.DatabaseVersionError_swigregister
    DatabaseVersionError_swigregister(DatabaseVersionError)

    class DocNotFoundError(RuntimeError):
        """

        Indicates an attempt to access a document not present in the database.

        """

        __swig_setmethods__ = {}
        for _s in [RuntimeError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, DocNotFoundError, name, value)
        __swig_getmethods__ = {}
        for _s in [RuntimeError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, DocNotFoundError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::DocNotFoundError::DocNotFoundError(const std::string &msg_,
            int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DocNotFoundError_swiginit(self, _xapian.new_DocNotFoundError(*args))
        __swig_destroy__ = _xapian.delete_DocNotFoundError
    DocNotFoundError_swigregister = _xapian.DocNotFoundError_swigregister
    DocNotFoundError_swigregister(DocNotFoundError)

    class FeatureUnavailableError(RuntimeError):
        """

        Indicates an attempt to use a feature which is unavailable.

        Typically a feature is unavailable because it wasn't compiled in, or
        because it requires other software or facilities which aren't
        available.
        """

        __swig_setmethods__ = {}
        for _s in [RuntimeError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, FeatureUnavailableError, name, value)
        __swig_getmethods__ = {}
        for _s in [RuntimeError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, FeatureUnavailableError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::FeatureUnavailableError::FeatureUnavailableError(const
            std::string &msg_, int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.FeatureUnavailableError_swiginit(self, _xapian.new_FeatureUnavailableError(*args))
        __swig_destroy__ = _xapian.delete_FeatureUnavailableError
    FeatureUnavailableError_swigregister = _xapian.FeatureUnavailableError_swigregister
    FeatureUnavailableError_swigregister(FeatureUnavailableError)

    class InternalError(RuntimeError):
        """

        InternalError indicates a runtime problem of some sort.
        """

        __swig_setmethods__ = {}
        for _s in [RuntimeError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, InternalError, name, value)
        __swig_getmethods__ = {}
        for _s in [RuntimeError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, InternalError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::InternalError::InternalError(const std::string &msg_, int
            errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.InternalError_swiginit(self, _xapian.new_InternalError(*args))
        __swig_destroy__ = _xapian.delete_InternalError
    InternalError_swigregister = _xapian.InternalError_swigregister
    InternalError_swigregister(InternalError)

    class NetworkError(RuntimeError):
        """

        Indicates a problem communicating with a remote database.
        """

        __swig_setmethods__ = {}
        for _s in [RuntimeError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, NetworkError, name, value)
        __swig_getmethods__ = {}
        for _s in [RuntimeError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, NetworkError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::NetworkError::NetworkError(const std::string &msg_, int
            errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.NetworkError_swiginit(self, _xapian.new_NetworkError(*args))
        __swig_destroy__ = _xapian.delete_NetworkError
    NetworkError_swigregister = _xapian.NetworkError_swigregister
    NetworkError_swigregister(NetworkError)

    class NetworkTimeoutError(NetworkError):
        """

        Indicates a timeout expired while communicating with a remote
        database.
        """

        __swig_setmethods__ = {}
        for _s in [NetworkError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, NetworkTimeoutError, name, value)
        __swig_getmethods__ = {}
        for _s in [NetworkError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, NetworkTimeoutError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::NetworkTimeoutError::NetworkTimeoutError(const std::string
            &msg_, int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.NetworkTimeoutError_swiginit(self, _xapian.new_NetworkTimeoutError(*args))
        __swig_destroy__ = _xapian.delete_NetworkTimeoutError
    NetworkTimeoutError_swigregister = _xapian.NetworkTimeoutError_swigregister
    NetworkTimeoutError_swigregister(NetworkTimeoutError)

    class QueryParserError(RuntimeError):
        """

        Indicates a query string can't be parsed.
        """

        __swig_setmethods__ = {}
        for _s in [RuntimeError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, QueryParserError, name, value)
        __swig_getmethods__ = {}
        for _s in [RuntimeError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, QueryParserError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::QueryParserError::QueryParserError(const std::string &msg_,
            int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.QueryParserError_swiginit(self, _xapian.new_QueryParserError(*args))
        __swig_destroy__ = _xapian.delete_QueryParserError
    QueryParserError_swigregister = _xapian.QueryParserError_swigregister
    QueryParserError_swigregister(QueryParserError)

    class SerialisationError(RuntimeError):
        """

        Indicates an error in the std::string serialisation of an object.
        """

        __swig_setmethods__ = {}
        for _s in [RuntimeError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, SerialisationError, name, value)
        __swig_getmethods__ = {}
        for _s in [RuntimeError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, SerialisationError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::SerialisationError::SerialisationError(const std::string
            &msg_, int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.SerialisationError_swiginit(self, _xapian.new_SerialisationError(*args))
        __swig_destroy__ = _xapian.delete_SerialisationError
    SerialisationError_swigregister = _xapian.SerialisationError_swigregister
    SerialisationError_swigregister(SerialisationError)

    class RangeError(RuntimeError):
        """

        RangeError indicates an attempt to access outside the bounds of a
        container.
        """

        __swig_setmethods__ = {}
        for _s in [RuntimeError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, RangeError, name, value)
        __swig_getmethods__ = {}
        for _s in [RuntimeError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, RangeError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::RangeError::RangeError(const std::string &msg_, int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.RangeError_swiginit(self, _xapian.new_RangeError(*args))
        __swig_destroy__ = _xapian.delete_RangeError
    RangeError_swigregister = _xapian.RangeError_swigregister
    RangeError_swigregister(RangeError)

    class WildcardError(RuntimeError):
        """

        WildcardError indicates an error expanding a wildcarded query.
        """

        __swig_setmethods__ = {}
        for _s in [RuntimeError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, WildcardError, name, value)
        __swig_getmethods__ = {}
        for _s in [RuntimeError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, WildcardError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::WildcardError::WildcardError(const std::string &msg_, int
            errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.WildcardError_swiginit(self, _xapian.new_WildcardError(*args))
        __swig_destroy__ = _xapian.delete_WildcardError
    WildcardError_swigregister = _xapian.WildcardError_swigregister
    WildcardError_swigregister(WildcardError)

    class DatabaseNotFoundError(DatabaseOpeningError):
        """

        Indicates an attempt to access a database not present.
        """

        __swig_setmethods__ = {}
        for _s in [DatabaseOpeningError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, DatabaseNotFoundError, name, value)
        __swig_getmethods__ = {}
        for _s in [DatabaseOpeningError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, DatabaseNotFoundError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::DatabaseNotFoundError::DatabaseNotFoundError(const std::string
            &msg_, int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseNotFoundError_swiginit(self, _xapian.new_DatabaseNotFoundError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseNotFoundError
    DatabaseNotFoundError_swigregister = _xapian.DatabaseNotFoundError_swigregister
    DatabaseNotFoundError_swigregister(DatabaseNotFoundError)

    class DatabaseClosedError(DatabaseError):
        """

        Indicates an attempt to access a closed database.
        """

        __swig_setmethods__ = {}
        for _s in [DatabaseError]:
            __swig_setmethods__.update(getattr(_s, '__swig_setmethods__', {}))
        __setattr__ = lambda self, name, value: _swig_setattr(self, DatabaseClosedError, name, value)
        __swig_getmethods__ = {}
        for _s in [DatabaseError]:
            __swig_getmethods__.update(getattr(_s, '__swig_getmethods__', {}))
        __getattr__ = lambda self, name: _swig_getattr(self, DatabaseClosedError, name)
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct from message and errno value.

            Xapian::DatabaseClosedError::DatabaseClosedError(const std::string
            &msg_, int errno_)

            Parameters:
            -----------

            msg_:  Message giving details of the error, intended for human
            consumption.

            errno_:  Optional errno value associated with this error.
            """
            _xapian.DatabaseClosedError_swiginit(self, _xapian.new_DatabaseClosedError(*args))
        __swig_destroy__ = _xapian.delete_DatabaseClosedError
    DatabaseClosedError_swigregister = _xapian.DatabaseClosedError_swigregister
    DatabaseClosedError_swigregister(DatabaseClosedError)

    def version_string():
        return _xapian.version_string()
    version_string = _xapian.version_string

    def major_version():
        return _xapian.major_version()
    major_version = _xapian.major_version

    def minor_version():
        return _xapian.minor_version()
    minor_version = _xapian.minor_version

    def revision():
        return _xapian.revision()
    revision = _xapian.revision
    BAD_VALUENO = _xapian.BAD_VALUENO
    DB_CREATE = _xapian.DB_CREATE
    DB_CREATE_OR_OPEN = _xapian.DB_CREATE_OR_OPEN
    DB_CREATE_OR_OVERWRITE = _xapian.DB_CREATE_OR_OVERWRITE
    DB_OPEN = _xapian.DB_OPEN
    DB_NO_SYNC = _xapian.DB_NO_SYNC
    DB_FULL_SYNC = _xapian.DB_FULL_SYNC
    DB_DANGEROUS = _xapian.DB_DANGEROUS
    DB_NO_TERMLIST = _xapian.DB_NO_TERMLIST
    DB_BACKEND_CHERT = _xapian.DB_BACKEND_CHERT
    DB_BACKEND_GLASS = _xapian.DB_BACKEND_GLASS
    DB_BACKEND_INMEMORY = _xapian.DB_BACKEND_INMEMORY
    DB_BACKEND_STUB = _xapian.DB_BACKEND_STUB
    DB_RETRY_LOCK = _xapian.DB_RETRY_LOCK
    DBCHECK_SHORT_TREE = _xapian.DBCHECK_SHORT_TREE
    DBCHECK_FULL_TREE = _xapian.DBCHECK_FULL_TREE
    DBCHECK_SHOW_FREELIST = _xapian.DBCHECK_SHOW_FREELIST
    DBCHECK_SHOW_STATS = _xapian.DBCHECK_SHOW_STATS
    DBCHECK_FIX = _xapian.DBCHECK_FIX
    DBCOMPACT_MULTIPASS = _xapian.DBCOMPACT_MULTIPASS
    DBCOMPACT_NO_RENUMBER = _xapian.DBCOMPACT_NO_RENUMBER
    DBCOMPACT_SINGLE_FILE = _xapian.DBCOMPACT_SINGLE_FILE
    DOC_ASSUME_VALID = _xapian.DOC_ASSUME_VALID
    class _PositionIterator(object):
        """

        Class for iterating over term positions.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor.

            Xapian::PositionIterator::PositionIterator()

            Creates an uninitialised iterator, which can't be used before being
            assigned to, but is sometimes syntactically convenient.
            """
            _xapian._PositionIterator_swiginit(self, _xapian.new__PositionIterator())
        __swig_destroy__ = _xapian.delete__PositionIterator

        def skip_to(self, termpos):
            """

            Advance the iterator to term position termpos.

            void Xapian::PositionIterator::skip_to(Xapian::termpos termpos)

            Parameters:
            -----------

            termpos:  The position to advance to. If this position isn't in the
            stream being iterated, then the iterator is moved to the next term
            position after it which is.
            """
            return _xapian._PositionIterator_skip_to(self, termpos)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::PositionIterator::get_description() const
            """
            return _xapian._PositionIterator___str__(self)

    _PositionIterator.skip_to = new_instancemethod(_xapian._PositionIterator_skip_to, None, _PositionIterator)
    _PositionIterator.__str__ = new_instancemethod(_xapian._PositionIterator___str__, None, _PositionIterator)
    _PositionIterator.__eq__ = new_instancemethod(_xapian._PositionIterator___eq__, None, _PositionIterator)
    _PositionIterator.__ne__ = new_instancemethod(_xapian._PositionIterator___ne__, None, _PositionIterator)
    _PositionIterator.equals = new_instancemethod(_xapian._PositionIterator_equals, None, _PositionIterator)
    _PositionIterator.get_termpos = new_instancemethod(_xapian._PositionIterator_get_termpos, None, _PositionIterator)
    _PositionIterator.next = new_instancemethod(_xapian._PositionIterator_next, None, _PositionIterator)
    _PositionIterator_swigregister = _xapian._PositionIterator_swigregister
    _PositionIterator_swigregister(_PositionIterator)

    class _PostingIterator(object):
        """

        Class for iterating over a list of terms.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor.

            Xapian::PostingIterator::PostingIterator()

            Creates an uninitialised iterator, which can't be used before being
            assigned to, but is sometimes syntactically convenient.
            """
            _xapian._PostingIterator_swiginit(self, _xapian.new__PostingIterator())
        __swig_destroy__ = _xapian.delete__PostingIterator

        def get_wdf(self):
            """

            Return the wdf for the document at the current position.

            Xapian::termcount Xapian::PostingIterator::get_wdf() const
            """
            return _xapian._PostingIterator_get_wdf(self)

        def get_doclength(self):
            """

            Return the length of the document at the current position.

            Xapian::termcount Xapian::PostingIterator::get_doclength() const
            """
            return _xapian._PostingIterator_get_doclength(self)

        def get_unique_terms(self):
            """

            Return the number of unique terms in the current document.

            Xapian::termcount Xapian::PostingIterator::get_unique_terms() const
            """
            return _xapian._PostingIterator_get_unique_terms(self)

        def _positionlist_begin(self):
            """

            Return a PositionIterator for the current document.

            PositionIterator Xapian::PostingIterator::positionlist_begin() const

            """
            return _xapian._PostingIterator__positionlist_begin(self)

        def _positionlist_end(self):
            """

            Return an end PositionIterator for the current document.

            PositionIterator Xapian::PostingIterator::positionlist_end() const
            """
            return _xapian._PostingIterator__positionlist_end(self)

        def skip_to(self, did):
            """

            Advance the iterator to document did.

            void Xapian::PostingIterator::skip_to(Xapian::docid did)

            Parameters:
            -----------

            did:  The document id to advance to. If this document id isn't in the
            stream being iterated, then the iterator is moved to the next document
            id after it which is.
            """
            return _xapian._PostingIterator_skip_to(self, did)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::PostingIterator::get_description() const
            """
            return _xapian._PostingIterator___str__(self)

    _PostingIterator.get_wdf = new_instancemethod(_xapian._PostingIterator_get_wdf, None, _PostingIterator)
    _PostingIterator.get_doclength = new_instancemethod(_xapian._PostingIterator_get_doclength, None, _PostingIterator)
    _PostingIterator.get_unique_terms = new_instancemethod(_xapian._PostingIterator_get_unique_terms, None, _PostingIterator)
    _PostingIterator._positionlist_begin = new_instancemethod(_xapian._PostingIterator__positionlist_begin, None, _PostingIterator)
    _PostingIterator._positionlist_end = new_instancemethod(_xapian._PostingIterator__positionlist_end, None, _PostingIterator)
    _PostingIterator.skip_to = new_instancemethod(_xapian._PostingIterator_skip_to, None, _PostingIterator)
    _PostingIterator.__str__ = new_instancemethod(_xapian._PostingIterator___str__, None, _PostingIterator)
    _PostingIterator.__eq__ = new_instancemethod(_xapian._PostingIterator___eq__, None, _PostingIterator)
    _PostingIterator.__ne__ = new_instancemethod(_xapian._PostingIterator___ne__, None, _PostingIterator)
    _PostingIterator.equals = new_instancemethod(_xapian._PostingIterator_equals, None, _PostingIterator)
    _PostingIterator.get_docid = new_instancemethod(_xapian._PostingIterator_get_docid, None, _PostingIterator)
    _PostingIterator.next = new_instancemethod(_xapian._PostingIterator_next, None, _PostingIterator)
    _PostingIterator_swigregister = _xapian._PostingIterator_swigregister
    _PostingIterator_swigregister(_PostingIterator)

    class _TermIterator(object):
        """

        Class for iterating over a list of terms.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor.

            Xapian::TermIterator::TermIterator()

            Creates an uninitialised iterator, which can't be used before being
            assigned to, but is sometimes syntactically convenient.
            """
            _xapian._TermIterator_swiginit(self, _xapian.new__TermIterator())
        __swig_destroy__ = _xapian.delete__TermIterator

        def get_wdf(self):
            """

            Return the wdf for the term at the current position.

            Xapian::termcount Xapian::TermIterator::get_wdf() const
            """
            return _xapian._TermIterator_get_wdf(self)

        def get_termfreq(self):
            """

            Return the term frequency for the term at the current position.

            Xapian::doccount Xapian::TermIterator::get_termfreq() const
            """
            return _xapian._TermIterator_get_termfreq(self)

        def positionlist_count(self):
            """

            Return the length of the position list for the current position.

            Xapian::termcount Xapian::TermIterator::positionlist_count() const
            """
            return _xapian._TermIterator_positionlist_count(self)

        def _positionlist_begin(self):
            """

            Return a PositionIterator for the current term.

            PositionIterator Xapian::TermIterator::positionlist_begin() const
            """
            return _xapian._TermIterator__positionlist_begin(self)

        def _positionlist_end(self):
            """

            Return an end PositionIterator for the current term.

            PositionIterator Xapian::TermIterator::positionlist_end() const
            """
            return _xapian._TermIterator__positionlist_end(self)

        def skip_to(self, term):
            """

            Advance the iterator to term term.

            void Xapian::TermIterator::skip_to(const std::string &term)

            If the iteration is over an unsorted list of terms, then this method
            will throw Xapian::InvalidOperationError.

            Parameters:
            -----------

            term:  The term to advance to. If this term isn't in the stream being
            iterated, then the iterator is moved to the next term after it which
            is.
            """
            return _xapian._TermIterator_skip_to(self, term)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::TermIterator::get_description() const
            """
            return _xapian._TermIterator___str__(self)

    _TermIterator.get_wdf = new_instancemethod(_xapian._TermIterator_get_wdf, None, _TermIterator)
    _TermIterator.get_termfreq = new_instancemethod(_xapian._TermIterator_get_termfreq, None, _TermIterator)
    _TermIterator.positionlist_count = new_instancemethod(_xapian._TermIterator_positionlist_count, None, _TermIterator)
    _TermIterator._positionlist_begin = new_instancemethod(_xapian._TermIterator__positionlist_begin, None, _TermIterator)
    _TermIterator._positionlist_end = new_instancemethod(_xapian._TermIterator__positionlist_end, None, _TermIterator)
    _TermIterator.skip_to = new_instancemethod(_xapian._TermIterator_skip_to, None, _TermIterator)
    _TermIterator.__str__ = new_instancemethod(_xapian._TermIterator___str__, None, _TermIterator)
    _TermIterator.__eq__ = new_instancemethod(_xapian._TermIterator___eq__, None, _TermIterator)
    _TermIterator.__ne__ = new_instancemethod(_xapian._TermIterator___ne__, None, _TermIterator)
    _TermIterator.equals = new_instancemethod(_xapian._TermIterator_equals, None, _TermIterator)
    _TermIterator.get_term = new_instancemethod(_xapian._TermIterator_get_term, None, _TermIterator)
    _TermIterator.next = new_instancemethod(_xapian._TermIterator_next, None, _TermIterator)
    _TermIterator_swigregister = _xapian._TermIterator_swigregister
    _TermIterator_swigregister(_TermIterator)

    class _ValueIterator(object):
        """

        Class for iterating over document values.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor.

            Xapian::ValueIterator::ValueIterator()

            Creates an uninitialised iterator, which can't be used before being
            assigned to, but is sometimes syntactically convenient.
            """
            _xapian._ValueIterator_swiginit(self, _xapian.new__ValueIterator())
        __swig_destroy__ = _xapian.delete__ValueIterator

        def get_docid(self):
            """

            Return the docid at the current position.

            Xapian::docid Xapian::ValueIterator::get_docid() const

            If we're iterating over values of a document, this method will throw
            Xapian::InvalidOperationError.
            """
            return _xapian._ValueIterator_get_docid(self)

        def get_valueno(self):
            """

            Return the value slot number for the current position.

            Xapian::valueno Xapian::ValueIterator::get_valueno() const

            If the iterator is over all values in a slot, this returns that slot's
            number. If the iterator is over the values in a particular document,
            it returns the number of each slot in turn.
            """
            return _xapian._ValueIterator_get_valueno(self)

        def skip_to(self, docid_or_slot):
            """

            Advance the iterator to document id or value slot docid_or_slot.

            void Xapian::ValueIterator::skip_to(Xapian::docid docid_or_slot)

            If this iterator is over values in a document, then this method
            advances the iterator to value slot docid_or_slot, or the first slot
            after it if there is no value in slot slot.

            If this iterator is over values in a particular slot, then this method
            advances the iterator to document id docid_or_slot, or the first
            document id after it if there is no value in the slot we're iterating
            over for document docid_or_slot.

            Note: The "two-faced" nature of this method is due to how C++
            overloading works. Xapian::docid and Xapian::valueno are both typedefs
            for the same unsigned integer type, so overloading can't distinguish
            them.

            Parameters:
            -----------

            docid_or_slot:  The docid/slot to advance to.
            """
            return _xapian._ValueIterator_skip_to(self, docid_or_slot)

        def check(self, docid):
            """

            Check if the specified docid occurs.

            bool Xapian::ValueIterator::check(Xapian::docid docid)

            The caller is required to ensure that the specified document id did
            actually exists in the database.

            This method acts like skip_to() if that can be done at little extra
            cost, in which case it then returns true. This is how chert and glass
            databases behave because they store values in streams which allow for
            an efficient implementation of skip_to().

            Otherwise it simply checks if a particular docid is present. If it is,
            it returns true. If it isn't, it returns false, and leaves the
            position unspecified (and hence the result of calling methods which
            depend on the current position, such as get_docid(), are also
            unspecified). In this state, next() will advance to the first matching
            position after document did, and skip_to() will act as it would if the
            position was the first matching position after document did.

            Currently the inmemory and remote backends behave in the latter way
            because they don't support streamed values and so skip_to() must check
            each document it skips over which is significantly slower.

            Parameters:
            -----------

            docid:  The document id to check.
            """
            return _xapian._ValueIterator_check(self, docid)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::ValueIterator::get_description() const
            """
            return _xapian._ValueIterator___str__(self)

    _ValueIterator.get_docid = new_instancemethod(_xapian._ValueIterator_get_docid, None, _ValueIterator)
    _ValueIterator.get_valueno = new_instancemethod(_xapian._ValueIterator_get_valueno, None, _ValueIterator)
    _ValueIterator.skip_to = new_instancemethod(_xapian._ValueIterator_skip_to, None, _ValueIterator)
    _ValueIterator.check = new_instancemethod(_xapian._ValueIterator_check, None, _ValueIterator)
    _ValueIterator.__str__ = new_instancemethod(_xapian._ValueIterator___str__, None, _ValueIterator)
    _ValueIterator.__eq__ = new_instancemethod(_xapian._ValueIterator___eq__, None, _ValueIterator)
    _ValueIterator.__ne__ = new_instancemethod(_xapian._ValueIterator___ne__, None, _ValueIterator)
    _ValueIterator.equals = new_instancemethod(_xapian._ValueIterator_equals, None, _ValueIterator)
    _ValueIterator.get_value = new_instancemethod(_xapian._ValueIterator_get_value, None, _ValueIterator)
    _ValueIterator.next = new_instancemethod(_xapian._ValueIterator_next, None, _ValueIterator)
    _ValueIterator_swigregister = _xapian._ValueIterator_swigregister
    _ValueIterator_swigregister(_ValueIterator)

    class Document(object):
        """

        A handle representing a document in a Xapian database.

        The Document class fetches information from the database lazily.
        Usually this behaviour isn't visible to users (except for the speed
        benefits), but if the document in the database is modified or deleted,
        then preexisting Document objects may return the old or new versions
        of data (or throw Xapian::DocNotFoundError in the case of deletion).

        Since Database objects work on a snapshot of the database's state, the
        situation above can only happen with a WritableDatabase object, or if
        you call Database::reopen() on a Database object.

        We recommend you avoid designs where this behaviour is an issue, but
        if you need a way to make a non-lazy version of a Document object, you
        can do this like so:doc =
        Xapian::Document::unserialise(doc.serialise());
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Make a new empty Document.

            Xapian::Document::Document()
            """
            _xapian.Document_swiginit(self, _xapian.new_Document())
        __swig_destroy__ = _xapian.delete_Document

        def get_value(self, slot):
            """

            Get value by number.

            std::string Xapian::Document::get_value(Xapian::valueno slot) const

            Returns an empty string if no value with the given number is present
            in the document.

            Parameters:
            -----------

            slot:  The number of the value.
            """
            return _xapian.Document_get_value(self, slot)

        def add_value(self, slot, value):
            """

            Add a new value.

            void Xapian::Document::add_value(Xapian::valueno slot, const
            std::string &value)

            The new value will replace any existing value with the same number (or
            if the new value is empty, it will remove any existing value with the
            same number).

            Parameters:
            -----------

            slot:  The value slot to add the value in.

            value:  The value to set.
            """
            return _xapian.Document_add_value(self, slot, value)

        def remove_value(self, slot):
            """

            Remove any value with the given number.

            void Xapian::Document::remove_value(Xapian::valueno slot)
            """
            return _xapian.Document_remove_value(self, slot)

        def clear_values(self):
            """

            Remove all values associated with the document.

            void Xapian::Document::clear_values()
            """
            return _xapian.Document_clear_values(self)

        def get_data(self):
            """

            Get data stored in the document.

            std::string Xapian::Document::get_data() const

            This is potentially a relatively expensive operation, and shouldn't
            normally be used during the match (e.g. in a PostingSource or match
            decider functor. Put data for use by match deciders in a value
            instead.
            """
            return _xapian.Document_get_data(self)

        def set_data(self, data):
            """

            Set data stored in the document.

            void Xapian::Document::set_data(const std::string &data)

            Xapian treats the data as an opaque blob. It may try to compress it,
            but other than that it will just store it and return it when
            requested.

            Parameters:
            -----------

            data:  The data to store.
            """
            return _xapian.Document_set_data(self, data)

        def add_posting(self, tname, tpos, wdfinc=1):
            """

            Add an occurrence of a term at a particular position.

            void Xapian::Document::add_posting(const std::string &tname,
            Xapian::termpos tpos, Xapian::termcount wdfinc=1)

            Multiple occurrences of the term at the same position are represented
            only once in the positional information, but do increase the wdf.

            If the term is not already in the document, it will be added to it.

            Parameters:
            -----------

            tname:  The name of the term.

            tpos:  The position of the term.

            wdfinc:  The increment that will be applied to the wdf for this term.

            """
            return _xapian.Document_add_posting(self, tname, tpos, wdfinc)

        def add_term(self, tname, wdfinc=1):
            """

            Add a term to the document, without positional information.

            void Xapian::Document::add_term(const std::string &tname,
            Xapian::termcount wdfinc=1)

            Any existing positional information for the term will be left
            unmodified.

            Parameters:
            -----------

            tname:  The name of the term.

            wdfinc:  The increment that will be applied to the wdf for this term
            (default: 1).
            """
            return _xapian.Document_add_term(self, tname, wdfinc)

        def add_boolean_term(self, term):
            """

            Add a boolean filter term to the document.

            void Xapian::Document::add_boolean_term(const std::string &term)

            This method adds term to the document with wdf of 0 - this is
            generally what you want for a term used for boolean filtering as the
            wdf of such terms is ignored, and it doesn't make sense for them to
            contribute to the document's length.

            If the specified term already indexes this document, this method has
            no effect.

            It is exactly the same as add_term(term, 0).

            This method was added in Xapian 1.0.18.

            Parameters:
            -----------

            term:  The term to add.
            """
            return _xapian.Document_add_boolean_term(self, term)

        def remove_posting(self, tname, tpos, wdfdec=1):
            """

            Remove a posting of a term from the document.

            void Xapian::Document::remove_posting(const std::string &tname,
            Xapian::termpos tpos, Xapian::termcount wdfdec=1)

            Note that the term will still index the document even if all
            occurrences are removed. To remove a term from a document completely,
            use remove_term().

            Parameters:
            -----------

            tname:  The name of the term.

            tpos:  The position of the term.

            wdfdec:  The decrement that will be applied to the wdf when removing
            this posting. The wdf will not go below the value of 0.

            Parameters:
            -----------

            Xapian::InvalidArgumentError:  will be thrown if the term is not at
            the position specified in the position list for this term in this
            document.

            Xapian::InvalidArgumentError:  will be thrown if the term is not in
            the document
            """
            return _xapian.Document_remove_posting(self, tname, tpos, wdfdec)

        def remove_postings(self, term, term_pos_first, term_pos_last, wdf_dec=1):
            """

            Remove a range of postings for a term.

            Xapian::termpos Xapian::Document::remove_postings(const std::string
            &term, Xapian::termpos term_pos_first, Xapian::termpos term_pos_last,
            Xapian::termcount wdf_dec=1)

            Any instances of the term at positions >= term_pos_first and <=
            term_pos_last will be removed, and the wdf reduced by wdf_dec for each
            instance removed (the wdf will not ever go below zero though).

            It's OK if the term doesn't occur in the range of positions specified
            (unlike  remove_posting()). And if term_pos_first > term_pos_last,
            this method does nothing.

            The number of postings removed.

            Parameters:
            -----------

            Xapian::InvalidArgumentError:  will be thrown if the term is not in
            the document
            """
            return _xapian.Document_remove_postings(self, term, term_pos_first, term_pos_last, wdf_dec)

        def remove_term(self, tname):
            """

            Remove a term and all postings associated with it.

            void Xapian::Document::remove_term(const std::string &tname)

            Parameters:
            -----------

            tname:  The name of the term.

            Parameters:
            -----------

            Xapian::InvalidArgumentError:  will be thrown if the term is not in
            the document
            """
            return _xapian.Document_remove_term(self, tname)

        def clear_terms(self):
            """

            Remove all terms (and postings) from the document.

            void Xapian::Document::clear_terms()
            """
            return _xapian.Document_clear_terms(self)

        def termlist_count(self):
            """

            The length of the termlist - i.e.

            Xapian::termcount Xapian::Document::termlist_count() const

            the number of different terms which index this document.
            """
            return _xapian.Document_termlist_count(self)

        def _termlist_begin(self):
            """

            Iterator for the terms in this document.

            TermIterator Xapian::Document::termlist_begin() const
            """
            return _xapian.Document__termlist_begin(self)

        def _termlist_end(self):
            """

            Equivalent end iterator for termlist_begin().

            TermIterator Xapian::Document::termlist_end() const
            """
            return _xapian.Document__termlist_end(self)

        def values_count(self):
            """

            Count the values in this document.

            Xapian::termcount Xapian::Document::values_count() const
            """
            return _xapian.Document_values_count(self)

        def _values_begin(self):
            """

            Iterator for the values in this document.

            ValueIterator Xapian::Document::values_begin() const
            """
            return _xapian.Document__values_begin(self)

        def _values_end(self):
            """

            Equivalent end iterator for values_begin().

            ValueIterator Xapian::Document::values_end() const
            """
            return _xapian.Document__values_end(self)

        def get_docid(self):
            """

            Get the document id which is associated with this document (if any).

            docid Xapian::Document::get_docid() const

            NB If multiple databases are being searched together, then this will
            be the document id in the individual database, not the merged
            database!

            If this document came from a database, return the document id in that
            database. Otherwise, return 0 (in Xapian 1.0.22/1.2.4 or later; prior
            to this the returned value was uninitialised).
            """
            return _xapian.Document_get_docid(self)

        def serialise(self):
            """

            Serialise document into a string.

            std::string Xapian::Document::serialise() const

            The document representation may change between Xapian releases: even
            between minor versions. However, it is guaranteed not to change if the
            remote database protocol has not changed between releases.
            """
            return _xapian.Document_serialise(self)

        unserialise = staticmethod(_xapian.Document_unserialise)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::Document::get_description() const
            """
            return _xapian.Document___str__(self)

    Document.get_value = new_instancemethod(_xapian.Document_get_value, None, Document)
    Document.add_value = new_instancemethod(_xapian.Document_add_value, None, Document)
    Document.remove_value = new_instancemethod(_xapian.Document_remove_value, None, Document)
    Document.clear_values = new_instancemethod(_xapian.Document_clear_values, None, Document)
    Document.get_data = new_instancemethod(_xapian.Document_get_data, None, Document)
    Document.set_data = new_instancemethod(_xapian.Document_set_data, None, Document)
    Document.add_posting = new_instancemethod(_xapian.Document_add_posting, None, Document)
    Document.add_term = new_instancemethod(_xapian.Document_add_term, None, Document)
    Document.add_boolean_term = new_instancemethod(_xapian.Document_add_boolean_term, None, Document)
    Document.remove_posting = new_instancemethod(_xapian.Document_remove_posting, None, Document)
    Document.remove_postings = new_instancemethod(_xapian.Document_remove_postings, None, Document)
    Document.remove_term = new_instancemethod(_xapian.Document_remove_term, None, Document)
    Document.clear_terms = new_instancemethod(_xapian.Document_clear_terms, None, Document)
    Document.termlist_count = new_instancemethod(_xapian.Document_termlist_count, None, Document)
    Document._termlist_begin = new_instancemethod(_xapian.Document__termlist_begin, None, Document)
    Document._termlist_end = new_instancemethod(_xapian.Document__termlist_end, None, Document)
    Document.values_count = new_instancemethod(_xapian.Document_values_count, None, Document)
    Document._values_begin = new_instancemethod(_xapian.Document__values_begin, None, Document)
    Document._values_end = new_instancemethod(_xapian.Document__values_end, None, Document)
    Document.get_docid = new_instancemethod(_xapian.Document_get_docid, None, Document)
    Document.serialise = new_instancemethod(_xapian.Document_serialise, None, Document)
    Document.__str__ = new_instancemethod(_xapian.Document___str__, None, Document)
    Document_swigregister = _xapian.Document_swigregister
    Document_swigregister(Document)

    def Document_unserialise(serialised):
        return _xapian.Document_unserialise(serialised)
    Document_unserialise = _xapian.Document_unserialise

    class Registry(object):
        """

        Registry for user subclasses.

        This class provides a way for the remote server to look up user
        subclasses when unserialising.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor.

            Xapian::Registry::Registry()

            The registry will contain all standard subclasses of user-subclassable
            classes.
            """
            _xapian.Registry_swiginit(self, _xapian.new_Registry())
        __swig_destroy__ = _xapian.delete_Registry

        def register_weighting_scheme(self, wt):
            """

            Register a weighting scheme.

            void Xapian::Registry::register_weighting_scheme(const Xapian::Weight
            &wt)

            Parameters:
            -----------

            wt:  The weighting scheme to register.
            """
            return _xapian.Registry_register_weighting_scheme(self, wt)

        def get_weighting_scheme(self, name):
            """

            Get the weighting scheme given a name.

            const Xapian::Weight* Xapian::Registry::get_weighting_scheme(const
            std::string &name) const

            Parameters:
            -----------

            name:  The name of the weighting scheme to find.

            An object with the requested name, or NULL if the weighting scheme
            could not be found. The returned object is owned by the registry and
            so must not be deleted by the caller.
            """
            return _xapian.Registry_get_weighting_scheme(self, name)

        def register_posting_source(self, source):
            """

            Register a user-defined posting source class.

            void Xapian::Registry::register_posting_source(const
            Xapian::PostingSource &source)

            Parameters:
            -----------

            source:  The posting source to register.
            """
            return _xapian.Registry_register_posting_source(self, source)

        def get_posting_source(self, name):
            """

            Get a posting source given a name.

            const Xapian::PostingSource*
            Xapian::Registry::get_posting_source(const std::string &name) const

            Parameters:
            -----------

            name:  The name of the posting source to find.

            An object with the requested name, or NULL if the posting source could
            not be found. The returned object is owned by the registry and so must
            not be deleted by the caller.
            """
            return _xapian.Registry_get_posting_source(self, name)

        def register_match_spy(self, spy):
            """

            Register a user-defined match spy class.

            void Xapian::Registry::register_match_spy(const Xapian::MatchSpy &spy)

            Parameters:
            -----------

            spy:  The match spy to register.
            """
            return _xapian.Registry_register_match_spy(self, spy)

        def get_match_spy(self, name):
            """

            Get a match spy given a name.

            const Xapian::MatchSpy* Xapian::Registry::get_match_spy(const
            std::string &name) const

            Parameters:
            -----------

            name:  The name of the match spy to find.

            An object with the requested name, or NULL if the match spy could not
            be found. The returned object is owned by the registry and so must not
            be deleted by the caller.
            """
            return _xapian.Registry_get_match_spy(self, name)

        def register_lat_long_metric(self, metric):
            """

            Register a user-defined lat-long metric class.

            void Xapian::Registry::register_lat_long_metric(const
            Xapian::LatLongMetric &metric)
            """
            return _xapian.Registry_register_lat_long_metric(self, metric)

        def get_lat_long_metric(self, name):
            """

            Get a lat-long metric given a name.

            const Xapian::LatLongMetric*
            Xapian::Registry::get_lat_long_metric(const std::string &name) const

            The returned metric is owned by the registry object.

            Returns NULL if the metric could not be found.
            """
            return _xapian.Registry_get_lat_long_metric(self, name)

    Registry.register_weighting_scheme = new_instancemethod(_xapian.Registry_register_weighting_scheme, None, Registry)
    Registry.get_weighting_scheme = new_instancemethod(_xapian.Registry_get_weighting_scheme, None, Registry)
    Registry.register_posting_source = new_instancemethod(_xapian.Registry_register_posting_source, None, Registry)
    Registry.get_posting_source = new_instancemethod(_xapian.Registry_get_posting_source, None, Registry)
    Registry.register_match_spy = new_instancemethod(_xapian.Registry_register_match_spy, None, Registry)
    Registry.get_match_spy = new_instancemethod(_xapian.Registry_get_match_spy, None, Registry)
    Registry.register_lat_long_metric = new_instancemethod(_xapian.Registry_register_lat_long_metric, None, Registry)
    Registry.get_lat_long_metric = new_instancemethod(_xapian.Registry_get_lat_long_metric, None, Registry)
    Registry_swigregister = _xapian.Registry_swigregister
    Registry_swigregister(Registry)

    class Query(object):
        """

        Class representing a query.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr
        OP_AND = _xapian.Query_OP_AND
        OP_OR = _xapian.Query_OP_OR
        OP_AND_NOT = _xapian.Query_OP_AND_NOT
        OP_XOR = _xapian.Query_OP_XOR
        OP_AND_MAYBE = _xapian.Query_OP_AND_MAYBE
        OP_FILTER = _xapian.Query_OP_FILTER
        OP_NEAR = _xapian.Query_OP_NEAR
        OP_PHRASE = _xapian.Query_OP_PHRASE
        OP_VALUE_RANGE = _xapian.Query_OP_VALUE_RANGE
        OP_SCALE_WEIGHT = _xapian.Query_OP_SCALE_WEIGHT
        OP_ELITE_SET = _xapian.Query_OP_ELITE_SET
        OP_VALUE_GE = _xapian.Query_OP_VALUE_GE
        OP_VALUE_LE = _xapian.Query_OP_VALUE_LE
        OP_SYNONYM = _xapian.Query_OP_SYNONYM
        OP_MAX = _xapian.Query_OP_MAX
        OP_WILDCARD = _xapian.Query_OP_WILDCARD
        OP_INVALID = _xapian.Query_OP_INVALID
        WILDCARD_LIMIT_ERROR = _xapian.Query_WILDCARD_LIMIT_ERROR
        WILDCARD_LIMIT_FIRST = _xapian.Query_WILDCARD_LIMIT_FIRST
        WILDCARD_LIMIT_MOST_FREQUENT = _xapian.Query_WILDCARD_LIMIT_MOST_FREQUENT
        __swig_destroy__ = _xapian.delete_Query

        def _get_terms_begin(self):
            """

            Begin iterator for terms in the query object.

            const TermIterator Xapian::Query::get_terms_begin() const

            The iterator returns terms in ascending query position order, and will
            return the same term in each unique position it occurs in. If you want
            the terms in sorted order and without duplicates, see
            get_unique_terms_begin().
            """
            return _xapian.Query__get_terms_begin(self)

        def _get_terms_end(self):
            """

            End iterator for terms in the query object.

            const TermIterator Xapian::Query::get_terms_end() const
            """
            return _xapian.Query__get_terms_end(self)

        def get_unique_terms_begin(self):
            """

            Begin iterator for unique terms in the query object.

            const TermIterator Xapian::Query::get_unique_terms_begin() const

            Terms are sorted and terms with the same name removed from the list.

            If you want the terms in ascending query position order, see
            get_terms_begin().
            """
            return _xapian.Query_get_unique_terms_begin(self)

        def get_length(self):
            """

            Return the length of this query object.

            Xapian::termcount Xapian::Query::get_length() const
            """
            return _xapian.Query_get_length(self)

        def empty(self):
            """

            Check if this query is Xapian::Query::MatchNothing.

            bool Xapian::Query::empty() const
            """
            return _xapian.Query_empty(self)

        def serialise(self):
            """

            Serialise this object into a string.

            std::string Xapian::Query::serialise() const
            """
            return _xapian.Query_serialise(self)

        unserialise = staticmethod(_xapian.Query_unserialise)

        def get_type(self):
            """

            Get the type of the top level of the query.

            op Xapian::Query::get_type() const
            """
            return _xapian.Query_get_type(self)

        def get_num_subqueries(self):
            """

            Get the number of subqueries of the top level query.

            size_t Xapian::Query::get_num_subqueries() const
            """
            return _xapian.Query_get_num_subqueries(self)

        def get_subquery(self, n):
            """

            Read a top level subquery.

            const Query Xapian::Query::get_subquery(size_t n) const

            Parameters:
            -----------

            n:  Return the n-th subquery (starting from 0) - only valid when 0 <=
            n < get_num_subqueries().
            """
            return _xapian.Query_get_subquery(self, n)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::Query::get_description() const
            """
            return _xapian.Query___str__(self)

        def __init__(self, *args):
            """

            Construct with just an operator.

            Xapian::Query::Query(Query::op op_)

            Parameters:
            -----------

            op_:  The operator to use - currently only OP_INVALID is useful.
            """
            _xapian.Query_swiginit(self, _xapian.new_Query(*args))
    Query._get_terms_begin = new_instancemethod(_xapian.Query__get_terms_begin, None, Query)
    Query._get_terms_end = new_instancemethod(_xapian.Query__get_terms_end, None, Query)
    Query.get_unique_terms_begin = new_instancemethod(_xapian.Query_get_unique_terms_begin, None, Query)
    Query.get_length = new_instancemethod(_xapian.Query_get_length, None, Query)
    Query.empty = new_instancemethod(_xapian.Query_empty, None, Query)
    Query.serialise = new_instancemethod(_xapian.Query_serialise, None, Query)
    Query.get_type = new_instancemethod(_xapian.Query_get_type, None, Query)
    Query.get_num_subqueries = new_instancemethod(_xapian.Query_get_num_subqueries, None, Query)
    Query.get_subquery = new_instancemethod(_xapian.Query_get_subquery, None, Query)
    Query.__str__ = new_instancemethod(_xapian.Query___str__, None, Query)
    Query_swigregister = _xapian.Query_swigregister
    Query_swigregister(Query)

    def Query_unserialise(*args):
        return _xapian.Query_unserialise(*args)
    Query_unserialise = _xapian.Query_unserialise

    def __or__(a, b):
        return _xapian.__or__(a, b)
    __or__ = _xapian.__or__

    def __xor__(a, b):
        return _xapian.__xor__(a, b)
    __xor__ = _xapian.__xor__

    def __mul__(*args):
        return _xapian.__mul__(*args)
    __mul__ = _xapian.__mul__

    def __truediv__(q, factor):
        return _xapian.__truediv__(q, factor)
    __truediv__ = _xapian.__truediv__

    def __and__(*args):
        return _xapian.__and__(*args)
    __and__ = _xapian.__and__
    class StemImplementation(object):
        """

        Class representing a stemming algorithm implementation.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor.

            Xapian::StemImplementation::StemImplementation()
            """
            if self.__class__ == StemImplementation:
                _self = None
            else:
                _self = self
            _xapian.StemImplementation_swiginit(self, _xapian.new_StemImplementation(_self, ))
        __swig_destroy__ = _xapian.delete_StemImplementation

        def __str__(self):
            """

            Return a string describing this object.

            virtual std::string Xapian::StemImplementation::get_description()
            const =0
            """
            return _xapian.StemImplementation___str__(self)

        def __disown__(self):
            self.this.disown()
            _xapian.disown_StemImplementation(self)
            return weakref_proxy(self)
    StemImplementation.__call__ = new_instancemethod(_xapian.StemImplementation___call__, None, StemImplementation)
    StemImplementation.__str__ = new_instancemethod(_xapian.StemImplementation___str__, None, StemImplementation)
    StemImplementation_swigregister = _xapian.StemImplementation_swigregister
    StemImplementation_swigregister(StemImplementation)

    class Stem(object):
        """

        Class representing a stemming algorithm.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct a Xapian::Stem object with a user-provided stemming
            algorithm.

            Xapian::Stem::Stem(StemImplementation *p)

            You can subclass Xapian::StemImplementation to implement your own
            stemming algorithm (or to wrap a third-party algorithm) and then wrap
            your implementation in a Xapian::Stem object to pass to the Xapian
            API.

            Parameters:
            -----------

            p:  The user-subclassed StemImplementation object. This is reference
            counted, and so will be automatically deleted by the Xapian::Stem
            wrapper when no longer required.
            """
            _xapian.Stem_swiginit(self, _xapian.new_Stem(*args))
        __swig_destroy__ = _xapian.delete_Stem

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::Stem::get_description() const
            """
            return _xapian.Stem___str__(self)

        get_available_languages = staticmethod(_xapian.Stem_get_available_languages)
    Stem.__call__ = new_instancemethod(_xapian.Stem___call__, None, Stem)
    Stem.__str__ = new_instancemethod(_xapian.Stem___str__, None, Stem)
    Stem_swigregister = _xapian.Stem_swigregister
    Stem_swigregister(Stem)

    def Stem_get_available_languages():
        return _xapian.Stem_get_available_languages()
    Stem_get_available_languages = _xapian.Stem_get_available_languages

    class TermGenerator(object):
        """

        Parses a piece of text and generate terms.

        This module takes a piece of text and parses it to produce words which
        are then used to generate suitable terms for indexing. The terms
        generated are suitable for use with Query objects produced by the
        QueryParser class.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor.

            Xapian::TermGenerator::TermGenerator()
            """
            _xapian.TermGenerator_swiginit(self, _xapian.new_TermGenerator())
        __swig_destroy__ = _xapian.delete_TermGenerator

        def set_stemmer(self, stemmer):
            """

            Set the Xapian::Stem object to be used for generating stemmed terms.

            void Xapian::TermGenerator::set_stemmer(const Xapian::Stem &stemmer)

            """
            return _xapian.TermGenerator_set_stemmer(self, stemmer)

        def set_stopper(self, stop=None):
            """

            Set the Xapian::Stopper object to be used for identifying stopwords.

            void Xapian::TermGenerator::set_stopper(const Xapian::Stopper
            *stop=NULL)

            Stemmed forms of stopwords aren't indexed, but unstemmed forms still
            are so that searches for phrases including stop words still work.

            Parameters:
            -----------

            stop:  The Stopper object to set (default NULL, which means no
            stopwords).
            """
            return _xapian.TermGenerator_set_stopper(self, stop)

        def set_document(self, doc):
            """

            Set the current document.

            void Xapian::TermGenerator::set_document(const Xapian::Document &doc)

            """
            return _xapian.TermGenerator_set_document(self, doc)

        def get_document(self):
            """

            Get the current document.

            const Xapian::Document& Xapian::TermGenerator::get_document() const
            """
            return _xapian.TermGenerator_get_document(self)

        def set_database(self, db):
            """

            Set the database to index spelling data to.

            void Xapian::TermGenerator::set_database(const
            Xapian::WritableDatabase &db)
            """
            return _xapian.TermGenerator_set_database(self, db)

        FLAG_SPELLING = _xapian.TermGenerator_FLAG_SPELLING
        FLAG_CJK_NGRAM = _xapian.TermGenerator_FLAG_CJK_NGRAM
        STEM_NONE = _xapian.TermGenerator_STEM_NONE
        STEM_SOME = _xapian.TermGenerator_STEM_SOME
        STEM_ALL = _xapian.TermGenerator_STEM_ALL
        STEM_ALL_Z = _xapian.TermGenerator_STEM_ALL_Z
        STEM_SOME_FULL_POS = _xapian.TermGenerator_STEM_SOME_FULL_POS
        STOP_NONE = _xapian.TermGenerator_STOP_NONE
        STOP_ALL = _xapian.TermGenerator_STOP_ALL
        STOP_STEMMED = _xapian.TermGenerator_STOP_STEMMED

        def set_flags(self, *args):
            """

            Set flags.

            flags Xapian::TermGenerator::set_flags(flags toggle, flags
            mask=flags(0))

            The new value of flags is: (flags & mask) ^ toggle

            To just set the flags, pass the new flags in toggle and the default
            value for mask.

            Parameters:
            -----------

            toggle:  Flags to XOR.

            mask:  Flags to AND with first.

            The old flags setting.
            """
            return _xapian.TermGenerator_set_flags(self, *args)

        def set_stemming_strategy(self, strategy):
            """

            Set the stemming strategy.

            void Xapian::TermGenerator::set_stemming_strategy(stem_strategy
            strategy)

            This method controls how the stemming algorithm is applied. It was new
            in Xapian 1.3.1.

            Parameters:
            -----------

            strategy:  The strategy to use - possible values are: STEM_NONE: Don't
            perform any stemming - only unstemmed terms are generated.

            STEM_SOME: Generate both stemmed (with a "Z" prefix) and unstemmed
            terms. No positional information is stored for unstemmed terms. This
            is the default strategy.

            STEM_SOME_FULL_POS: Like STEM_SOME but positional information is
            stored for both stemmed and unstemmed terms. Added in Xapian 1.4.8.

            STEM_ALL: Generate only stemmed terms (but without a "Z" prefix).

            STEM_ALL_Z: Generate only stemmed terms (with a "Z" prefix).
            """
            return _xapian.TermGenerator_set_stemming_strategy(self, strategy)

        def set_stopper_strategy(self, strategy):
            """

            Set the stopper strategy.

            void Xapian::TermGenerator::set_stopper_strategy(stop_strategy
            strategy)

            The method controls how the stopper is used. It was added in Xapian
            1.4.1.

            You need to also call  set_stopper() for this to have any effect.

            Parameters:
            -----------

            strategy:  The strategy to use - possible values are: STOP_NONE: Don't
            use the stopper.

            STOP_ALL: If a word is identified as a stop word, skip it completely.

            STOP_STEMMED: If a word is identified as a stop word, index its
            unstemmed form but skip the stem. Unstemmed forms are indexed with
            positional information by default, so this allows searches for phrases
            containing stopwords to be supported. (This is the default mode).
            """
            return _xapian.TermGenerator_set_stopper_strategy(self, strategy)

        def set_max_word_length(self, max_word_length):
            """

            Set the maximum length word to index.

            void Xapian::TermGenerator::set_max_word_length(unsigned
            max_word_length)

            The limit is on the length of a word prior to stemming and prior to
            adding any term prefix.

            The backends mostly impose a limit on the length of terms (often of
            about 240 bytes), but it's generally useful to have a lower limit to
            help prevent the index being bloated by useless junk terms from trying
            to indexing things like binary data, uuencoded data, ASCII art, etc.

            This method was new in Xapian 1.3.1.

            Parameters:
            -----------

            max_word_length:  The maximum length word to index, in bytes in UTF-8
            representation. Default is 64.
            """
            return _xapian.TermGenerator_set_max_word_length(self, max_word_length)

        def index_text(self, *args):
            """

            Index some text in a std::string.

            void Xapian::TermGenerator::index_text(const std::string &text,
            Xapian::termcount wdf_inc=1, const std::string &prefix=std::string())

            Parameters:
            -----------

            text:  The text to index.

            wdf_inc:  The wdf increment (default 1).

            prefix:  The term prefix to use (default is no prefix).
            """
            return _xapian.TermGenerator_index_text(self, *args)

        def index_text_without_positions(self, *args):
            """

            Index some text in a std::string without positional information.

            void Xapian::TermGenerator::index_text_without_positions(const
            std::string &text, Xapian::termcount wdf_inc=1, const std::string
            &prefix=std::string())

            Just like index_text, but no positional information is generated. This
            means that the database will be significantly smaller, but that phrase
            searching and NEAR won't be supported.

            Parameters:
            -----------

            text:  The text to index.

            wdf_inc:  The wdf increment (default 1).

            prefix:  The term prefix to use (default is no prefix).
            """
            return _xapian.TermGenerator_index_text_without_positions(self, *args)

        def increase_termpos(self, delta=100):
            """

            Increase the term position used by index_text.

            void Xapian::TermGenerator::increase_termpos(Xapian::termpos
            delta=100)

            This can be used between indexing text from different fields or other
            places to prevent phrase searches from spanning between them (e.g.
            between the title and body text, or between two chapters in a book).

            Parameters:
            -----------

            delta:  Amount to increase the term position by (default: 100).
            """
            return _xapian.TermGenerator_increase_termpos(self, delta)

        def get_termpos(self):
            """

            Get the current term position.

            Xapian::termpos Xapian::TermGenerator::get_termpos() const
            """
            return _xapian.TermGenerator_get_termpos(self)

        def set_termpos(self, termpos):
            """

            Set the current term position.

            void Xapian::TermGenerator::set_termpos(Xapian::termpos termpos)

            Parameters:
            -----------

            termpos:  The new term position to set.
            """
            return _xapian.TermGenerator_set_termpos(self, termpos)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::TermGenerator::get_description() const
            """
            return _xapian.TermGenerator___str__(self)

    TermGenerator.set_stemmer = new_instancemethod(_xapian.TermGenerator_set_stemmer, None, TermGenerator)
    TermGenerator.set_stopper = new_instancemethod(_xapian.TermGenerator_set_stopper, None, TermGenerator)
    TermGenerator.set_document = new_instancemethod(_xapian.TermGenerator_set_document, None, TermGenerator)
    TermGenerator.get_document = new_instancemethod(_xapian.TermGenerator_get_document, None, TermGenerator)
    TermGenerator.set_database = new_instancemethod(_xapian.TermGenerator_set_database, None, TermGenerator)
    TermGenerator.set_flags = new_instancemethod(_xapian.TermGenerator_set_flags, None, TermGenerator)
    TermGenerator.set_stemming_strategy = new_instancemethod(_xapian.TermGenerator_set_stemming_strategy, None, TermGenerator)
    TermGenerator.set_stopper_strategy = new_instancemethod(_xapian.TermGenerator_set_stopper_strategy, None, TermGenerator)
    TermGenerator.set_max_word_length = new_instancemethod(_xapian.TermGenerator_set_max_word_length, None, TermGenerator)
    TermGenerator.index_text = new_instancemethod(_xapian.TermGenerator_index_text, None, TermGenerator)
    TermGenerator.index_text_without_positions = new_instancemethod(_xapian.TermGenerator_index_text_without_positions, None, TermGenerator)
    TermGenerator.increase_termpos = new_instancemethod(_xapian.TermGenerator_increase_termpos, None, TermGenerator)
    TermGenerator.get_termpos = new_instancemethod(_xapian.TermGenerator_get_termpos, None, TermGenerator)
    TermGenerator.set_termpos = new_instancemethod(_xapian.TermGenerator_set_termpos, None, TermGenerator)
    TermGenerator.__str__ = new_instancemethod(_xapian.TermGenerator___str__, None, TermGenerator)
    TermGenerator_swigregister = _xapian.TermGenerator_swigregister
    TermGenerator_swigregister(TermGenerator)

    class MSet(object):
        """

        Class representing a list of search results.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor.

            Xapian::MSet::MSet()

            Creates an empty MSet, mostly useful as a placeholder.
            """
            _xapian.MSet_swiginit(self, _xapian.new_MSet())
        __swig_destroy__ = _xapian.delete_MSet

        def convert_to_percent(self, *args):
            """

            Convert the weight of the current iterator position to a percentage.

            int Xapian::MSet::convert_to_percent(const MSetIterator &it) const

            The matching document with the highest weight will get 100% if it
            matches all the weighted query terms, and proportionally less if it
            only matches some, and other weights are scaled by the same factor.

            Documents with a non-zero score will always score at least 1%.

            Note that these generally aren't percentages of anything meaningful
            (unless you use a custom weighting formula where they are!)
            """
            return _xapian.MSet_convert_to_percent(self, *args)

        def get_termfreq(self, term):
            """

            Get the termfreq of a term.

            Xapian::doccount Xapian::MSet::get_termfreq(const std::string &term)
            const

            The number of documents term occurs in.
            """
            return _xapian.MSet_get_termfreq(self, term)

        def get_termweight(self, term):
            """

            Get the term weight of a term.

            double Xapian::MSet::get_termweight(const std::string &term) const

            The maximum weight that term could have contributed to a document.
            """
            return _xapian.MSet_get_termweight(self, term)

        def get_firstitem(self):
            """

            Rank of first item in this MSet.

            Xapian::doccount Xapian::MSet::get_firstitem() const

            This is the parameter first passed to Xapian::Enquire::get_mset().
            """
            return _xapian.MSet_get_firstitem(self)

        def get_matches_lower_bound(self):
            """

            Lower bound on the total number of matching documents.

            Xapian::doccount Xapian::MSet::get_matches_lower_bound() const
            """
            return _xapian.MSet_get_matches_lower_bound(self)

        def get_matches_estimated(self):
            """

            Estimate of the total number of matching documents.

            Xapian::doccount Xapian::MSet::get_matches_estimated() const
            """
            return _xapian.MSet_get_matches_estimated(self)

        def get_matches_upper_bound(self):
            """

            Upper bound on the total number of matching documents.

            Xapian::doccount Xapian::MSet::get_matches_upper_bound() const
            """
            return _xapian.MSet_get_matches_upper_bound(self)

        def get_uncollapsed_matches_lower_bound(self):
            """

            Lower bound on the total number of matching documents before
            collapsing.

            Xapian::doccount Xapian::MSet::get_uncollapsed_matches_lower_bound()
            const

            Conceptually the same as get_matches_lower_bound() for the same query
            without any collapse part (though the actual value may differ).
            """
            return _xapian.MSet_get_uncollapsed_matches_lower_bound(self)

        def get_uncollapsed_matches_estimated(self):
            """

            Estimate of the total number of matching documents before collapsing.

            Xapian::doccount Xapian::MSet::get_uncollapsed_matches_estimated()
            const

            Conceptually the same as get_matches_estimated() for the same query
            without any collapse part (though the actual value may differ).
            """
            return _xapian.MSet_get_uncollapsed_matches_estimated(self)

        def get_uncollapsed_matches_upper_bound(self):
            """

            Upper bound on the total number of matching documents before
            collapsing.

            Xapian::doccount Xapian::MSet::get_uncollapsed_matches_upper_bound()
            const

            Conceptually the same as get_matches_upper_bound() for the same query
            without any collapse part (though the actual value may differ).
            """
            return _xapian.MSet_get_uncollapsed_matches_upper_bound(self)

        def get_max_attained(self):
            """

            The maximum weight attained by any document.

            double Xapian::MSet::get_max_attained() const
            """
            return _xapian.MSet_get_max_attained(self)

        def get_max_possible(self):
            """

            The maximum possible weight any document could achieve.

            double Xapian::MSet::get_max_possible() const
            """
            return _xapian.MSet_get_max_possible(self)

        SNIPPET_BACKGROUND_MODEL = _xapian.MSet_SNIPPET_BACKGROUND_MODEL
        SNIPPET_EXHAUSTIVE = _xapian.MSet_SNIPPET_EXHAUSTIVE
        SNIPPET_EMPTY_WITHOUT_MATCH = _xapian.MSet_SNIPPET_EMPTY_WITHOUT_MATCH

        def snippet(self, *args):
            """

            Generate a snippet.

            std::string Xapian::MSet::snippet(const std::string &text, size_t
            length=500, const Xapian::Stem &stemmer=Xapian::Stem(), unsigned
            flags=SNIPPET_BACKGROUND_MODEL|SNIPPET_EXHAUSTIVE, const std::string
            &hi_start="<b>", const std::string &hi_end="</b>", const
            std::string &omit="...") const

            This method selects a continuous run of words from text, based mainly
            on where the query matches (currently terms, exact phrases and
            wildcards are taken into account). If flag SNIPPET_BACKGROUND_MODEL is
            used (which it is by default) then the selection algorithm also
            considers the non-query terms in the text with the aim of showing a
            context which provides more useful information.

            The size of the text selected can be controlled by the length
            parameter, which specifies a number of bytes of text to aim to select.
            However slightly more text may be selected. Also the size of any
            escaping, highlighting or omission markers is not considered.

            The returned text is escaped to make it suitable for use in HTML
            (though beware that in upstream releases 1.4.5 and earlier this
            escaping was sometimes incomplete), and matches with the query will be
            highlighted using hi_start and hi_end.

            If the snippet seems to start or end mid-sentence, then omit is
            prepended or append (respectively) to indicate this.

            The same stemming algorithm which was used to build the query should
            be specified in stemmer.

            And flags contains flags controlling behaviour.

            Added in 1.3.5.
            """
            return _xapian.MSet_snippet(self, *args)

        def fetch(self, *args):
            """

            Prefetch hint the whole MSet.

            void Xapian::MSet::fetch() const

            For a remote database, this may start a pipelined fetch of the
            requested documents from the remote server.

            For a disk-based database, this may send prefetch hints to the
            operating system such that the disk blocks the requested documents are
            stored in are more likely to be in the cache when we come to actually
            read them.
            """
            return _xapian.MSet_fetch(self, *args)

        def size(self):
            """

            Return number of items in this MSet object.

            Xapian::doccount Xapian::MSet::size() const
            """
            return _xapian.MSet_size(self)

        def empty(self):
            """

            Return true if this MSet object is empty.

            bool Xapian::MSet::empty() const
            """
            return _xapian.MSet_empty(self)

        def _begin(self):
            """

            Return iterator pointing to the first item in this MSet.

            MSetIterator Xapian::MSet::begin() const
            """
            return _xapian.MSet__begin(self)

        def _end(self):
            """

            Return iterator pointing to just after the last item in this MSet.

            MSetIterator Xapian::MSet::end() const
            """
            return _xapian.MSet__end(self)

        def back(self):
            """

            Return iterator pointing to the last object in this MSet.

            MSetIterator Xapian::MSet::back() const
            """
            return _xapian.MSet_back(self)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::MSet::get_description() const
            """
            return _xapian.MSet___str__(self)

        items = property(_xapian.MSet_items_get)

        def _get_hit_internal(self, i):
            """
            Get an item from the MSet.

            The supplied index is relative to the start of the MSet, not the absolute rank
            of the item.
            """
            return _xapian.MSet__get_hit_internal(self, i)

    MSet.convert_to_percent = new_instancemethod(_xapian.MSet_convert_to_percent, None, MSet)
    MSet.get_termfreq = new_instancemethod(_xapian.MSet_get_termfreq, None, MSet)
    MSet.get_termweight = new_instancemethod(_xapian.MSet_get_termweight, None, MSet)
    MSet.get_firstitem = new_instancemethod(_xapian.MSet_get_firstitem, None, MSet)
    MSet.get_matches_lower_bound = new_instancemethod(_xapian.MSet_get_matches_lower_bound, None, MSet)
    MSet.get_matches_estimated = new_instancemethod(_xapian.MSet_get_matches_estimated, None, MSet)
    MSet.get_matches_upper_bound = new_instancemethod(_xapian.MSet_get_matches_upper_bound, None, MSet)
    MSet.get_uncollapsed_matches_lower_bound = new_instancemethod(_xapian.MSet_get_uncollapsed_matches_lower_bound, None, MSet)
    MSet.get_uncollapsed_matches_estimated = new_instancemethod(_xapian.MSet_get_uncollapsed_matches_estimated, None, MSet)
    MSet.get_uncollapsed_matches_upper_bound = new_instancemethod(_xapian.MSet_get_uncollapsed_matches_upper_bound, None, MSet)
    MSet.get_max_attained = new_instancemethod(_xapian.MSet_get_max_attained, None, MSet)
    MSet.get_max_possible = new_instancemethod(_xapian.MSet_get_max_possible, None, MSet)
    MSet.snippet = new_instancemethod(_xapian.MSet_snippet, None, MSet)
    MSet.fetch = new_instancemethod(_xapian.MSet_fetch, None, MSet)
    MSet.size = new_instancemethod(_xapian.MSet_size, None, MSet)
    MSet.empty = new_instancemethod(_xapian.MSet_empty, None, MSet)
    MSet._begin = new_instancemethod(_xapian.MSet__begin, None, MSet)
    MSet._end = new_instancemethod(_xapian.MSet__end, None, MSet)
    MSet.back = new_instancemethod(_xapian.MSet_back, None, MSet)
    MSet.__str__ = new_instancemethod(_xapian.MSet___str__, None, MSet)
    MSet.__cmp__ = new_instancemethod(_xapian.MSet___cmp__, None, MSet)
    MSet.get_docid = new_instancemethod(_xapian.MSet_get_docid, None, MSet)
    MSet.get_document = new_instancemethod(_xapian.MSet_get_document, None, MSet)
    MSet._get_hit_internal = new_instancemethod(_xapian.MSet__get_hit_internal, None, MSet)
    MSet.get_document_percentage = new_instancemethod(_xapian.MSet_get_document_percentage, None, MSet)
    MSet_swigregister = _xapian.MSet_swigregister
    MSet_swigregister(MSet)

    class _MSetIterator(object):
        """

        Iterator over a Xapian::MSet.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr
        mset = property(_xapian._MSetIterator_mset_get, _xapian._MSetIterator_mset_set)
        off_from_end = property(_xapian._MSetIterator_off_from_end_get, _xapian._MSetIterator_off_from_end_set)

        def __init__(self):
            """

            Create an unpositioned MSetIterator.

            Xapian::MSetIterator::MSetIterator()
            """
            _xapian._MSetIterator_swiginit(self, _xapian.new__MSetIterator())

        def get_rank(self):
            """

            Return the MSet rank for the current position.

            Xapian::doccount Xapian::MSetIterator::get_rank() const

            The rank of mset[0] is mset.get_firstitem().
            """
            return _xapian._MSetIterator_get_rank(self)

        def get_document(self):
            """

            Get the Document object for the current position.

            Xapian::Document Xapian::MSetIterator::get_document() const
            """
            return _xapian._MSetIterator_get_document(self)

        def get_weight(self):
            """

            Get the weight for the current position.

            double Xapian::MSetIterator::get_weight() const
            """
            return _xapian._MSetIterator_get_weight(self)

        def get_collapse_key(self):
            """

            Return the collapse key for the current position.

            std::string Xapian::MSetIterator::get_collapse_key() const

            If collapsing isn't in use, an empty string will be returned.
            """
            return _xapian._MSetIterator_get_collapse_key(self)

        def get_collapse_count(self):
            """

            Return a count of the number of collapses done onto the current key.

            Xapian::doccount Xapian::MSetIterator::get_collapse_count() const

            This starts at 0, and is incremented each time an item is eliminated
            because its key is the same as that of the current item (as returned
            by get_collapse_key()).

            Note that this is NOT necessarily one less than the total number of
            matching documents with this collapse key due to various optimisations
            implemented in the matcher - for example, it can skip documents
            completely if it can prove their weight wouldn't be enough to make the
            result set.

            You can say is that if get_collapse_count() > 0 then there are >=
            get_collapse_count() other documents with the current collapse key.
            But if get_collapse_count() == 0 then there may or may not be other
            such documents.
            """
            return _xapian._MSetIterator_get_collapse_count(self)

        def get_sort_key(self):
            """

            Return the sort key for the current position.

            std::string Xapian::MSetIterator::get_sort_key() const

            If sorting didn't use a key then an empty string will be returned.

            Added in Xapian 1.4.6.
            """
            return _xapian._MSetIterator_get_sort_key(self)

        def get_percent(self):
            """

            Convert the weight of the current iterator position to a percentage.

            int Xapian::MSetIterator::get_percent() const

            The matching document with the highest weight will get 100% if it
            matches all the weighted query terms, and proportionally less if it
            only matches some, and other weights are scaled by the same factor.

            Documents with a non-zero score will always score at least 1%.

            Note that these generally aren't percentages of anything meaningful
            (unless you use a custom weighting formula where they are!)
            """
            return _xapian._MSetIterator_get_percent(self)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::MSetIterator::get_description() const
            """
            return _xapian._MSetIterator___str__(self)

        __swig_destroy__ = _xapian.delete__MSetIterator
    _MSetIterator.get_rank = new_instancemethod(_xapian._MSetIterator_get_rank, None, _MSetIterator)
    _MSetIterator.get_document = new_instancemethod(_xapian._MSetIterator_get_document, None, _MSetIterator)
    _MSetIterator.get_weight = new_instancemethod(_xapian._MSetIterator_get_weight, None, _MSetIterator)
    _MSetIterator.get_collapse_key = new_instancemethod(_xapian._MSetIterator_get_collapse_key, None, _MSetIterator)
    _MSetIterator.get_collapse_count = new_instancemethod(_xapian._MSetIterator_get_collapse_count, None, _MSetIterator)
    _MSetIterator.get_sort_key = new_instancemethod(_xapian._MSetIterator_get_sort_key, None, _MSetIterator)
    _MSetIterator.get_percent = new_instancemethod(_xapian._MSetIterator_get_percent, None, _MSetIterator)
    _MSetIterator.__str__ = new_instancemethod(_xapian._MSetIterator___str__, None, _MSetIterator)
    _MSetIterator.__eq__ = new_instancemethod(_xapian._MSetIterator___eq__, None, _MSetIterator)
    _MSetIterator.__ne__ = new_instancemethod(_xapian._MSetIterator___ne__, None, _MSetIterator)
    _MSetIterator.equals = new_instancemethod(_xapian._MSetIterator_equals, None, _MSetIterator)
    _MSetIterator.get_docid = new_instancemethod(_xapian._MSetIterator_get_docid, None, _MSetIterator)
    _MSetIterator.next = new_instancemethod(_xapian._MSetIterator_next, None, _MSetIterator)
    _MSetIterator.prev = new_instancemethod(_xapian._MSetIterator_prev, None, _MSetIterator)
    _MSetIterator_swigregister = _xapian._MSetIterator_swigregister
    _MSetIterator_swigregister(_MSetIterator)

    class ESet(object):
        """

        Class representing a list of search results.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor.

            Xapian::ESet::ESet()

            Creates an empty ESet, mostly useful as a placeholder.
            """
            _xapian.ESet_swiginit(self, _xapian.new_ESet())
        __swig_destroy__ = _xapian.delete_ESet

        def size(self):
            """

            Return number of items in this ESet object.

            Xapian::doccount Xapian::ESet::size() const
            """
            return _xapian.ESet_size(self)

        def empty(self):
            """

            Return true if this ESet object is empty.

            bool Xapian::ESet::empty() const
            """
            return _xapian.ESet_empty(self)

        def get_ebound(self):
            """

            Return a bound on the full size of this ESet object.

            Xapian::termcount Xapian::ESet::get_ebound() const

            This is a bound on size() if get_eset() had been called with maxitems
            set high enough that all results were returned.
            """
            return _xapian.ESet_get_ebound(self)

        def _begin(self):
            """

            Return iterator pointing to the first item in this ESet.

            ESetIterator Xapian::ESet::begin() const
            """
            return _xapian.ESet__begin(self)

        def _end(self):
            """

            Return iterator pointing to just after the last item in this ESet.

            ESetIterator Xapian::ESet::end() const
            """
            return _xapian.ESet__end(self)

        def back(self):
            """

            Return iterator pointing to the last object in this ESet.

            ESetIterator Xapian::ESet::back() const
            """
            return _xapian.ESet_back(self)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::ESet::get_description() const
            """
            return _xapian.ESet___str__(self)

        items = property(_xapian.ESet_items_get)
    ESet.size = new_instancemethod(_xapian.ESet_size, None, ESet)
    ESet.empty = new_instancemethod(_xapian.ESet_empty, None, ESet)
    ESet.get_ebound = new_instancemethod(_xapian.ESet_get_ebound, None, ESet)
    ESet._begin = new_instancemethod(_xapian.ESet__begin, None, ESet)
    ESet._end = new_instancemethod(_xapian.ESet__end, None, ESet)
    ESet.back = new_instancemethod(_xapian.ESet_back, None, ESet)
    ESet.__str__ = new_instancemethod(_xapian.ESet___str__, None, ESet)
    ESet_swigregister = _xapian.ESet_swigregister
    ESet_swigregister(ESet)

    class _ESetIterator(object):
        """

        Iterator over a Xapian::ESet.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr
        eset = property(_xapian._ESetIterator_eset_get, _xapian._ESetIterator_eset_set)
        off_from_end = property(_xapian._ESetIterator_off_from_end_get, _xapian._ESetIterator_off_from_end_set)

        def __init__(self):
            """

            Create an unpositioned ESetIterator.

            Xapian::ESetIterator::ESetIterator()
            """
            _xapian._ESetIterator_swiginit(self, _xapian.new__ESetIterator())

        def get_weight(self):
            """

            Get the weight for the current position.

            double Xapian::ESetIterator::get_weight() const
            """
            return _xapian._ESetIterator_get_weight(self)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::ESetIterator::get_description() const
            """
            return _xapian._ESetIterator___str__(self)

        __swig_destroy__ = _xapian.delete__ESetIterator
    _ESetIterator.get_weight = new_instancemethod(_xapian._ESetIterator_get_weight, None, _ESetIterator)
    _ESetIterator.__str__ = new_instancemethod(_xapian._ESetIterator___str__, None, _ESetIterator)
    _ESetIterator.__eq__ = new_instancemethod(_xapian._ESetIterator___eq__, None, _ESetIterator)
    _ESetIterator.__ne__ = new_instancemethod(_xapian._ESetIterator___ne__, None, _ESetIterator)
    _ESetIterator.equals = new_instancemethod(_xapian._ESetIterator_equals, None, _ESetIterator)
    _ESetIterator.get_term = new_instancemethod(_xapian._ESetIterator_get_term, None, _ESetIterator)
    _ESetIterator.next = new_instancemethod(_xapian._ESetIterator_next, None, _ESetIterator)
    _ESetIterator.prev = new_instancemethod(_xapian._ESetIterator_prev, None, _ESetIterator)
    _ESetIterator_swigregister = _xapian._ESetIterator_swigregister
    _ESetIterator_swigregister(_ESetIterator)

    def __eq__(*args):
        return _xapian.__eq__(*args)
    __eq__ = _xapian.__eq__

    def __lt__(*args):
        return _xapian.__lt__(*args)
    __lt__ = _xapian.__lt__

    def __gt__(*args):
        return _xapian.__gt__(*args)
    __gt__ = _xapian.__gt__

    def __ge__(*args):
        return _xapian.__ge__(*args)
    __ge__ = _xapian.__ge__

    def __le__(*args):
        return _xapian.__le__(*args)
    __le__ = _xapian.__le__

    def __add__(*args):
        return _xapian.__add__(*args)
    __add__ = _xapian.__add__
    class RSet(object):
        """

        A relevance set (R-Set).

        This is the set of documents which are marked as relevant, for use in
        modifying the term weights, and in performing query expansion.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor.

            Xapian::RSet::RSet()
            """
            _xapian.RSet_swiginit(self, _xapian.new_RSet())
        __swig_destroy__ = _xapian.delete_RSet

        def size(self):
            """

            The number of documents in this R-Set.

            Xapian::doccount Xapian::RSet::size() const
            """
            return _xapian.RSet_size(self)

        def empty(self):
            """

            Test if this R-Set is empty.

            bool Xapian::RSet::empty() const
            """
            return _xapian.RSet_empty(self)

        def add_document(self, *args):
            """

            Add a document to the relevance set.

            void Xapian::RSet::add_document(const Xapian::MSetIterator &i)
            """
            return _xapian.RSet_add_document(self, *args)

        def remove_document(self, *args):
            """

            Remove a document from the relevance set.

            void Xapian::RSet::remove_document(const Xapian::MSetIterator &i)
            """
            return _xapian.RSet_remove_document(self, *args)

        def contains(self, *args):
            """

            Test if a given document in the relevance set.

            bool Xapian::RSet::contains(const Xapian::MSetIterator &i) const
            """
            return _xapian.RSet_contains(self, *args)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::RSet::get_description() const
            """
            return _xapian.RSet___str__(self)

    RSet.size = new_instancemethod(_xapian.RSet_size, None, RSet)
    RSet.empty = new_instancemethod(_xapian.RSet_empty, None, RSet)
    RSet.add_document = new_instancemethod(_xapian.RSet_add_document, None, RSet)
    RSet.remove_document = new_instancemethod(_xapian.RSet_remove_document, None, RSet)
    RSet.contains = new_instancemethod(_xapian.RSet_contains, None, RSet)
    RSet.__str__ = new_instancemethod(_xapian.RSet___str__, None, RSet)
    RSet_swigregister = _xapian.RSet_swigregister
    RSet_swigregister(RSet)

    class MatchDecider(object):
        """

        Base class for matcher decision functor.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor.

            Xapian::MatchDecider::MatchDecider()
            """
            if self.__class__ == MatchDecider:
                _self = None
            else:
                _self = self
            _xapian.MatchDecider_swiginit(self, _xapian.new_MatchDecider(_self, ))
        __swig_destroy__ = _xapian.delete_MatchDecider
        def __disown__(self):
            self.this.disown()
            _xapian.disown_MatchDecider(self)
            return weakref_proxy(self)
    MatchDecider.__call__ = new_instancemethod(_xapian.MatchDecider___call__, None, MatchDecider)
    MatchDecider_swigregister = _xapian.MatchDecider_swigregister
    MatchDecider_swigregister(MatchDecider)

    class Enquire(object):
        """

        This class provides an interface to the information retrieval system
        for the purpose of searching.

        Databases are usually opened lazily, so exceptions may not be thrown
        where you would expect them to be. You should catch Xapian::Error
        exceptions when calling any method in Xapian::Enquire.

        Parameters:
        -----------

        Xapian::InvalidArgumentError:  will be thrown if an invalid argument
        is supplied, for example, an unknown database type.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, database):
            """

            Create a Xapian::Enquire object.

            Xapian::Enquire::Enquire(const Database &database, ErrorHandler
            *errorhandler_)

            This specification cannot be changed once the Xapian::Enquire is
            opened: you must create a new Xapian::Enquire object to access a
            different database, or set of databases.

            The database supplied must have been initialised (ie, must not be the
            result of calling the Database::Database() constructor). If you need
            to handle a situation where you have no databases gracefully, a
            database created with DB_BACKEND_INMEMORY can be passed here to
            provide a completely empty database.

            Parameters:
            -----------

            database:  Specification of the database or databases to use.

            errorhandler_:  This parameter is deprecated (since Xapian 1.3.1), and
            as of 1.3.5 it's ignored completely.

            Parameters:
            -----------

            Xapian::InvalidArgumentError:  will be thrown if an empty Database
            object is supplied.
            """
            _xapian.Enquire_swiginit(self, _xapian.new_Enquire(database))
        __swig_destroy__ = _xapian.delete_Enquire

        def set_query(self, query, qlen=0):
            """

            Set the query to run.

            void Xapian::Enquire::set_query(const Xapian::Query &query,
            Xapian::termcount qlen=0)

            Parameters:
            -----------

            query:  the new query to run.

            qlen:  the query length to use in weight calculations - by default the
            sum of the wqf of all terms is used.
            """
            return _xapian.Enquire_set_query(self, query, qlen)

        def get_query(self):
            """

            Get the current query.

            const Xapian::Query& Xapian::Enquire::get_query() const

            If called before set_query(), this will return a default initialised
            Query object.
            """
            return _xapian.Enquire_get_query(self)

        def add_matchspy(self, spy):
            """

            Add a matchspy.

            void Xapian::Enquire::add_matchspy(MatchSpy *spy)

            This matchspy will be called with some of the documents which match
            the query, during the match process. Exactly which of the matching
            documents are passed to it depends on exactly when certain
            optimisations occur during the match process, but it can be controlled
            to some extent by setting the checkatleast parameter to  get_mset().

            In particular, if there are enough matching documents, at least the
            number specified by checkatleast will be passed to the matchspy. This
            means that you can force the matchspy to be shown all matching
            documents by setting checkatleast to the number of documents in the
            database.

            Parameters:
            -----------

            spy:  The MatchSpy subclass to add. The caller must ensure that this
            remains valid while the Enquire object remains active, or until
            clear_matchspies() is called.
            """
            return _xapian.Enquire_add_matchspy(self, spy)

        def clear_matchspies(self):
            """

            Remove all the matchspies.

            void Xapian::Enquire::clear_matchspies()
            """
            return _xapian.Enquire_clear_matchspies(self)

        def set_weighting_scheme(self, weight_):
            """

            Set the weighting scheme to use for queries.

            void Xapian::Enquire::set_weighting_scheme(const Weight &weight_)

            Parameters:
            -----------

            weight_:  the new weighting scheme. If no weighting scheme is
            specified, the default is BM25 with the default parameters.
            """
            return _xapian.Enquire_set_weighting_scheme(self, weight_)

        def set_expansion_scheme(self, eweightname_, expand_k_=1.0):
            """

            Set the weighting scheme to use for expansion.

            void Xapian::Enquire::set_expansion_scheme(const std::string
            &eweightname_, double expand_k_=1.0) const

            If you don't call this method, the default is as if you'd used:

            get_expansion_scheme("trad");

            Parameters:
            -----------

            eweightname_:  A string in lowercase specifying the name of the scheme
            to be used. The following schemes are currently available: "bo1" :
            The Bo1 scheme for query expansion. "trad" : The TradWeight scheme
            for query expansion.

            expand_k_:  The parameter required for TradWeight query expansion. A
            default value of 1.0 is used if none is specified.
            """
            return _xapian.Enquire_set_expansion_scheme(self, eweightname_, expand_k_)

        def set_collapse_key(self, collapse_key, collapse_max=1):
            """

            Set the collapse key to use for queries.

            void Xapian::Enquire::set_collapse_key(Xapian::valueno collapse_key,
            Xapian::doccount collapse_max=1)

            Parameters:
            -----------

            collapse_key:  value number to collapse on - at most one MSet entry
            with each particular value will be returned (default is
            Xapian::BAD_VALUENO which means no collapsing).

            collapse_max:  Max number of items with the same key to leave after
            collapsing (default 1).

            The MSet returned by get_mset() will have only the "best" (at most)
            collapse_max entries with each particular value of collapse_key
            ("best" being highest ranked - i.e. highest weight or highest
            sorting key).

            An example use might be to create a value for each document containing
            an MD5 hash of the document contents. Then duplicate documents from
            different sources can be eliminated at search time by collapsing with
            collapse_max = 1 (it's better to eliminate duplicates at index time,
            but this may not be always be possible - for example the search may be
            over more than one Xapian database).

            Another use is to group matches in a particular category (e.g. you
            might collapse a mailing list search on the Subject: so that there's
            only one result per discussion thread). In this case you can use
            get_collapse_count() to give the user some idea how many other results
            there are. And if you index the Subject: as a boolean term as well as
            putting it in a value, you can offer a link to a non-collapsed search
            restricted to that thread using a boolean filter.
            """
            return _xapian.Enquire_set_collapse_key(self, collapse_key, collapse_max)

        ASCENDING = _xapian.Enquire_ASCENDING
        DESCENDING = _xapian.Enquire_DESCENDING
        DONT_CARE = _xapian.Enquire_DONT_CARE

        def set_docid_order(self, order):
            """

            Set sort order for document IDs.

            void Xapian::Enquire::set_docid_order(docid_order order)

            This order only has an effect on documents which would otherwise have
            equal rank. When ordering by relevance without a sort key, this means
            documents with equal weight. For a boolean match with no sort key,
            this means all documents. And if a sort key is used, this means
            documents with the same sort key (and also equal weight if ordering on
            relevance before or after the sort key).

            Parameters:
            -----------

            order:  This can be:  Xapian::Enquire::ASCENDING docids sort in
            ascending order (default)

            Xapian::Enquire::DESCENDING docids sort in descending order

            Xapian::Enquire::DONT_CARE docids sort in whatever order is most
            efficient for the backend

            Note: If you add documents in strict date order, then a boolean search
            - i.e. set_weighting_scheme(Xapian::BoolWeight()) - with
            set_docid_order(Xapian::Enquire::DESCENDING) is an efficient way to
            perform "sort by date, newest first", and with
            set_docid_order(Xapian::Enquire::ASCENDING) a very efficient way to
            perform "sort by date, oldest first".
            """
            return _xapian.Enquire_set_docid_order(self, order)

        def set_cutoff(self, percent_cutoff, weight_cutoff=0):
            """

            Set the percentage and/or weight cutoffs.

            void Xapian::Enquire::set_cutoff(int percent_cutoff, double
            weight_cutoff=0)

            Parameters:
            -----------

            percent_cutoff:  Minimum percentage score for returned documents. If a
            document has a lower percentage score than this, it will not appear in
            the MSet. If your intention is to return only matches which contain
            all the terms in the query, then it's more efficient to use
            Xapian::Query::OP_AND instead of Xapian::Query::OP_OR in the query
            than to use set_cutoff(100). (default 0 => no percentage cut-off).

            weight_cutoff:  Minimum weight for a document to be returned. If a
            document has a lower score that this, it will not appear in the MSet.
            It is usually only possible to choose an appropriate weight for cutoff
            based on the results of a previous run of the same query; this is thus
            mainly useful for alerting operations. The other potential use is with
            a user specified weighting scheme. (default 0 => no weight cut-off).

            """
            return _xapian.Enquire_set_cutoff(self, percent_cutoff, weight_cutoff)

        def set_sort_by_relevance(self):
            """

            Set the sorting to be by relevance only.

            void Xapian::Enquire::set_sort_by_relevance()

            This is the default.
            """
            return _xapian.Enquire_set_sort_by_relevance(self)

        def set_sort_by_value(self, sort_key, reverse):
            """

            Set the sorting to be by value only.

            void Xapian::Enquire::set_sort_by_value(Xapian::valueno sort_key, bool
            reverse)

            Note that sorting by values uses a string comparison, so to use this
            to sort by a numeric value you'll need to store the numeric values in
            a manner which sorts appropriately. For example, you could use
            Xapian::sortable_serialise() (which works for floating point numbers
            as well as integers), or store numbers padded with leading zeros or
            spaces, or with the number of digits prepended.

            Parameters:
            -----------

            sort_key:  value number to sort on.

            reverse:  If true, reverses the sort order.
            """
            return _xapian.Enquire_set_sort_by_value(self, sort_key, reverse)

        def set_sort_by_key(self, sorter, reverse):
            """

            Set the sorting to be by key generated from values only.

            void Xapian::Enquire::set_sort_by_key(Xapian::KeyMaker *sorter, bool
            reverse)

            Parameters:
            -----------

            sorter:  The functor to use for generating keys.

            reverse:  If true, reverses the sort order.
            """
            return _xapian.Enquire_set_sort_by_key(self, sorter, reverse)

        def set_sort_by_value_then_relevance(self, sort_key, reverse):
            """

            Set the sorting to be by value, then by relevance for documents with
            the same value.

            void Xapian::Enquire::set_sort_by_value_then_relevance(Xapian::valueno
            sort_key, bool reverse)

            Note that sorting by values uses a string comparison, so to use this
            to sort by a numeric value you'll need to store the numeric values in
            a manner which sorts appropriately. For example, you could use
            Xapian::sortable_serialise() (which works for floating point numbers
            as well as integers), or store numbers padded with leading zeros or
            spaces, or with the number of digits prepended.

            Parameters:
            -----------

            sort_key:  value number to sort on.

            reverse:  If true, reverses the sort order.
            """
            return _xapian.Enquire_set_sort_by_value_then_relevance(self, sort_key, reverse)

        def set_sort_by_key_then_relevance(self, sorter, reverse):
            """

            Set the sorting to be by keys generated from values, then by relevance
            for documents with identical keys.

            void Xapian::Enquire::set_sort_by_key_then_relevance(Xapian::KeyMaker
            *sorter, bool reverse)

            Parameters:
            -----------

            sorter:  The functor to use for generating keys.

            reverse:  If true, reverses the sort order.
            """
            return _xapian.Enquire_set_sort_by_key_then_relevance(self, sorter, reverse)

        def set_sort_by_relevance_then_value(self, sort_key, reverse):
            """

            Set the sorting to be by relevance then value.

            void Xapian::Enquire::set_sort_by_relevance_then_value(Xapian::valueno
            sort_key, bool reverse)

            Note that sorting by values uses a string comparison, so to use this
            to sort by a numeric value you'll need to store the numeric values in
            a manner which sorts appropriately. For example, you could use
            Xapian::sortable_serialise() (which works for floating point numbers
            as well as integers), or store numbers padded with leading zeros or
            spaces, or with the number of digits prepended.

            Note that with the default BM25 weighting scheme parameters, non-
            identical documents will rarely have the same weight, so this setting
            will give very similar results to set_sort_by_relevance(). It becomes
            more useful with particular BM25 parameter settings (e.g.
            BM25Weight(1,0,1,0,0)) or custom weighting schemes.

            Parameters:
            -----------

            sort_key:  value number to sort on.

            reverse:  If true, reverses the sort order of sort_key. Beware that in
            1.2.16 and earlier, the sense of this parameter was incorrectly
            inverted and inconsistent with the other set_sort_by_... methods. This
            was fixed in 1.2.17, so make that version a minimum requirement if
            this detail matters to your application.
            """
            return _xapian.Enquire_set_sort_by_relevance_then_value(self, sort_key, reverse)

        def set_sort_by_relevance_then_key(self, sorter, reverse):
            """

            Set the sorting to be by relevance, then by keys generated from
            values.

            void Xapian::Enquire::set_sort_by_relevance_then_key(Xapian::KeyMaker
            *sorter, bool reverse)

            Note that with the default BM25 weighting scheme parameters, non-
            identical documents will rarely have the same weight, so this setting
            will give very similar results to set_sort_by_relevance(). It becomes
            more useful with particular BM25 parameter settings (e.g.
            BM25Weight(1,0,1,0,0)) or custom weighting schemes.

            Parameters:
            -----------

            sorter:  The functor to use for generating keys.

            reverse:  If true, reverses the sort order of the generated keys.
            Beware that in 1.2.16 and earlier, the sense of this parameter was
            incorrectly inverted and inconsistent with the other set_sort_by_...
            methods. This was fixed in 1.2.17, so make that version a minimum
            requirement if this detail matters to your application.
            """
            return _xapian.Enquire_set_sort_by_relevance_then_key(self, sorter, reverse)

        def set_time_limit(self, time_limit):
            """

            Set a time limit for the match.

            void Xapian::Enquire::set_time_limit(double time_limit)

            Matches with check_at_least set high can take a long time in some
            cases. You can set a time limit on this, after which check_at_least
            will be turned off.

            Parameters:
            -----------

            time_limit:  time in seconds after which to disable check_at_least
            (default: 0.0 which means no time limit)

            Limitations:

            This feature is currently supported on platforms which support POSIX
            interval timers. Interaction with the remote backend when using
            multiple databases may have bugs. There's not currently a way to force
            the match to end after a certain time.
            """
            return _xapian.Enquire_set_time_limit(self, time_limit)

        def get_mset(self, *args):
            """

            Get (a portion of) the match set for the current query.

            MSet Xapian::Enquire::get_mset(Xapian::doccount first,
            Xapian::doccount maxitems, const RSet *omrset, const MatchDecider
            *mdecider=0) const

            Parameters:
            -----------

            first:  the first item in the result set to return. A value of zero
            corresponds to the first item returned being that with the highest
            score. A value of 10 corresponds to the first 10 items being ignored,
            and the returned items starting at the eleventh.

            maxitems:  the maximum number of items to return. If you want all
            matches, then you can pass the result of calling get_doccount() on the
            Database object (though if you are doing this so you can filter
            results, you are likely to get much better performance by using
            Xapian's match-time filtering features instead). You can pass 0 for
            maxitems which will give you an empty MSet with valid statistics (such
            as get_matches_estimated()) calculated without looking at any
            postings, which is very quick, but means the estimates may be more
            approximate and the bounds may be much looser.

            omrset:  the relevance set to use when performing the query.

            mdecider:  a decision functor to use to decide whether a given
            document should be put in the MSet.

            A Xapian::MSet object containing the results of the query.

            Parameters:
            -----------

            Xapian::InvalidArgumentError:  See class documentation.
            """
            return _xapian.Enquire_get_mset(self, *args)

        INCLUDE_QUERY_TERMS = _xapian.Enquire_INCLUDE_QUERY_TERMS
        USE_EXACT_TERMFREQ = _xapian.Enquire_USE_EXACT_TERMFREQ

        def get_eset(self, *args):
            """

            Get the expand set for the given rset.

            ESet Xapian::Enquire::get_eset(Xapian::termcount maxitems, const RSet
            &rset, int flags, double k, const Xapian::ExpandDecider
            *edecider=NULL, double min_wt=0.0) const

            Parameters:
            -----------

            maxitems:  the maximum number of items to return.

            rset:  the relevance set to use when performing the expand operation.

            flags:  zero or more of these values |-ed together:
            Xapian::Enquire::INCLUDE_QUERY_TERMS query terms may be returned from
            expand

            Xapian::Enquire::USE_EXACT_TERMFREQ for multi dbs, calculate the exact
            termfreq; otherwise an approximation is used which can greatly improve
            efficiency, but still returns good results.

            k:  the parameter k in the query expansion algorithm (default is 1.0)

            edecider:  a decision functor to use to decide whether a given term
            should be put in the ESet

            min_wt:  the minimum weight for included terms

            An ESet object containing the results of the expand.

            Parameters:
            -----------

            Xapian::InvalidArgumentError:  See class documentation.
            """
            return _xapian.Enquire_get_eset(self, *args)

        def _get_matching_terms_begin(self, *args):
            """

            Get terms which match a given document, by match set item.

            TermIterator Xapian::Enquire::get_matching_terms_begin(const
            MSetIterator &it) const

            This method returns the terms in the current query which match the
            given document.

            If the underlying database has suitable support, using this call
            (rather than passing a Xapian::docid) will enable the system to ensure
            that the correct data is returned, and that the document has not been
            deleted or changed since the query was performed.

            Parameters:
            -----------

            it:  The iterator for which to retrieve the matching terms.

            An iterator returning the terms which match the document. The terms
            will be returned (as far as this makes any sense) in the same order as
            the terms in the query. Terms will not occur more than once, even if
            they do in the query.

            Parameters:
            -----------

            Xapian::InvalidArgumentError:  See class documentation.

            Xapian::DocNotFoundError:  The document specified could not be found
            in the database.
            """
            return _xapian.Enquire__get_matching_terms_begin(self, *args)

        def _get_matching_terms_end(self, *args):
            """

            End iterator corresponding to get_matching_terms_begin()

            TermIterator Xapian::Enquire::get_matching_terms_end(const
            MSetIterator &) const
            """
            return _xapian.Enquire__get_matching_terms_end(self, *args)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::Enquire::get_description() const
            """
            return _xapian.Enquire___str__(self)

    Enquire.set_query = new_instancemethod(_xapian.Enquire_set_query, None, Enquire)
    Enquire.get_query = new_instancemethod(_xapian.Enquire_get_query, None, Enquire)
    Enquire.add_matchspy = new_instancemethod(_xapian.Enquire_add_matchspy, None, Enquire)
    Enquire.clear_matchspies = new_instancemethod(_xapian.Enquire_clear_matchspies, None, Enquire)
    Enquire.set_weighting_scheme = new_instancemethod(_xapian.Enquire_set_weighting_scheme, None, Enquire)
    Enquire.set_expansion_scheme = new_instancemethod(_xapian.Enquire_set_expansion_scheme, None, Enquire)
    Enquire.set_collapse_key = new_instancemethod(_xapian.Enquire_set_collapse_key, None, Enquire)
    Enquire.set_docid_order = new_instancemethod(_xapian.Enquire_set_docid_order, None, Enquire)
    Enquire.set_cutoff = new_instancemethod(_xapian.Enquire_set_cutoff, None, Enquire)
    Enquire.set_sort_by_relevance = new_instancemethod(_xapian.Enquire_set_sort_by_relevance, None, Enquire)
    Enquire.set_sort_by_value = new_instancemethod(_xapian.Enquire_set_sort_by_value, None, Enquire)
    Enquire.set_sort_by_key = new_instancemethod(_xapian.Enquire_set_sort_by_key, None, Enquire)
    Enquire.set_sort_by_value_then_relevance = new_instancemethod(_xapian.Enquire_set_sort_by_value_then_relevance, None, Enquire)
    Enquire.set_sort_by_key_then_relevance = new_instancemethod(_xapian.Enquire_set_sort_by_key_then_relevance, None, Enquire)
    Enquire.set_sort_by_relevance_then_value = new_instancemethod(_xapian.Enquire_set_sort_by_relevance_then_value, None, Enquire)
    Enquire.set_sort_by_relevance_then_key = new_instancemethod(_xapian.Enquire_set_sort_by_relevance_then_key, None, Enquire)
    Enquire.set_time_limit = new_instancemethod(_xapian.Enquire_set_time_limit, None, Enquire)
    Enquire.get_mset = new_instancemethod(_xapian.Enquire_get_mset, None, Enquire)
    Enquire.get_eset = new_instancemethod(_xapian.Enquire_get_eset, None, Enquire)
    Enquire._get_matching_terms_begin = new_instancemethod(_xapian.Enquire__get_matching_terms_begin, None, Enquire)
    Enquire._get_matching_terms_end = new_instancemethod(_xapian.Enquire__get_matching_terms_end, None, Enquire)
    Enquire.__str__ = new_instancemethod(_xapian.Enquire___str__, None, Enquire)
    Enquire_swigregister = _xapian.Enquire_swigregister
    Enquire_swigregister(Enquire)

    class ExpandDecider(object):
        """

        Virtual base class for expand decider functor.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor.

            Xapian::ExpandDecider::ExpandDecider()
            """
            if self.__class__ == ExpandDecider:
                _self = None
            else:
                _self = self
            _xapian.ExpandDecider_swiginit(self, _xapian.new_ExpandDecider(_self, ))
        __swig_destroy__ = _xapian.delete_ExpandDecider

        def release(self):
            """

            Start reference counting this object.

            const ExpandDecider* Xapian::ExpandDecider::release() const

            You can hand ownership of a dynamically allocated ExpandDecider object
            to Xapian by calling release() and then passing the object to a Xapian
            method. Xapian will arrange to delete the object once it is no longer
            required.
            """
            return _xapian.ExpandDecider_release(self)

        def __disown__(self):
            self.this.disown()
            _xapian.disown_ExpandDecider(self)
            return weakref_proxy(self)
    ExpandDecider.__call__ = new_instancemethod(_xapian.ExpandDecider___call__, None, ExpandDecider)
    ExpandDecider.release = new_instancemethod(_xapian.ExpandDecider_release, None, ExpandDecider)
    ExpandDecider_swigregister = _xapian.ExpandDecider_swigregister
    ExpandDecider_swigregister(ExpandDecider)

    class ExpandDeciderAnd(ExpandDecider):
        """

        ExpandDecider subclass which rejects terms using two ExpandDeciders.

        Terms are only accepted if they are accepted by both of the specified
        ExpandDecider objects.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, first_, second_):
            """

            Compatibility method.

            Xapian::ExpandDeciderAnd::ExpandDeciderAnd(const ExpandDecider
            *first_, const ExpandDecider *second_)

            Parameters:
            -----------

            first_:  First ExpandDecider object to test with.

            second_:   ExpandDecider object to test with if first_ accepts.
            """
            _xapian.ExpandDeciderAnd_swiginit(self, _xapian.new_ExpandDeciderAnd(first_, second_))
        __swig_destroy__ = _xapian.delete_ExpandDeciderAnd
    ExpandDeciderAnd_swigregister = _xapian.ExpandDeciderAnd_swigregister
    ExpandDeciderAnd_swigregister(ExpandDeciderAnd)

    class ExpandDeciderFilterPrefix(ExpandDecider):
        """

        ExpandDecider subclass which restrict terms to a particular prefix.

        ExpandDeciderFilterPrefix provides an easy way to choose terms with a
        particular prefix when generating an ESet.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, prefix_):
            """

            The parameter specify the prefix of terms to be retained.

            Xapian::ExpandDeciderFilterPrefix::ExpandDeciderFilterPrefix(const
            std::string &prefix_)

            Parameters:
            -----------

            prefix_:  restrict terms to the particular prefix_
            """
            _xapian.ExpandDeciderFilterPrefix_swiginit(self, _xapian.new_ExpandDeciderFilterPrefix(prefix_))
        __swig_destroy__ = _xapian.delete_ExpandDeciderFilterPrefix
    ExpandDeciderFilterPrefix_swigregister = _xapian.ExpandDeciderFilterPrefix_swigregister
    ExpandDeciderFilterPrefix_swigregister(ExpandDeciderFilterPrefix)

    class KeyMaker(object):
        """

        Virtual base class for key making functors.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor.

            Xapian::KeyMaker::KeyMaker()
            """
            if self.__class__ == KeyMaker:
                _self = None
            else:
                _self = self
            _xapian.KeyMaker_swiginit(self, _xapian.new_KeyMaker(_self, ))
        __swig_destroy__ = _xapian.delete_KeyMaker

        def release(self):
            """

            Start reference counting this object.

            const KeyMaker* Xapian::KeyMaker::release() const

            You can hand ownership of a dynamically allocated KeyMaker object to
            Xapian by calling release() and then passing the object to a Xapian
            method. Xapian will arrange to delete the object once it is no longer
            required.
            """
            return _xapian.KeyMaker_release(self)

        def __disown__(self):
            self.this.disown()
            _xapian.disown_KeyMaker(self)
            return weakref_proxy(self)
    KeyMaker.__call__ = new_instancemethod(_xapian.KeyMaker___call__, None, KeyMaker)
    KeyMaker.release = new_instancemethod(_xapian.KeyMaker_release, None, KeyMaker)
    KeyMaker_swigregister = _xapian.KeyMaker_swigregister
    KeyMaker_swigregister(KeyMaker)

    class MultiValueKeyMaker(KeyMaker):
        """

        KeyMaker subclass which combines several values.

        When the result is used for sorting, results are ordered by the first
        value. In the event of a tie, the second is used. If this is the same
        for both, the third is used, and so on. If reverse is true for a
        value, then the sort order for that value is reversed.

        When used for collapsing, the documents will only be considered equal
        if all the values specified match. If none of the specified values are
        set then the generated key will be empty, so such documents won't be
        collapsed (which is consistent with the behaviour in the "collapse on
        a value" case). If you'd prefer that documents with none of the keys
        set are collapsed together, then you can set reverse for at least one
        of the values. Other than this, it isn't useful to set reverse for
        collapsing.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Construct a MultiValueKeyMaker from a pair of iterators.

            Xapian::MultiValueKeyMaker::MultiValueKeyMaker(Iterator begin,
            Iterator end)

            The iterators must be a begin/end pair returning Xapian::valueno (or a
            compatible type) when dereferenced.
            """
            _xapian.MultiValueKeyMaker_swiginit(self, _xapian.new_MultiValueKeyMaker())

        def add_value(self, *args):
            """

            Add a value slot to the list to build a key from.

            void Xapian::MultiValueKeyMaker::add_value(Xapian::valueno slot, bool
            reverse=false, const std::string &defvalue=std::string())

            Parameters:
            -----------

            slot:  The value slot to add

            reverse:  Adjust values from this slot to reverse their sort order
            (default: false)

            defvalue:  Value to use for documents which don't have a value set in
            this slot (default: empty). This can be used to make such documents
            sort after all others by passing get_value_upper_bound(slot) + "x"
            this is guaranteed to be greater than any value in this slot.
            """
            return _xapian.MultiValueKeyMaker_add_value(self, *args)

        __swig_destroy__ = _xapian.delete_MultiValueKeyMaker
    MultiValueKeyMaker.add_value = new_instancemethod(_xapian.MultiValueKeyMaker_add_value, None, MultiValueKeyMaker)
    MultiValueKeyMaker_swigregister = _xapian.MultiValueKeyMaker_swigregister
    MultiValueKeyMaker_swigregister(MultiValueKeyMaker)

    RP_SUFFIX = _xapian.RP_SUFFIX
    RP_REPEATED = _xapian.RP_REPEATED
    RP_DATE_PREFER_MDY = _xapian.RP_DATE_PREFER_MDY
    class Stopper(object):
        """

        Base class for stop-word decision functor.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor.

            Xapian::Stopper::Stopper()
            """
            if self.__class__ == Stopper:
                _self = None
            else:
                _self = self
            _xapian.Stopper_swiginit(self, _xapian.new_Stopper(_self, ))
        __swig_destroy__ = _xapian.delete_Stopper

        def __str__(self):
            """

            Return a string describing this object.

            virtual std::string Xapian::Stopper::get_description() const
            """
            return _xapian.Stopper___str__(self)

        def release(self):
            """

            Start reference counting this object.

            const Stopper* Xapian::Stopper::release() const

            You can hand ownership of a dynamically allocated Stopper object to
            Xapian by calling release() and then passing the object to a Xapian
            method. Xapian will arrange to delete the object once it is no longer
            required.
            """
            return _xapian.Stopper_release(self)

        def __disown__(self):
            self.this.disown()
            _xapian.disown_Stopper(self)
            return weakref_proxy(self)
    Stopper.__call__ = new_instancemethod(_xapian.Stopper___call__, None, Stopper)
    Stopper.__str__ = new_instancemethod(_xapian.Stopper___str__, None, Stopper)
    Stopper.release = new_instancemethod(_xapian.Stopper_release, None, Stopper)
    Stopper_swigregister = _xapian.Stopper_swigregister
    Stopper_swigregister(Stopper)

    class SimpleStopper(Stopper):
        """

        Simple implementation of Stopper class - this will suit most users.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def add(self, word):
            """

            Add a single stop word.

            void Xapian::SimpleStopper::add(const std::string &word)
            """
            return _xapian.SimpleStopper_add(self, word)

        def __init__(self, *args):
            """

            Initialise from a pair of iterators.

            Xapian::SimpleStopper::SimpleStopper(Iterator begin, Iterator end)

            Xapian includes stop list files for many languages. You can initialise
            from a file like that:
            """
            _xapian.SimpleStopper_swiginit(self, _xapian.new_SimpleStopper(*args))
        __swig_destroy__ = _xapian.delete_SimpleStopper
    SimpleStopper.add = new_instancemethod(_xapian.SimpleStopper_add, None, SimpleStopper)
    SimpleStopper_swigregister = _xapian.SimpleStopper_swigregister
    SimpleStopper_swigregister(SimpleStopper)

    class RangeProcessor(object):
        """

        Base class for range processors.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Constructor.

            Xapian::RangeProcessor::RangeProcessor(Xapian::valueno slot_, const
            std::string &str_=std::string(), unsigned flags_=0)

            Parameters:
            -----------

            slot_:  Which value slot to generate ranges over.

            str_:  A string to look for to recognise values as belonging to this
            range (as a prefix by default, or as a suffix if flags
            Xapian::RP_SUFFIX is specified).

            flags_:  Zero or more of the following flags, combined with bitwise-or
            (| in C++): Xapian::RP_SUFFIX - require str_ as a suffix instead of a
            prefix.

            Xapian::RP_REPEATED - optionally allow str_ on both ends of the range
            - e.g. $1..$10 or 5m..50m. By default a prefix is only checked for on
            the start (e.g. date:1/1/1980..31/12/1989), and a suffix only on the
            end (e.g. 2..12kg).
            """
            if self.__class__ == RangeProcessor:
                _self = None
            else:
                _self = self
            _xapian.RangeProcessor_swiginit(self, _xapian.new_RangeProcessor(_self, *args))
        __swig_destroy__ = _xapian.delete_RangeProcessor

        def check_range(self, b, e):
            """

            Check prefix/suffix on range.

            Xapian::Query Xapian::RangeProcessor::check_range(const std::string
            &b, const std::string &e)

            If they match, remove the prefix/suffix and then call operator()() to
            try to handle the range.
            """
            return _xapian.RangeProcessor_check_range(self, b, e)

        def release(self):
            """

            Start reference counting this object.

            const RangeProcessor* Xapian::RangeProcessor::release() const

            You can hand ownership of a dynamically allocated RangeProcessor
            object to Xapian by calling release() and then passing the object to a
            Xapian method. Xapian will arrange to delete the object once it is no
            longer required.
            """
            return _xapian.RangeProcessor_release(self)

        def __disown__(self):
            self.this.disown()
            _xapian.disown_RangeProcessor(self)
            return weakref_proxy(self)
    RangeProcessor.check_range = new_instancemethod(_xapian.RangeProcessor_check_range, None, RangeProcessor)
    RangeProcessor.__call__ = new_instancemethod(_xapian.RangeProcessor___call__, None, RangeProcessor)
    RangeProcessor.release = new_instancemethod(_xapian.RangeProcessor_release, None, RangeProcessor)
    RangeProcessor_swigregister = _xapian.RangeProcessor_swigregister
    RangeProcessor_swigregister(RangeProcessor)

    class DateRangeProcessor(RangeProcessor):
        """

        Handle a date range.

        Begin and end must be dates in a recognised format.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Constructor.

            Xapian::DateRangeProcessor::DateRangeProcessor(Xapian::valueno slot_,
            const std::string &str_, unsigned flags_=0, int epoch_year_=1970)

            Parameters:
            -----------

            slot_:  The value slot number to query.

            str_:  A string to look for to recognise values as belonging to this
            date range.

            flags_:  Zero or more of the following flags, combined with bitwise-
            or: Xapian::RP_SUFFIX - require str_ as a suffix instead of a prefix.

            Xapian::RP_REPEATED - optionally allow str_ on both ends of the range
            - e.g. $1..$10 or 5m..50m. By default a prefix is only checked for on
            the start (e.g. date:1/1/1980..31/12/1989), and a suffix only on the
            end (e.g. 2..12kg).

            Xapian::RP_DATE_PREFER_MDY - interpret ambiguous dates as
            month/day/year rather than day/month/year.

            epoch_year_:  Year to use as the epoch for dates with 2 digit years
            (default: 1970, so 1/1/69 is 2069 while 1/1/70 is 1970).

            The string supplied in str_ is used by operator() to decide whether
            the pair of strings supplied to it constitute a valid range. If
            prefix_ is true, the first value in a range must begin with str_ (and
            the second value may optionally begin with str_); if prefix_ is false,
            the second value in a range must end with str_ (and the first value
            may optionally end with str_).

            If str_ is empty, the Xapian::RP_SUFFIX and Xapian::RP_REPEATED are
            irrelevant, and no special strings are required at the start or end of
            the strings defining the range.

            The remainder of both strings defining the endpoints must be valid
            dates.

            For example, if str_ is "created:", Xapian::RP_SUFFIX is not
            specified, and the range processor has been added to the queryparser,
            the queryparser will accept "created:1/1/2000..31/12/2001".
            """
            _xapian.DateRangeProcessor_swiginit(self, _xapian.new_DateRangeProcessor(*args))
        __swig_destroy__ = _xapian.delete_DateRangeProcessor
    DateRangeProcessor_swigregister = _xapian.DateRangeProcessor_swigregister
    DateRangeProcessor_swigregister(DateRangeProcessor)

    class NumberRangeProcessor(RangeProcessor):
        """

        Handle a number range.

        This class must be used on values which have been encoded using
        Xapian::sortable_serialise() which turns numbers into strings which
        will sort in the same order as the numbers (the same values can be
        used to implement a numeric sort).
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Constructor.

            Xapian::NumberRangeProcessor::NumberRangeProcessor(Xapian::valueno
            slot_, const std::string &str_=std::string(), unsigned flags_=0)

            Parameters:
            -----------

            slot_:  The value slot number to query.

            str_:  A string to look for to recognise values as belonging to this
            numeric range.

            flags_:  Zero or more of the following flags, combined with bitwise-
            or: Xapian::RP_SUFFIX - require str_ as a suffix instead of a prefix.

            Xapian::RP_REPEATED - optionally allow str_ on both ends of the range
            - e.g. $1..$10 or 5m..50m. By default a prefix is only checked for on
            the start (e.g. date:1/1/1980..31/12/1989), and a suffix only on the
            end (e.g. 2..12kg).

            The string supplied in str_ is used by operator() to decide whether
            the pair of strings supplied to it constitute a valid range. If
            prefix_ is true, the first value in a range must begin with str_ (and
            the second value may optionally begin with str_); if prefix_ is false,
            the second value in a range must end with str_ (and the first value
            may optionally end with str_).

            If str_ is empty, the setting of prefix_ is irrelevant, and no special
            strings are required at the start or end of the strings defining the
            range.

            The remainder of both strings defining the endpoints must be valid
            floating point numbers. (FIXME: define format recognised).

            For example, if str_ is "$" and prefix_ is true, and the range
            processor has been added to the queryparser, the queryparser will
            accept "$10..50" or "$10..$50", but not "10..50" or "10..$50"
            as valid ranges. If str_ is "kg" and prefix_ is false, the
            queryparser will accept "10..50kg" or "10kg..50kg", but not
            "10..50" or "10kg..50" as valid ranges.
            """
            _xapian.NumberRangeProcessor_swiginit(self, _xapian.new_NumberRangeProcessor(*args))
        __swig_destroy__ = _xapian.delete_NumberRangeProcessor
    NumberRangeProcessor_swigregister = _xapian.NumberRangeProcessor_swigregister
    NumberRangeProcessor_swigregister(NumberRangeProcessor)

    class ValueRangeProcessor(object):
        """

        Base class for value range processors.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor.

            Xapian::ValueRangeProcessor::ValueRangeProcessor()
            """
            if self.__class__ == ValueRangeProcessor:
                _self = None
            else:
                _self = self
            _xapian.ValueRangeProcessor_swiginit(self, _xapian.new_ValueRangeProcessor(_self, ))
        __swig_destroy__ = _xapian.delete_ValueRangeProcessor

        def release(self):
            """

            Start reference counting this object.

            const ValueRangeProcessor* Xapian::ValueRangeProcessor::release()
            const

            You can hand ownership of a dynamically allocated ValueRangeProcessor
            object to Xapian by calling release() and then passing the object to a
            Xapian method. Xapian will arrange to delete the object once it is no
            longer required.
            """
            return _xapian.ValueRangeProcessor_release(self)

        def __disown__(self):
            self.this.disown()
            _xapian.disown_ValueRangeProcessor(self)
            return weakref_proxy(self)
    ValueRangeProcessor.__call__ = new_instancemethod(_xapian.ValueRangeProcessor___call__, None, ValueRangeProcessor)
    ValueRangeProcessor.release = new_instancemethod(_xapian.ValueRangeProcessor_release, None, ValueRangeProcessor)
    ValueRangeProcessor_swigregister = _xapian.ValueRangeProcessor_swigregister
    ValueRangeProcessor_swigregister(ValueRangeProcessor)

    class StringValueRangeProcessor(ValueRangeProcessor):
        """

        Handle a string range.

        The end points can be any strings.

        Deprecated Use Xapian::RangeProcessor instead (added in 1.3.6).
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Constructor.

            Xapian::StringValueRangeProcessor::StringValueRangeProcessor(Xapian::valueno
            slot_, const std::string &str_, bool prefix_=true)

            Parameters:
            -----------

            slot_:  The value number to return from operator().

            str_:  A string to look for to recognise values as belonging to this
            range.

            prefix_:  Flag specifying whether to check for str_ as a prefix or a
            suffix.
            """
            _xapian.StringValueRangeProcessor_swiginit(self, _xapian.new_StringValueRangeProcessor(*args))
        __swig_destroy__ = _xapian.delete_StringValueRangeProcessor
    StringValueRangeProcessor_swigregister = _xapian.StringValueRangeProcessor_swigregister
    StringValueRangeProcessor_swigregister(StringValueRangeProcessor)

    class DateValueRangeProcessor(StringValueRangeProcessor):
        """

        Handle a date range.

        Begin and end must be dates in a recognised format.

        Deprecated Use Xapian::DateRangeProcessor instead (added in 1.3.6).
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Constructor.

            Xapian::DateValueRangeProcessor::DateValueRangeProcessor(Xapian::valueno
            slot_, const char *str_, bool prefix_=true, bool prefer_mdy_=false,
            int epoch_year_=1970)

            This is like the previous version, but with const char * instead of
            std::string - we need this overload as otherwise
            DateValueRangeProcessor(1, "date:") quietly interprets the second
            argument as a boolean in preference to std::string. If you want to be
            compatible with 1.2.12 and earlier, then explicitly convert to
            std::string, i.e.: DateValueRangeProcessor(1, std::string("date:"))

            Parameters:
            -----------

            slot_:  The value number to return from operator().

            str_:  A string to look for to recognise values as belonging to this
            date range.

            prefix_:  Whether to look for the string at the start or end of the
            values. If true, the string is a prefix; if false, the string is a
            suffix (default: true).

            prefer_mdy_:  Should ambiguous dates be interpreted as month/day/year
            rather than day/month/year? (default: false)

            epoch_year_:  Year to use as the epoch for dates with 2 digit years
            (default: 1970, so 1/1/69 is 2069 while 1/1/70 is 1970).

            The string supplied in str_ is used by operator() to decide whether
            the pair of strings supplied to it constitute a valid range. If
            prefix_ is true, the first value in a range must begin with str_ (and
            the second value may optionally begin with str_); if prefix_ is false,
            the second value in a range must end with str_ (and the first value
            may optionally end with str_).

            If str_ is empty, the setting of prefix_ is irrelevant, and no special
            strings are required at the start or end of the strings defining the
            range.

            The remainder of both strings defining the endpoints must be valid
            dates.

            For example, if str_ is "created:" and prefix_ is true, and the
            range processor has been added to the queryparser, the queryparser
            will accept "created:1/1/2000..31/12/2001".
            """
            _xapian.DateValueRangeProcessor_swiginit(self, _xapian.new_DateValueRangeProcessor(*args))
        __swig_destroy__ = _xapian.delete_DateValueRangeProcessor
    DateValueRangeProcessor_swigregister = _xapian.DateValueRangeProcessor_swigregister
    DateValueRangeProcessor_swigregister(DateValueRangeProcessor)

    class NumberValueRangeProcessor(StringValueRangeProcessor):
        """

        Handle a number range.

        This class must be used on values which have been encoded using
        Xapian::sortable_serialise() which turns numbers into strings which
        will sort in the same order as the numbers (the same values can be
        used to implement a numeric sort).

        Deprecated Use Xapian::NumberRangeProcessor instead (added in 1.3.6).

        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Constructor.

            Xapian::NumberValueRangeProcessor::NumberValueRangeProcessor(Xapian::valueno
            slot_, const std::string &str_, bool prefix_=true)

            Parameters:
            -----------

            slot_:  The value number to return from operator().

            str_:  A string to look for to recognise values as belonging to this
            numeric range.

            prefix_:  Whether to look for the string at the start or end of the
            values. If true, the string is a prefix; if false, the string is a
            suffix (default: true).

            The string supplied in str_ is used by operator() to decide whether
            the pair of strings supplied to it constitute a valid range. If
            prefix_ is true, the first value in a range must begin with str_ (and
            the second value may optionally begin with str_); if prefix_ is false,
            the second value in a range must end with str_ (and the first value
            may optionally end with str_).

            If str_ is empty, the setting of prefix_ is irrelevant, and no special
            strings are required at the start or end of the strings defining the
            range.

            The remainder of both strings defining the endpoints must be valid
            floating point numbers. (FIXME: define format recognised).

            For example, if str_ is "$" and prefix_ is true, and the range
            processor has been added to the queryparser, the queryparser will
            accept "$10..50" or "$10..$50", but not "10..50" or "10..$50"
            as valid ranges. If str_ is "kg" and prefix_ is false, the
            queryparser will accept "10..50kg" or "10kg..50kg", but not
            "10..50" or "10kg..50" as valid ranges.
            """
            _xapian.NumberValueRangeProcessor_swiginit(self, _xapian.new_NumberValueRangeProcessor(*args))
        __swig_destroy__ = _xapian.delete_NumberValueRangeProcessor
    NumberValueRangeProcessor_swigregister = _xapian.NumberValueRangeProcessor_swigregister
    NumberValueRangeProcessor_swigregister(NumberValueRangeProcessor)

    class FieldProcessor(object):
        """

        Base class for field processors.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor.

            Xapian::FieldProcessor::FieldProcessor()
            """
            if self.__class__ == FieldProcessor:
                _self = None
            else:
                _self = self
            _xapian.FieldProcessor_swiginit(self, _xapian.new_FieldProcessor(_self, ))
        __swig_destroy__ = _xapian.delete_FieldProcessor

        def release(self):
            """

            Start reference counting this object.

            const FieldProcessor* Xapian::FieldProcessor::release() const

            You can hand ownership of a dynamically allocated FieldProcessor
            object to Xapian by calling release() and then passing the object to a
            Xapian method. Xapian will arrange to delete the object once it is no
            longer required.
            """
            return _xapian.FieldProcessor_release(self)

        def __disown__(self):
            self.this.disown()
            _xapian.disown_FieldProcessor(self)
            return weakref_proxy(self)
    FieldProcessor.__call__ = new_instancemethod(_xapian.FieldProcessor___call__, None, FieldProcessor)
    FieldProcessor.release = new_instancemethod(_xapian.FieldProcessor_release, None, FieldProcessor)
    FieldProcessor_swigregister = _xapian.FieldProcessor_swigregister
    FieldProcessor_swigregister(FieldProcessor)

    class QueryParser(object):
        """

        Build a Xapian::Query object from a user query string.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr
        FLAG_BOOLEAN = _xapian.QueryParser_FLAG_BOOLEAN
        FLAG_PHRASE = _xapian.QueryParser_FLAG_PHRASE
        FLAG_LOVEHATE = _xapian.QueryParser_FLAG_LOVEHATE
        FLAG_BOOLEAN_ANY_CASE = _xapian.QueryParser_FLAG_BOOLEAN_ANY_CASE
        FLAG_WILDCARD = _xapian.QueryParser_FLAG_WILDCARD
        FLAG_PURE_NOT = _xapian.QueryParser_FLAG_PURE_NOT
        FLAG_PARTIAL = _xapian.QueryParser_FLAG_PARTIAL
        FLAG_SPELLING_CORRECTION = _xapian.QueryParser_FLAG_SPELLING_CORRECTION
        FLAG_SYNONYM = _xapian.QueryParser_FLAG_SYNONYM
        FLAG_AUTO_SYNONYMS = _xapian.QueryParser_FLAG_AUTO_SYNONYMS
        FLAG_AUTO_MULTIWORD_SYNONYMS = _xapian.QueryParser_FLAG_AUTO_MULTIWORD_SYNONYMS
        FLAG_CJK_NGRAM = _xapian.QueryParser_FLAG_CJK_NGRAM
        FLAG_DEFAULT = _xapian.QueryParser_FLAG_DEFAULT
        STEM_NONE = _xapian.QueryParser_STEM_NONE
        STEM_SOME = _xapian.QueryParser_STEM_SOME
        STEM_ALL = _xapian.QueryParser_STEM_ALL
        STEM_ALL_Z = _xapian.QueryParser_STEM_ALL_Z
        STEM_SOME_FULL_POS = _xapian.QueryParser_STEM_SOME_FULL_POS

        def __init__(self):
            """

            Default constructor.

            Xapian::QueryParser::QueryParser()
            """
            _xapian.QueryParser_swiginit(self, _xapian.new_QueryParser())
        __swig_destroy__ = _xapian.delete_QueryParser

        def set_stemmer(self, stemmer):
            """

            Set the stemmer.

            void Xapian::QueryParser::set_stemmer(const Xapian::Stem &stemmer)

            This sets the stemming algorithm which will be used by the query
            parser. The stemming algorithm will be used according to the stemming
            strategy set by set_stemming_strategy(). As of 1.3.1, this defaults to
            STEM_SOME, but in earlier versions the default was STEM_NONE. If you
            want to work with older versions, you should explicitly set a stemming
            strategy as well as setting a stemmer, otherwise your stemmer won't
            actually be used.

            Parameters:
            -----------

            stemmer:  The Xapian::Stem object to set.
            """
            return _xapian.QueryParser_set_stemmer(self, stemmer)

        def set_stemming_strategy(self, strategy):
            """

            Set the stemming strategy.

            void Xapian::QueryParser::set_stemming_strategy(stem_strategy
            strategy)

            This controls how the query parser will apply the stemming algorithm.
            Note that the stemming algorithm is only applied to words in free-text
            fields - boolean filter terms are never stemmed.

            Parameters:
            -----------

            strategy:  The strategy to use - possible values are: STEM_NONE: Don't
            perform any stemming. (default in Xapian <= 1.3.0)

            STEM_SOME: Stem all terms except for those which start with a capital
            letter, or are followed by certain characters (currently: (/@<>=*[{"
            ), or are used with operators which need positional information.
            Stemmed terms are prefixed with 'Z'. (default in Xapian >= 1.3.1)

            STEM_SOME_FULL_POS: Like STEM_SOME but also stems terms used with
            operators which need positional information. Added in Xapian 1.4.8.

            STEM_ALL: Stem all terms (note: no 'Z' prefix is added).

            STEM_ALL_Z: Stem all terms (note: 'Z' prefix is added). (new in Xapian
            1.2.11 and 1.3.1)
            """
            return _xapian.QueryParser_set_stemming_strategy(self, strategy)

        def set_stopper(self, stop=None):
            """

            Set the stopper.

            void Xapian::QueryParser::set_stopper(const Stopper *stop=NULL)

            Parameters:
            -----------

            stop:  The Stopper object to set (default NULL, which means no
            stopwords).
            """
            return _xapian.QueryParser_set_stopper(self, stop)

        def set_default_op(self, default_op):
            """

            Set the default operator.

            void Xapian::QueryParser::set_default_op(Query::op default_op)

            Parameters:
            -----------

            default_op:  The operator to use to combine non-filter query items
            when no explicit operator is used.

            So for example, 'weather forecast' is parsed as if it were 'weather OR
            forecast' by default.

            The most useful values for this are OP_OR (the default) and OP_AND.
            OP_NEAR, OP_PHRASE, OP_ELITE_SET, OP_SYNONYM and OP_MAX are also
            permitted. Passing other values will result in InvalidArgumentError
            being thrown.
            """
            return _xapian.QueryParser_set_default_op(self, default_op)

        def get_default_op(self):
            """

            Get the current default operator.

            Query::op Xapian::QueryParser::get_default_op() const
            """
            return _xapian.QueryParser_get_default_op(self)

        def set_database(self, db):
            """

            Specify the database being searched.

            void Xapian::QueryParser::set_database(const Database &db)

            Parameters:
            -----------

            db:  The database to use for spelling correction
            (FLAG_SPELLING_CORRECTION), and synonyms (FLAG_SYNONYM,
            FLAG_AUTO_SYNONYMS, and FLAG_AUTO_MULTIWORD_SYNONYMS).
            """
            return _xapian.QueryParser_set_database(self, db)

        def set_max_expansion(self, *args):
            """

            Specify the maximum expansion of a wildcard and/or partial term.

            void Xapian::QueryParser::set_max_expansion(Xapian::termcount
            max_expansion, int max_type=Xapian::Query::WILDCARD_LIMIT_ERROR,
            unsigned flags=FLAG_WILDCARD|FLAG_PARTIAL)

            Note: you must also set FLAG_WILDCARD and/or FLAG_PARTIAL in the flags
            parameter to  parse_query() for this setting to have anything to
            affect.

            If you don't call this method, the default settings are no limit on
            wildcard expansion, and partial terms expanding to the most frequent
            100 terms - i.e. as if you'd called:

            set_max_expansion(0); set_max_expansion(100,
            Xapian::Query::WILDCARD_LIMIT_MOST_FREQUENT,
            Xapian::QueryParser::FLAG_PARTIAL);

            Parameters:
            -----------

            max_expansion:  The maximum number of terms each wildcard in the query
            can expand to, or 0 for no limit (which is the default).

            max_type:    Xapian::Query::WILDCARD_LIMIT_ERROR,
            Xapian::Query::WILDCARD_LIMIT_FIRST or
            Xapian::Query::WILDCARD_LIMIT_MOST_FREQUENT (default:
            Xapian::Query::WILDCARD_LIMIT_ERROR).

            flags:  What to set the limit for (default:
            FLAG_WILDCARD|FLAG_PARTIAL, setting the limit for both wildcards and
            partial terms).

            1.3.3
            """
            return _xapian.QueryParser_set_max_expansion(self, *args)

        def set_max_wildcard_expansion(self, arg2):
            """

            Specify the maximum expansion of a wildcard.

            void
            Xapian::QueryParser::set_max_wildcard_expansion(Xapian::termcount)

            If any wildcard expands to more than max_expansion terms, an exception
            will be thrown.

            This method is provided for API compatibility with Xapian 1.2.x and is
            deprecated - replace it with:

            set_max_wildcard_expansion(max_expansion,
            Xapian::Query::WILDCARD_LIMIT_ERROR,
            Xapian::QueryParser::FLAG_WILDCARD);
            """
            return _xapian.QueryParser_set_max_wildcard_expansion(self, arg2)

        def parse_query(self, *args):
            """

            Parse a query.

            Query Xapian::QueryParser::parse_query(const std::string
            &query_string, unsigned flags=FLAG_DEFAULT, const std::string
            &default_prefix=std::string())

            Parameters:
            -----------

            query_string:  A free-text query as entered by a user

            flags:  Zero or more QueryParser::feature_flag specifying what
            features the QueryParser should support. Combine multiple values with
            bitwise-or (|) (default FLAG_DEFAULT).

            default_prefix:  The default term prefix to use (default none). For
            example, you can pass "A" when parsing an "Author" field.

            Parameters:
            -----------

            If:  the query string can't be parsed, then Xapian::QueryParserError
            is thrown. You can get an English error message to report to the user
            by catching it and calling get_msg() on the caught exception. The
            current possible values (in case you want to translate them) are:

            Unknown range operation

            parse error

            Syntax: <expression> AND <expression>

            Syntax: <expression> AND NOT <expression>

            Syntax: <expression> NOT <expression>

            Syntax: <expression> OR <expression>

            Syntax: <expression> XOR <expression>
            """
            return _xapian.QueryParser_parse_query(self, *args)

        def add_prefix(self, *args):
            """

            Register a FieldProcessor.

            void Xapian::QueryParser::add_prefix(const std::string &field,
            Xapian::FieldProcessor *proc)
            """
            return _xapian.QueryParser_add_prefix(self, *args)

        def add_boolean_prefix(self, *args):
            """

            Register a FieldProcessor for a boolean prefix.

            void Xapian::QueryParser::add_boolean_prefix(const std::string &field,
            Xapian::FieldProcessor *proc, bool exclusive)

            This is an older version of this method - use the version with the
            grouping parameter in preference to this one.
            """
            return _xapian.QueryParser_add_boolean_prefix(self, *args)

        def _stoplist_begin(self):
            """

            Begin iterator over terms omitted from the query as stopwords.

            TermIterator Xapian::QueryParser::stoplist_begin() const
            """
            return _xapian.QueryParser__stoplist_begin(self)

        def _stoplist_end(self):
            """

            End iterator over terms omitted from the query as stopwords.

            TermIterator Xapian::QueryParser::stoplist_end() const
            """
            return _xapian.QueryParser__stoplist_end(self)

        def _unstem_begin(self, term):
            """

            Begin iterator over unstemmed forms of the given stemmed query term.

            TermIterator Xapian::QueryParser::unstem_begin(const std::string
            &term) const
            """
            return _xapian.QueryParser__unstem_begin(self, term)

        def _unstem_end(self, arg2):
            """

            End iterator over unstemmed forms of the given stemmed query term.

            TermIterator Xapian::QueryParser::unstem_end(const std::string &)
            const
            """
            return _xapian.QueryParser__unstem_end(self, arg2)

        def add_rangeprocessor(self, range_proc, grouping=None):
            """

            Register a RangeProcessor.

            void Xapian::QueryParser::add_rangeprocessor(Xapian::RangeProcessor
            *range_proc, const std::string *grouping=NULL)
            """
            return _xapian.QueryParser_add_rangeprocessor(self, range_proc, grouping)

        def add_valuerangeprocessor(self, vrproc):
            """

            Register a ValueRangeProcessor.

            void
            Xapian::QueryParser::add_valuerangeprocessor(Xapian::ValueRangeProcessor
            *vrproc)

            This method is provided for API compatibility with Xapian 1.2.x and is
            deprecated - use  add_rangeprocessor() with a RangeProcessor instead.

            Compatibility shim.
            """
            return _xapian.QueryParser_add_valuerangeprocessor(self, vrproc)

        def get_corrected_query_string(self):
            """

            Get the spelling-corrected query string.

            std::string Xapian::QueryParser::get_corrected_query_string() const

            This will only be set if FLAG_SPELLING_CORRECTION is specified when
            QueryParser::parse_query() was last called.

            If there were no corrections, an empty string is returned.
            """
            return _xapian.QueryParser_get_corrected_query_string(self)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::QueryParser::get_description() const
            """
            return _xapian.QueryParser___str__(self)

    QueryParser.set_stemmer = new_instancemethod(_xapian.QueryParser_set_stemmer, None, QueryParser)
    QueryParser.set_stemming_strategy = new_instancemethod(_xapian.QueryParser_set_stemming_strategy, None, QueryParser)
    QueryParser.set_stopper = new_instancemethod(_xapian.QueryParser_set_stopper, None, QueryParser)
    QueryParser.set_default_op = new_instancemethod(_xapian.QueryParser_set_default_op, None, QueryParser)
    QueryParser.get_default_op = new_instancemethod(_xapian.QueryParser_get_default_op, None, QueryParser)
    QueryParser.set_database = new_instancemethod(_xapian.QueryParser_set_database, None, QueryParser)
    QueryParser.set_max_expansion = new_instancemethod(_xapian.QueryParser_set_max_expansion, None, QueryParser)
    QueryParser.set_max_wildcard_expansion = new_instancemethod(_xapian.QueryParser_set_max_wildcard_expansion, None, QueryParser)
    QueryParser.parse_query = new_instancemethod(_xapian.QueryParser_parse_query, None, QueryParser)
    QueryParser.add_prefix = new_instancemethod(_xapian.QueryParser_add_prefix, None, QueryParser)
    QueryParser.add_boolean_prefix = new_instancemethod(_xapian.QueryParser_add_boolean_prefix, None, QueryParser)
    QueryParser._stoplist_begin = new_instancemethod(_xapian.QueryParser__stoplist_begin, None, QueryParser)
    QueryParser._stoplist_end = new_instancemethod(_xapian.QueryParser__stoplist_end, None, QueryParser)
    QueryParser._unstem_begin = new_instancemethod(_xapian.QueryParser__unstem_begin, None, QueryParser)
    QueryParser._unstem_end = new_instancemethod(_xapian.QueryParser__unstem_end, None, QueryParser)
    QueryParser.add_rangeprocessor = new_instancemethod(_xapian.QueryParser_add_rangeprocessor, None, QueryParser)
    QueryParser.add_valuerangeprocessor = new_instancemethod(_xapian.QueryParser_add_valuerangeprocessor, None, QueryParser)
    QueryParser.get_corrected_query_string = new_instancemethod(_xapian.QueryParser_get_corrected_query_string, None, QueryParser)
    QueryParser.__str__ = new_instancemethod(_xapian.QueryParser___str__, None, QueryParser)
    QueryParser_swigregister = _xapian.QueryParser_swigregister
    QueryParser_swigregister(QueryParser)

    def sortable_serialise(value):
        return _xapian.sortable_serialise(value)
    sortable_serialise = _xapian.sortable_serialise

    def sortable_unserialise(serialised):
        return _xapian.sortable_unserialise(serialised)
    sortable_unserialise = _xapian.sortable_unserialise
    class ValueSetMatchDecider(MatchDecider):
        """

        MatchDecider filtering results based on whether document values are in
        a user- defined set.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, slot, inclusive_):
            """

            Construct a ValueSetMatchDecider.

            Xapian::ValueSetMatchDecider::ValueSetMatchDecider(Xapian::valueno
            slot, bool inclusive_)

            Parameters:
            -----------

            slot:  The value slot number to look in.

            inclusive_:  If true, match decider accepts documents which have a
            value in the specified slot which is a member of the test set; if
            false, match decider accepts documents which do not have a value in
            the specified slot.
            """
            _xapian.ValueSetMatchDecider_swiginit(self, _xapian.new_ValueSetMatchDecider(slot, inclusive_))

        def add_value(self, value):
            """

            Add a value to the test set.

            void Xapian::ValueSetMatchDecider::add_value(const std::string &value)

            Parameters:
            -----------

            value:  The value to add to the test set.
            """
            return _xapian.ValueSetMatchDecider_add_value(self, value)

        def remove_value(self, value):
            """

            Remove a value from the test set.

            void Xapian::ValueSetMatchDecider::remove_value(const std::string
            &value)

            Parameters:
            -----------

            value:  The value to remove from the test set.
            """
            return _xapian.ValueSetMatchDecider_remove_value(self, value)

        __swig_destroy__ = _xapian.delete_ValueSetMatchDecider
    ValueSetMatchDecider.add_value = new_instancemethod(_xapian.ValueSetMatchDecider_add_value, None, ValueSetMatchDecider)
    ValueSetMatchDecider.remove_value = new_instancemethod(_xapian.ValueSetMatchDecider_remove_value, None, ValueSetMatchDecider)
    ValueSetMatchDecider_swigregister = _xapian.ValueSetMatchDecider_swigregister
    ValueSetMatchDecider_swigregister(ValueSetMatchDecider)

    class Weight(object):
        """

        Abstract base class for weighting schemes.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')

        def __init__(self, *args, **kwargs):
            raise AttributeError("No constructor defined - class is abstract")
        __repr__ = _swig_repr
        TWO_STAGE_SMOOTHING = _xapian.Weight_TWO_STAGE_SMOOTHING
        DIRICHLET_SMOOTHING = _xapian.Weight_DIRICHLET_SMOOTHING
        ABSOLUTE_DISCOUNT_SMOOTHING = _xapian.Weight_ABSOLUTE_DISCOUNT_SMOOTHING
        JELINEK_MERCER_SMOOTHING = _xapian.Weight_JELINEK_MERCER_SMOOTHING
        DIRICHLET_PLUS_SMOOTHING = _xapian.Weight_DIRICHLET_PLUS_SMOOTHING
        __swig_destroy__ = _xapian.delete_Weight

        def name(self):
            """

            Return the name of this weighting scheme.

            virtual std::string Xapian::Weight::name() const

            This name is used by the remote backend. It is passed along with the
            serialised parameters to the remote server so that it knows which
            class to create.

            Return the full namespace-qualified name of your class here - if your
            class is called FooWeight, return "FooWeight" from this method (
            Xapian::BM25Weight returns "Xapian::BM25Weight" here).

            If you don't want to support the remote backend, you can use the
            default implementation which simply returns an empty string.
            """
            return _xapian.Weight_name(self)

        def get_sumpart(self, wdf, doclen, uniqterms):
            """

            Calculate the weight contribution for this object's term to a
            document.

            virtual double Xapian::Weight::get_sumpart(Xapian::termcount wdf,
            Xapian::termcount doclen, Xapian::termcount uniqterms) const =0

            The parameters give information about the document which may be used
            in the calculations:

            Parameters:
            -----------

            wdf:  The within document frequency of the term in the document.

            doclen:  The document's length (unnormalised).

            uniqterms:  Number of unique terms in the document (used for absolute
            smoothing).
            """
            return _xapian.Weight_get_sumpart(self, wdf, doclen, uniqterms)

        def get_maxpart(self):
            """

            Return an upper bound on what get_sumpart() can return for any
            document.

            virtual double Xapian::Weight::get_maxpart() const =0

            This information is used by the matcher to perform various
            optimisations, so strive to make the bound as tight as possible.
            """
            return _xapian.Weight_get_maxpart(self)

        def get_sumextra(self, doclen, uniqterms):
            """

            Calculate the term-independent weight component for a document.

            virtual double Xapian::Weight::get_sumextra(Xapian::termcount doclen,
            Xapian::termcount uniqterms) const =0

            The parameter gives information about the document which may be used
            in the calculations:

            Parameters:
            -----------

            doclen:  The document's length (unnormalised).

            uniqterms:  The number of unique terms in the document.
            """
            return _xapian.Weight_get_sumextra(self, doclen, uniqterms)

        def get_maxextra(self):
            """

            Return an upper bound on what get_sumextra() can return for any
            document.

            virtual double Xapian::Weight::get_maxextra() const =0

            This information is used by the matcher to perform various
            optimisations, so strive to make the bound as tight as possible.
            """
            return _xapian.Weight_get_maxextra(self)

    Weight.name = new_instancemethod(_xapian.Weight_name, None, Weight)
    Weight.get_sumpart = new_instancemethod(_xapian.Weight_get_sumpart, None, Weight)
    Weight.get_maxpart = new_instancemethod(_xapian.Weight_get_maxpart, None, Weight)
    Weight.get_sumextra = new_instancemethod(_xapian.Weight_get_sumextra, None, Weight)
    Weight.get_maxextra = new_instancemethod(_xapian.Weight_get_maxextra, None, Weight)
    Weight_swigregister = _xapian.Weight_swigregister
    Weight_swigregister(Weight)

    class BoolWeight(Weight):
        """

        Class implementing a "boolean" weighting scheme.

        This weighting scheme gives all documents zero weight.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Construct a BoolWeight.

            Xapian::BoolWeight::BoolWeight()
            """
            _xapian.BoolWeight_swiginit(self, _xapian.new_BoolWeight())
        __swig_destroy__ = _xapian.delete_BoolWeight
    BoolWeight_swigregister = _xapian.BoolWeight_swigregister
    BoolWeight_swigregister(BoolWeight)

    class TfIdfWeight(Weight):
        """

        Xapian::Weight subclass implementing the tf-idf weighting scheme.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct a TfIdfWeight using the default normalizations ("ntn").

            Xapian::TfIdfWeight::TfIdfWeight()
            """
            _xapian.TfIdfWeight_swiginit(self, _xapian.new_TfIdfWeight(*args))
        __swig_destroy__ = _xapian.delete_TfIdfWeight
    TfIdfWeight_swigregister = _xapian.TfIdfWeight_swigregister
    TfIdfWeight_swigregister(TfIdfWeight)

    class BM25Weight(Weight):
        """

        Xapian::Weight subclass implementing the BM25 probabilistic formula.

        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """Xapian::BM25Weight::BM25Weight() """
            _xapian.BM25Weight_swiginit(self, _xapian.new_BM25Weight(*args))
        __swig_destroy__ = _xapian.delete_BM25Weight
    BM25Weight_swigregister = _xapian.BM25Weight_swigregister
    BM25Weight_swigregister(BM25Weight)

    class BM25PlusWeight(Weight):
        """

        Xapian::Weight subclass implementing the BM25+ probabilistic formula.

        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """Xapian::BM25PlusWeight::BM25PlusWeight() """
            _xapian.BM25PlusWeight_swiginit(self, _xapian.new_BM25PlusWeight(*args))
        __swig_destroy__ = _xapian.delete_BM25PlusWeight
    BM25PlusWeight_swigregister = _xapian.BM25PlusWeight_swigregister
    BM25PlusWeight_swigregister(BM25PlusWeight)

    class TradWeight(Weight):
        """

        Xapian::Weight subclass implementing the traditional probabilistic
        formula.

        This class implements the "traditional" Probabilistic Weighting
        scheme, as described by the early papers on Probabilistic Retrieval.
        BM25 generally gives better results.

        TradWeight(k) is equivalent to BM25Weight(k, 0, 0, 1, 0), except that
        the latter returns weights (k+1) times larger.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, k=1.0):
            """

            Construct a TradWeight.

            Xapian::TradWeight::TradWeight(double k=1.0)

            Parameters:
            -----------

            k:  A non-negative parameter controlling how influential within-
            document- frequency (wdf) and document length are. k=0 means that wdf
            and document length don't affect the weights. The larger k is, the
            more they do. (default 1)
            """
            _xapian.TradWeight_swiginit(self, _xapian.new_TradWeight(k))
        __swig_destroy__ = _xapian.delete_TradWeight
    TradWeight_swigregister = _xapian.TradWeight_swigregister
    TradWeight_swigregister(TradWeight)

    class InL2Weight(Weight):
        """

        This class implements the InL2 weighting scheme.

        InL2 is a representative scheme of the Divergence from Randomness
        Framework by Gianni Amati.

        This weighting scheme is useful for tasks that require early
        precision.

        It uses the Inverse document frequency model (In), the Laplace method
        to find the aftereffect of sampling (L) and the second wdf
        normalization proposed by Amati to normalize the wdf in the document
        to the length of the document (H2).

        For more information about the DFR Framework and the InL2 scheme,
        please refer to: Gianni Amati and Cornelis Joost Van Rijsbergen
        Probabilistic models of information retrieval based on measuring the
        divergence from randomness ACM Transactions on Information Systems
        (TOIS) 20, (4), 2002, pp. 357-389.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """Xapian::InL2Weight::InL2Weight() """
            _xapian.InL2Weight_swiginit(self, _xapian.new_InL2Weight(*args))
        __swig_destroy__ = _xapian.delete_InL2Weight
    InL2Weight_swigregister = _xapian.InL2Weight_swigregister
    InL2Weight_swigregister(InL2Weight)

    class IfB2Weight(Weight):
        """

        This class implements the IfB2 weighting scheme.

        IfB2 is a representative scheme of the Divergence from Randomness
        Framework by Gianni Amati.

        It uses the Inverse term frequency model (If), the Bernoulli method to
        find the aftereffect of sampling (B) and the second wdf normalization
        proposed by Amati to normalize the wdf in the document to the length
        of the document (H2).

        For more information about the DFR Framework and the IfB2 scheme,
        please refer to: Gianni Amati and Cornelis Joost Van Rijsbergen
        Probabilistic models of information retrieval based on measuring the
        divergence from randomness ACM Transactions on Information Systems
        (TOIS) 20, (4), 2002, pp. 357-389.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """Xapian::IfB2Weight::IfB2Weight() """
            _xapian.IfB2Weight_swiginit(self, _xapian.new_IfB2Weight(*args))
        __swig_destroy__ = _xapian.delete_IfB2Weight
    IfB2Weight_swigregister = _xapian.IfB2Weight_swigregister
    IfB2Weight_swigregister(IfB2Weight)

    class IneB2Weight(Weight):
        """

        This class implements the IneB2 weighting scheme.

        IneB2 is a representative scheme of the Divergence from Randomness
        Framework by Gianni Amati.

        It uses the Inverse expected document frequency model (Ine), the
        Bernoulli method to find the aftereffect of sampling (B) and the
        second wdf normalization proposed by Amati to normalize the wdf in the
        document to the length of the document (H2).

        For more information about the DFR Framework and the IneB2 scheme,
        please refer to: Gianni Amati and Cornelis Joost Van Rijsbergen
        Probabilistic models of information retrieval based on measuring the
        divergence from randomness ACM Transactions on Information Systems
        (TOIS) 20, (4), 2002, pp. 357-389.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """Xapian::IneB2Weight::IneB2Weight() """
            _xapian.IneB2Weight_swiginit(self, _xapian.new_IneB2Weight(*args))
        __swig_destroy__ = _xapian.delete_IneB2Weight
    IneB2Weight_swigregister = _xapian.IneB2Weight_swigregister
    IneB2Weight_swigregister(IneB2Weight)

    class BB2Weight(Weight):
        """

        This class implements the BB2 weighting scheme.

        BB2 is a representative scheme of the Divergence from Randomness
        Framework by Gianni Amati.

        It uses the Bose-Einstein probabilistic distribution (B) along with
        Stirling's power approximation, the Bernoulli method to find the
        aftereffect of sampling (B) and the second wdf normalization proposed
        by Amati to normalize the wdf in the document to the length of the
        document (H2).

        For more information about the DFR Framework and the BB2 scheme,
        please refer to : Gianni Amati and Cornelis Joost Van Rijsbergen
        Probabilistic models of information retrieval based on measuring the
        divergence from randomness ACM Transactions on Information Systems
        (TOIS) 20, (4), 2002, pp. 357-389.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """Xapian::BB2Weight::BB2Weight() """
            _xapian.BB2Weight_swiginit(self, _xapian.new_BB2Weight(*args))
        __swig_destroy__ = _xapian.delete_BB2Weight
    BB2Weight_swigregister = _xapian.BB2Weight_swigregister
    BB2Weight_swigregister(BB2Weight)

    class DLHWeight(Weight):
        """

        This class implements the DLH weighting scheme, which is a
        representative scheme of the Divergence from Randomness Framework by
        Gianni Amati.

        This is a parameter free weighting scheme and it should be used with
        query expansion to obtain better results. It uses the HyperGeometric
        Probabilistic model and Laplace's normalization to calculate the risk
        gain.

        For more information about the DFR Framework and the DLH scheme,
        please refer to : a.) Gianni Amati and Cornelis Joost Van Rijsbergen
        Probabilistic models of information retrieval based on measuring the
        divergence from randomness ACM Transactions on Information Systems
        (TOIS) 20, (4), 2002, pp. 357-389. b.) FUB, IASI-CNR and University of
        Tor Vergata at TREC 2007 Blog Track. G. Amati and E. Ambrosi and M.
        Bianchi and C. Gaibisso and G. Gambosi. Proceedings of the 16th Text
        REtrieval Conference (TREC-2007), 2008.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """Xapian::DLHWeight::DLHWeight() """
            _xapian.DLHWeight_swiginit(self, _xapian.new_DLHWeight())
        __swig_destroy__ = _xapian.delete_DLHWeight
    DLHWeight_swigregister = _xapian.DLHWeight_swigregister
    DLHWeight_swigregister(DLHWeight)

    class PL2Weight(Weight):
        """

        This class implements the PL2 weighting scheme.

        PL2 is a representative scheme of the Divergence from Randomness
        Framework by Gianni Amati.

        This weighting scheme is useful for tasks that require early
        precision.

        It uses the Poisson approximation of the Binomial Probabilistic
        distribution (P) along with Stirling's approximation for the factorial
        value, the Laplace method to find the aftereffect of sampling (L) and
        the second wdf normalization proposed by Amati to normalize the wdf in
        the document to the length of the document (H2).

        For more information about the DFR Framework and the PL2 scheme,
        please refer to : Gianni Amati and Cornelis Joost Van Rijsbergen
        Probabilistic models of information retrieval based on measuring the
        divergence from randomness ACM Transactions on Information Systems
        (TOIS) 20, (4), 2002, pp. 357-389.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """Xapian::PL2Weight::PL2Weight() """
            _xapian.PL2Weight_swiginit(self, _xapian.new_PL2Weight(*args))
        __swig_destroy__ = _xapian.delete_PL2Weight
    PL2Weight_swigregister = _xapian.PL2Weight_swigregister
    PL2Weight_swigregister(PL2Weight)

    class PL2PlusWeight(Weight):
        """

        Xapian::Weight subclass implementing the PL2+ probabilistic formula.

        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """Xapian::PL2PlusWeight::PL2PlusWeight() """
            _xapian.PL2PlusWeight_swiginit(self, _xapian.new_PL2PlusWeight(*args))
        __swig_destroy__ = _xapian.delete_PL2PlusWeight
    PL2PlusWeight_swigregister = _xapian.PL2PlusWeight_swigregister
    PL2PlusWeight_swigregister(PL2PlusWeight)

    class DPHWeight(Weight):
        """

        This class implements the DPH weighting scheme.

        DPH is a representative scheme of the Divergence from Randomness
        Framework by Gianni Amati.

        This is a parameter free weighting scheme and it should be used with
        query expansion to obtain better results. It uses the HyperGeometric
        Probabilistic model and Popper's normalization to calculate the risk
        gain.

        For more information about the DFR Framework and the DPH scheme,
        please refer to : a.) Gianni Amati and Cornelis Joost Van Rijsbergen
        Probabilistic models of information retrieval based on measuring the
        divergence from randomness ACM Transactions on Information Systems
        (TOIS) 20, (4), 2002, pp. 357-389. b.) FUB, IASI-CNR and University of
        Tor Vergata at TREC 2007 Blog Track. G. Amati and E. Ambrosi and M.
        Bianchi and C. Gaibisso and G. Gambosi. Proceedings of the 16th Text
        Retrieval Conference (TREC-2007), 2008.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Construct a DPHWeight.

            Xapian::DPHWeight::DPHWeight()
            """
            _xapian.DPHWeight_swiginit(self, _xapian.new_DPHWeight())
        __swig_destroy__ = _xapian.delete_DPHWeight
    DPHWeight_swigregister = _xapian.DPHWeight_swigregister
    DPHWeight_swigregister(DPHWeight)

    class LMWeight(Weight):
        """

        Xapian::Weight subclass implementing the Language Model formula.

        This class implements the "Language Model" Weighting scheme, as
        described by the early papers on LM by Bruce Croft.

        LM works by comparing the query to a Language Model of the document.
        The language model itself is parameter-free, though LMWeight takes
        parameters which specify the smoothing used.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct a LMWeight.

            Xapian::LMWeight::LMWeight(double param_log_=0.0, type_smoothing
            select_smoothing_=TWO_STAGE_SMOOTHING, double param_smoothing1_=-1.0,
            double param_smoothing2_=-1.0)

            Parameters:
            -----------

            param_log_:  A non-negative parameter controlling how much to clamp
            negative values returned by the log. The log is calculated by
            multiplying the actual weight by param_log. If param_log is 0.0, then
            the document length upper bound will be used (default: document length
            upper bound)

            select_smoothing_:  A parameter of type enum type_smoothing. This
            parameter controls which smoothing type to use. (default:
            TWO_STAGE_SMOOTHING)

            param_smoothing1_:  A non-negative parameter for smoothing whose
            meaning depends on select_smoothing_. In JELINEK_MERCER_SMOOTHING, it
            plays the role of estimation and in DIRICHLET_SMOOTHING the role of
            query modelling. (default JELINEK_MERCER, ABSOLUTE, TWOSTAGE(0.7),
            DIRCHLET(2000))

            param_smoothing2_:  A non-negative parameter which is used with
            TWO_STAGE_SMOOTHING as parameter for Dirichlet's smoothing (default:
            2000) and as parameter delta to control the scale of the tf lower
            bound in the DIRICHLET_PLUS_SMOOTHING (default 0.05).
            """
            _xapian.LMWeight_swiginit(self, _xapian.new_LMWeight(*args))
        __swig_destroy__ = _xapian.delete_LMWeight
    LMWeight_swigregister = _xapian.LMWeight_swigregister
    LMWeight_swigregister(LMWeight)

    class CoordWeight(Weight):
        """

        Xapian::Weight subclass implementing Coordinate Matching.

        Each matching term score one point. See Managing Gigabytes, Second
        Edition p181.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def init(self, factor_):
            """

            Allow the subclass to perform any initialisation it needs to.

            void Xapian::CoordWeight::init(double factor_)

            Parameters:
            -----------

            factor:  Any scaling factor (e.g. from OP_SCALE_WEIGHT). If the Weight
            object is for the term-independent weight supplied by
            get_sumextra()/get_maxextra(), then init(0.0) is called (starting from
            Xapian 1.2.11 and 1.3.1 - earlier versions failed to call init() for
            such Weight objects).
            """
            return _xapian.CoordWeight_init(self, factor_)

        def __init__(self):
            """

            Construct a CoordWeight.

            Xapian::CoordWeight::CoordWeight()
            """
            _xapian.CoordWeight_swiginit(self, _xapian.new_CoordWeight())
        __swig_destroy__ = _xapian.delete_CoordWeight
    CoordWeight.init = new_instancemethod(_xapian.CoordWeight_init, None, CoordWeight)
    CoordWeight_swigregister = _xapian.CoordWeight_swigregister
    CoordWeight_swigregister(CoordWeight)

    class Compactor(object):
        """

        Compact a database, or merge and compact several.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr
        STANDARD = _xapian.Compactor_STANDARD
        FULL = _xapian.Compactor_FULL
        FULLER = _xapian.Compactor_FULLER

        def __init__(self):
            """Xapian::Compactor::Compactor() """
            if self.__class__ == Compactor:
                _self = None
            else:
                _self = self
            _xapian.Compactor_swiginit(self, _xapian.new_Compactor(_self, ))
        __swig_destroy__ = _xapian.delete_Compactor

        def set_block_size(self, block_size):
            """

            Set the block size to use for tables in the output database.

            void Xapian::Compactor::set_block_size(size_t block_size)

            Parameters:
            -----------

            block_size:  The block size to use. Valid block sizes are currently
            powers of two between 2048 and 65536, with the default being 8192, but
            the valid sizes and default may change in the future.
            """
            return _xapian.Compactor_set_block_size(self, block_size)

        def set_renumber(self, renumber):
            """

            Set whether to preserve existing document id values.

            void Xapian::Compactor::set_renumber(bool renumber)

            Parameters:
            -----------

            renumber:  The default is true, which means that document ids will be
            renumbered - currently by applying the same offset to all the document
            ids in a particular source database.

            If false, then the document ids must be unique over all source
            databases. Currently the ranges of document ids in each source must
            not overlap either, though this restriction may be removed in the
            future.
            """
            return _xapian.Compactor_set_renumber(self, renumber)

        def set_multipass(self, multipass):
            """

            Set whether to merge postlists in multiple passes.

            void Xapian::Compactor::set_multipass(bool multipass)

            Parameters:
            -----------

            multipass:  If true and merging more than 3 databases, merge the
            postlists in multiple passes, which is generally faster but requires
            more disk space for temporary files. By default we don't do this.
            """
            return _xapian.Compactor_set_multipass(self, multipass)

        def set_compaction_level(self, compaction):
            """

            Set the compaction level.

            void Xapian::Compactor::set_compaction_level(compaction_level
            compaction)

            Parameters:
            -----------

            compaction:  Available values are:  Xapian::Compactor::STANDARD -
            Don't split items unnecessarily.

            Xapian::Compactor::FULL - Split items whenever it saves space (the
            default).

            Xapian::Compactor::FULLER - Allow oversize items to save more space
            (not recommended if you ever plan to update the compacted database).

            """
            return _xapian.Compactor_set_compaction_level(self, compaction)

        def set_destdir(self, destdir):
            """

            Set where to write the output.

            void Xapian::Compactor::set_destdir(const std::string &destdir)

            Deprecated Use Database::compact(destdir[, compactor]) instead.

            Parameters:
            -----------

            destdir:  Output path. This can be the same as an input if that input
            is a stub database (in which case the database(s) listed in the stub
            will be compacted to a new database and then the stub will be
            atomically updated to point to this new database).
            """
            return _xapian.Compactor_set_destdir(self, destdir)

        def add_source(self, srcdir):
            """

            Add a source database.

            void Xapian::Compactor::add_source(const std::string &srcdir)

            Deprecated Use Database::compact(destdir[, compactor]) instead.

            Parameters:
            -----------

            srcdir:  The path to the source database to add.
            """
            return _xapian.Compactor_add_source(self, srcdir)

        def compact(self):
            """

            Perform the actual compaction/merging operation.

            void Xapian::Compactor::compact()

            Deprecated Use Database::compact(destdir[, compactor]) instead.
            """
            return _xapian.Compactor_compact(self)

        def set_status(self, table, status):
            """

            Update progress.

            virtual void Xapian::Compactor::set_status(const std::string &table,
            const std::string &status)

            Subclass this method if you want to get progress updates during
            compaction. This is called for each table first with empty status, And
            then one or more times with non-empty status.

            The default implementation does nothing.

            Parameters:
            -----------

            table:  The table currently being compacted.

            status:  A status message.
            """
            return _xapian.Compactor_set_status(self, table, status)

        def resolve_duplicate_metadata(self, key, num_tags, tags):
            """

            Resolve multiple user metadata entries with the same key.

            virtual std::string
            Xapian::Compactor::resolve_duplicate_metadata(const std::string &key,
            size_t num_tags, const std::string tags[])

            When merging, if the same user metadata key is set in more than one
            input, then this method is called to allow this to be resolving in an
            appropriate way.

            The default implementation just returns tags[0].

            For multipass this will currently get called multiple times for the
            same key if there are duplicates to resolve in each pass, but this may
            change in the future.

            Since 1.4.6, an implementation of this method can return an empty
            string to indicate that the appropriate result is to not set a value
            for this user metadata key in the output database. In older versions,
            you should not return an empty string.

            Parameters:
            -----------

            key:  The metadata key with duplicate entries.

            num_tags:  How many tags there are.

            tags:  An array of num_tags strings containing the tags to merge.
            """
            return _xapian.Compactor_resolve_duplicate_metadata(self, key, num_tags, tags)

        def __disown__(self):
            self.this.disown()
            _xapian.disown_Compactor(self)
            return weakref_proxy(self)
    Compactor.set_block_size = new_instancemethod(_xapian.Compactor_set_block_size, None, Compactor)
    Compactor.set_renumber = new_instancemethod(_xapian.Compactor_set_renumber, None, Compactor)
    Compactor.set_multipass = new_instancemethod(_xapian.Compactor_set_multipass, None, Compactor)
    Compactor.set_compaction_level = new_instancemethod(_xapian.Compactor_set_compaction_level, None, Compactor)
    Compactor.set_destdir = new_instancemethod(_xapian.Compactor_set_destdir, None, Compactor)
    Compactor.add_source = new_instancemethod(_xapian.Compactor_add_source, None, Compactor)
    Compactor.compact = new_instancemethod(_xapian.Compactor_compact, None, Compactor)
    Compactor.set_status = new_instancemethod(_xapian.Compactor_set_status, None, Compactor)
    Compactor.resolve_duplicate_metadata = new_instancemethod(_xapian.Compactor_resolve_duplicate_metadata, None, Compactor)
    Compactor_swigregister = _xapian.Compactor_swigregister
    Compactor_swigregister(Compactor)

    class PostingSource(object):
        """

        Base class which provides an "external" source of postings.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Allow subclasses to be instantiated.

            Xapian::PostingSource::PostingSource()
            """
            if self.__class__ == PostingSource:
                _self = None
            else:
                _self = self
            _xapian.PostingSource_swiginit(self, _xapian.new_PostingSource(_self, ))
        __swig_destroy__ = _xapian.delete_PostingSource

        def get_termfreq_min(self):
            """

            A lower bound on the number of documents this object can return.

            virtual Xapian::doccount Xapian::PostingSource::get_termfreq_min()
            const =0

            Xapian will always call init() on a PostingSource before calling this
            for the first time.
            """
            return _xapian.PostingSource_get_termfreq_min(self)

        def get_termfreq_est(self):
            """

            An estimate of the number of documents this object can return.

            virtual Xapian::doccount Xapian::PostingSource::get_termfreq_est()
            const =0

            It must always be true that:

            get_termfreq_min() <= get_termfreq_est() <= get_termfreq_max()

            Xapian will always call init() on a PostingSource before calling this
            for the first time.
            """
            return _xapian.PostingSource_get_termfreq_est(self)

        def get_termfreq_max(self):
            """

            An upper bound on the number of documents this object can return.

            virtual Xapian::doccount Xapian::PostingSource::get_termfreq_max()
            const =0

            Xapian will always call init() on a PostingSource before calling this
            for the first time.
            """
            return _xapian.PostingSource_get_termfreq_max(self)

        def set_maxweight(self, max_weight):
            """

            Specify an upper bound on what get_weight() will return from now on.

            void Xapian::PostingSource::set_maxweight(double max_weight)

            This upper bound is used by the matcher to perform various
            optimisations, so if you can return a good bound, then matches will
            generally run faster.

            This method should be called after calling init(), and may be called
            during iteration if the upper bound drops. It is probably only useful
            to call from subclasses (it was actually a "protected" method prior
            to Xapian 1.3.4, but that makes it tricky to wrap for other
            languages).

            It is valid for the posting source to have returned a higher value
            from get_weight() earlier in the iteration, but the posting source
            must not return a higher value from get_weight() than the currently
            set upper bound, and the upper bound must not be increased (until
            init() has been called).

            If you don't call this method, the upper bound will default to 0, for
            convenience when implementing "weight-less" PostingSource
            subclasses.

            Parameters:
            -----------

            max_weight:  The upper bound to set.
            """
            return _xapian.PostingSource_set_maxweight(self, max_weight)

        def get_maxweight(self):
            """

            Return the currently set upper bound on what get_weight() can return.

            double Xapian::PostingSource::get_maxweight() const
            """
            return _xapian.PostingSource_get_maxweight(self)

        def get_weight(self):
            """

            Return the weight contribution for the current document.

            virtual double Xapian::PostingSource::get_weight() const

            This default implementation always returns 0, for convenience when
            implementing "weight-less" PostingSource subclasses.

            This method may assume that it will only be called when there is a
            "current document". In detail: Xapian will always call init() on a
            PostingSource before calling this for the first time. It will also
            only call this if the PostingSource reports that it is pointing to a
            valid document (ie, it will not call it before calling at least one of
            next(), skip_to() or check(), and will ensure that the PostingSource
            is not at the end by calling at_end()).
            """
            return _xapian.PostingSource_get_weight(self)

        def get_docid(self):
            """

            Return the current docid.

            virtual Xapian::docid Xapian::PostingSource::get_docid() const =0

            This method may assume that it will only be called when there is a
            "current document". See  get_weight() for details.

            Note: in the case of a multi-database search, the returned docid
            should be in the single subdatabase relevant to this posting source.
            See the  init() method for details.
            """
            return _xapian.PostingSource_get_docid(self)

        def next(self, min_wt):
            """

            Advance the current position to the next matching document.

            virtual void Xapian::PostingSource::next(double min_wt)=0

            The PostingSource starts before the first entry in the list, so
            next(), skip_to() or check() must be called before any methods which
            need the context of the current position.

            Xapian will always call init() on a PostingSource before calling this
            for the first time.

            Parameters:
            -----------

            min_wt:  The minimum weight contribution that is needed (this is just
            a hint which subclasses may ignore).
            """
            return _xapian.PostingSource_next(self, min_wt)

        def skip_to(self, did, min_wt):
            """

            Advance to the specified docid.

            virtual void Xapian::PostingSource::skip_to(Xapian::docid did, double
            min_wt)

            If the specified docid isn't in the list, position ourselves on the
            first document after it (or at_end() if no greater docids are
            present).

            If the current position is already the specified docid, this method
            will leave the position unmodified.

            If the specified docid is earlier than the current position, the
            behaviour is unspecified. A sensible behaviour would be to leave the
            current position unmodified, but it is also reasonable to move to the
            specified docid.

            The default implementation calls next() repeatedly, which works but
            skip_to() can often be implemented much more efficiently.

            Xapian will always call init() on a PostingSource before calling this
            for the first time.

            Note: in the case of a multi-database search, the docid specified is
            the docid in the single subdatabase relevant to this posting source.
            See the  init() method for details.

            Parameters:
            -----------

            did:  The document id to advance to.

            min_wt:  The minimum weight contribution that is needed (this is just
            a hint which subclasses may ignore).
            """
            return _xapian.PostingSource_skip_to(self, did, min_wt)

        def check(self, did, min_wt):
            """

            Check if the specified docid occurs.

            virtual bool Xapian::PostingSource::check(Xapian::docid did, double
            min_wt)

            The caller is required to ensure that the specified document id did
            actually exists in the database. If it does, it must move to that
            document id, and return true. If it does not, it may either:

            return true, having moved to a definite position (including
            "at_end"), which must be the same position as skip_to() would have
            moved to.

            or

            return false, having moved to an "indeterminate" position, such that
            a subsequent call to next() or skip_to() will move to the next
            matching position after did.

            Generally, this method should act like skip_to() and return true if
            that can be done at little extra cost.

            Otherwise it should simply check if a particular docid is present,
            returning true if it is, and false if it isn't.

            The default implementation calls skip_to() and always returns true.

            Xapian will always call init() on a PostingSource before calling this
            for the first time.

            Note: in the case of a multi-database search, the docid specified is
            the docid in the single subdatabase relevant to this posting source.
            See the  init() method for details.

            Parameters:
            -----------

            did:  The document id to check.

            min_wt:  The minimum weight contribution that is needed (this is just
            a hint which subclasses may ignore).
            """
            return _xapian.PostingSource_check(self, did, min_wt)

        def at_end(self):
            """

            Return true if the current position is past the last entry in this
            list.

            virtual bool Xapian::PostingSource::at_end() const =0

            At least one of  next(),  skip_to() or  check() will be called before
            this method is first called.
            """
            return _xapian.PostingSource_at_end(self)

        def name(self):
            """

            Name of the posting source class.

            virtual std::string Xapian::PostingSource::name() const

            This is used when serialising and unserialising posting sources; for
            example, for performing remote searches.

            If the subclass is in a C++ namespace, the namespace should be
            included in the name, using "::" as a separator. For example, for a
            PostingSource subclass called "FooPostingSource" in the "Xapian"
            namespace the result of this call should be
            "Xapian::FooPostingSource".

            This should only be implemented if serialise() and unserialise() are
            also implemented. The default implementation returns an empty string.

            If this returns an empty string, Xapian will assume that serialise()
            and unserialise() are not implemented.
            """
            return _xapian.PostingSource_name(self)

        def init(self, db):
            """

            Set this PostingSource to the start of the list of postings.

            virtual void Xapian::PostingSource::init(const Database &db)=0

            This is called automatically by the matcher prior to each query being
            processed.

            If a PostingSource is used for multiple searches,  init() will
            therefore be called multiple times, and must handle this by using the
            database passed in the most recent call.

            Parameters:
            -----------

            db:  The database which the PostingSource should iterate through.

            Note: in the case of a multi-database search, a separate PostingSource
            will be used for each database (the separate PostingSources will be
            obtained using  clone()), and each PostingSource will be passed one of
            the sub-databases as the db parameter here. The db parameter will
            therefore always refer to a single database. All docids passed to, or
            returned from, the PostingSource refer to docids in that single
            database, rather than in the multi- database.
            """
            return _xapian.PostingSource_init(self, db)

        def __str__(self):
            """

            Return a string describing this object.

            virtual std::string Xapian::PostingSource::get_description() const

            This default implementation returns a generic answer. This default it
            provided to avoid forcing those deriving their own PostingSource
            subclass from having to implement this (they may not care what
            get_description() gives for their subclass).
            """
            return _xapian.PostingSource___str__(self)

        def release(self):
            """

            Start reference counting this object.

            const PostingSource* Xapian::PostingSource::release() const

            You can hand ownership of a dynamically allocated PostingSource object
            to Xapian by calling release() and then passing the object to a Xapian
            method. Xapian will arrange to delete the object once it is no longer
            required.
            """
            return _xapian.PostingSource_release(self)

        def __disown__(self):
            self.this.disown()
            _xapian.disown_PostingSource(self)
            return weakref_proxy(self)
    PostingSource.get_termfreq_min = new_instancemethod(_xapian.PostingSource_get_termfreq_min, None, PostingSource)
    PostingSource.get_termfreq_est = new_instancemethod(_xapian.PostingSource_get_termfreq_est, None, PostingSource)
    PostingSource.get_termfreq_max = new_instancemethod(_xapian.PostingSource_get_termfreq_max, None, PostingSource)
    PostingSource.set_maxweight = new_instancemethod(_xapian.PostingSource_set_maxweight, None, PostingSource)
    PostingSource.get_maxweight = new_instancemethod(_xapian.PostingSource_get_maxweight, None, PostingSource)
    PostingSource.get_weight = new_instancemethod(_xapian.PostingSource_get_weight, None, PostingSource)
    PostingSource.get_docid = new_instancemethod(_xapian.PostingSource_get_docid, None, PostingSource)
    PostingSource.next = new_instancemethod(_xapian.PostingSource_next, None, PostingSource)
    PostingSource.skip_to = new_instancemethod(_xapian.PostingSource_skip_to, None, PostingSource)
    PostingSource.check = new_instancemethod(_xapian.PostingSource_check, None, PostingSource)
    PostingSource.at_end = new_instancemethod(_xapian.PostingSource_at_end, None, PostingSource)
    PostingSource.name = new_instancemethod(_xapian.PostingSource_name, None, PostingSource)
    PostingSource.init = new_instancemethod(_xapian.PostingSource_init, None, PostingSource)
    PostingSource.__str__ = new_instancemethod(_xapian.PostingSource___str__, None, PostingSource)
    PostingSource.release = new_instancemethod(_xapian.PostingSource_release, None, PostingSource)
    PostingSource_swigregister = _xapian.PostingSource_swigregister
    PostingSource_swigregister(PostingSource)

    class ValuePostingSource(PostingSource):
        """

        A posting source which generates weights from a value slot.

        This is a base class for classes which generate weights using values
        stored in the specified slot. For example, ValueWeightPostingSource
        uses sortable_unserialise to convert values directly to weights.

        The upper bound on the weight returned is set to DBL_MAX. Subclasses
        should call set_maxweight() in their init() methods after calling
        ValuePostingSource::init() if they know a tighter bound on the weight.

        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, slot_):
            """

            Construct a ValuePostingSource.

            Xapian::ValuePostingSource::ValuePostingSource(Xapian::valueno slot_)

            Parameters:
            -----------

            slot_:  The value slot to read values from.
            """
            if self.__class__ == ValuePostingSource:
                _self = None
            else:
                _self = self
            _xapian.ValuePostingSource_swiginit(self, _xapian.new_ValuePostingSource(_self, slot_))

        def get_termfreq_min(self):
            """

            A lower bound on the number of documents this object can return.

            Xapian::doccount Xapian::ValuePostingSource::get_termfreq_min() const

            Xapian will always call init() on a PostingSource before calling this
            for the first time.
            """
            return _xapian.ValuePostingSource_get_termfreq_min(self)

        def get_termfreq_est(self):
            """

            An estimate of the number of documents this object can return.

            Xapian::doccount Xapian::ValuePostingSource::get_termfreq_est() const

            It must always be true that:

            get_termfreq_min() <= get_termfreq_est() <= get_termfreq_max()

            Xapian will always call init() on a PostingSource before calling this
            for the first time.
            """
            return _xapian.ValuePostingSource_get_termfreq_est(self)

        def get_termfreq_max(self):
            """

            An upper bound on the number of documents this object can return.

            Xapian::doccount Xapian::ValuePostingSource::get_termfreq_max() const

            Xapian will always call init() on a PostingSource before calling this
            for the first time.
            """
            return _xapian.ValuePostingSource_get_termfreq_max(self)

        def next(self, min_wt):
            """

            Advance the current position to the next matching document.

            void Xapian::ValuePostingSource::next(double min_wt)

            The PostingSource starts before the first entry in the list, so
            next(), skip_to() or check() must be called before any methods which
            need the context of the current position.

            Xapian will always call init() on a PostingSource before calling this
            for the first time.

            Parameters:
            -----------

            min_wt:  The minimum weight contribution that is needed (this is just
            a hint which subclasses may ignore).
            """
            return _xapian.ValuePostingSource_next(self, min_wt)

        def skip_to(self, min_docid, min_wt):
            """

            Advance to the specified docid.

            void Xapian::ValuePostingSource::skip_to(Xapian::docid min_docid,
            double min_wt)

            If the specified docid isn't in the list, position ourselves on the
            first document after it (or at_end() if no greater docids are
            present).

            If the current position is already the specified docid, this method
            will leave the position unmodified.

            If the specified docid is earlier than the current position, the
            behaviour is unspecified. A sensible behaviour would be to leave the
            current position unmodified, but it is also reasonable to move to the
            specified docid.

            The default implementation calls next() repeatedly, which works but
            skip_to() can often be implemented much more efficiently.

            Xapian will always call init() on a PostingSource before calling this
            for the first time.

            Note: in the case of a multi-database search, the docid specified is
            the docid in the single subdatabase relevant to this posting source.
            See the  init() method for details.

            Parameters:
            -----------

            did:  The document id to advance to.

            min_wt:  The minimum weight contribution that is needed (this is just
            a hint which subclasses may ignore).
            """
            return _xapian.ValuePostingSource_skip_to(self, min_docid, min_wt)

        def check(self, min_docid, min_wt):
            """

            Check if the specified docid occurs.

            bool Xapian::ValuePostingSource::check(Xapian::docid min_docid, double
            min_wt)

            The caller is required to ensure that the specified document id did
            actually exists in the database. If it does, it must move to that
            document id, and return true. If it does not, it may either:

            return true, having moved to a definite position (including
            "at_end"), which must be the same position as skip_to() would have
            moved to.

            or

            return false, having moved to an "indeterminate" position, such that
            a subsequent call to next() or skip_to() will move to the next
            matching position after did.

            Generally, this method should act like skip_to() and return true if
            that can be done at little extra cost.

            Otherwise it should simply check if a particular docid is present,
            returning true if it is, and false if it isn't.

            The default implementation calls skip_to() and always returns true.

            Xapian will always call init() on a PostingSource before calling this
            for the first time.

            Note: in the case of a multi-database search, the docid specified is
            the docid in the single subdatabase relevant to this posting source.
            See the  init() method for details.

            Parameters:
            -----------

            did:  The document id to check.

            min_wt:  The minimum weight contribution that is needed (this is just
            a hint which subclasses may ignore).
            """
            return _xapian.ValuePostingSource_check(self, min_docid, min_wt)

        def at_end(self):
            """

            Return true if the current position is past the last entry in this
            list.

            bool Xapian::ValuePostingSource::at_end() const

            At least one of  next(),  skip_to() or  check() will be called before
            this method is first called.
            """
            return _xapian.ValuePostingSource_at_end(self)

        def get_docid(self):
            """

            Return the current docid.

            Xapian::docid Xapian::ValuePostingSource::get_docid() const

            This method may assume that it will only be called when there is a
            "current document". See  get_weight() for details.

            Note: in the case of a multi-database search, the returned docid
            should be in the single subdatabase relevant to this posting source.
            See the  init() method for details.
            """
            return _xapian.ValuePostingSource_get_docid(self)

        def init(self, db_):
            """

            Set this PostingSource to the start of the list of postings.

            void Xapian::ValuePostingSource::init(const Database &db_)

            This is called automatically by the matcher prior to each query being
            processed.

            If a PostingSource is used for multiple searches,  init() will
            therefore be called multiple times, and must handle this by using the
            database passed in the most recent call.

            Parameters:
            -----------

            db:  The database which the PostingSource should iterate through.

            Note: in the case of a multi-database search, a separate PostingSource
            will be used for each database (the separate PostingSources will be
            obtained using  clone()), and each PostingSource will be passed one of
            the sub-databases as the db parameter here. The db parameter will
            therefore always refer to a single database. All docids passed to, or
            returned from, the PostingSource refer to docids in that single
            database, rather than in the multi- database.
            """
            return _xapian.ValuePostingSource_init(self, db_)

        def get_database(self):
            """

            The database we're reading values from.

            Xapian::Database Xapian::ValuePostingSource::get_database() const

            Added in 1.2.23 and 1.3.5.
            """
            return _xapian.ValuePostingSource_get_database(self)

        def get_slot(self):
            """

            The slot we're reading values from.

            Xapian::valueno Xapian::ValuePostingSource::get_slot() const

            Added in 1.2.23 and 1.3.5.
            """
            return _xapian.ValuePostingSource_get_slot(self)

        def get_value(self):
            """

            Read current value.

            std::string Xapian::ValuePostingSource::get_value() const

            Added in 1.2.23 and 1.3.5.
            """
            return _xapian.ValuePostingSource_get_value(self)

        def done(self):
            """

            End the iteration.

            void Xapian::ValuePostingSource::done()

            Calls to at_end() will return true after calling this method.

            Added in 1.2.23 and 1.3.5.
            """
            return _xapian.ValuePostingSource_done(self)

        def get_started(self):
            """

            Flag indicating if we've started (true if we have).

            bool Xapian::ValuePostingSource::get_started() const

            Added in 1.2.23 and 1.3.5.
            """
            return _xapian.ValuePostingSource_get_started(self)

        def set_termfreq_min(self, termfreq_min_):
            """

            Set a lower bound on the term frequency.

            void Xapian::ValuePostingSource::set_termfreq_min(Xapian::doccount
            termfreq_min_)

            Subclasses should set this if they are overriding the next(),
            skip_to() or check() methods to return fewer documents.

            Added in 1.2.23 and 1.3.5.
            """
            return _xapian.ValuePostingSource_set_termfreq_min(self, termfreq_min_)

        def set_termfreq_est(self, termfreq_est_):
            """

            An estimate of the term frequency.

            void Xapian::ValuePostingSource::set_termfreq_est(Xapian::doccount
            termfreq_est_)

            Subclasses should set this if they are overriding the next(),
            skip_to() or check() methods.

            Added in 1.2.23 and 1.3.5.
            """
            return _xapian.ValuePostingSource_set_termfreq_est(self, termfreq_est_)

        def set_termfreq_max(self, termfreq_max_):
            """

            An upper bound on the term frequency.

            void Xapian::ValuePostingSource::set_termfreq_max(Xapian::doccount
            termfreq_max_)

            Subclasses should set this if they are overriding the next(),
            skip_to() or check() methods.

            Added in 1.2.23 and 1.3.5.
            """
            return _xapian.ValuePostingSource_set_termfreq_max(self, termfreq_max_)

        __swig_destroy__ = _xapian.delete_ValuePostingSource
        def __disown__(self):
            self.this.disown()
            _xapian.disown_ValuePostingSource(self)
            return weakref_proxy(self)
    ValuePostingSource.get_termfreq_min = new_instancemethod(_xapian.ValuePostingSource_get_termfreq_min, None, ValuePostingSource)
    ValuePostingSource.get_termfreq_est = new_instancemethod(_xapian.ValuePostingSource_get_termfreq_est, None, ValuePostingSource)
    ValuePostingSource.get_termfreq_max = new_instancemethod(_xapian.ValuePostingSource_get_termfreq_max, None, ValuePostingSource)
    ValuePostingSource.next = new_instancemethod(_xapian.ValuePostingSource_next, None, ValuePostingSource)
    ValuePostingSource.skip_to = new_instancemethod(_xapian.ValuePostingSource_skip_to, None, ValuePostingSource)
    ValuePostingSource.check = new_instancemethod(_xapian.ValuePostingSource_check, None, ValuePostingSource)
    ValuePostingSource.at_end = new_instancemethod(_xapian.ValuePostingSource_at_end, None, ValuePostingSource)
    ValuePostingSource.get_docid = new_instancemethod(_xapian.ValuePostingSource_get_docid, None, ValuePostingSource)
    ValuePostingSource.init = new_instancemethod(_xapian.ValuePostingSource_init, None, ValuePostingSource)
    ValuePostingSource.get_database = new_instancemethod(_xapian.ValuePostingSource_get_database, None, ValuePostingSource)
    ValuePostingSource.get_slot = new_instancemethod(_xapian.ValuePostingSource_get_slot, None, ValuePostingSource)
    ValuePostingSource.get_value = new_instancemethod(_xapian.ValuePostingSource_get_value, None, ValuePostingSource)
    ValuePostingSource.done = new_instancemethod(_xapian.ValuePostingSource_done, None, ValuePostingSource)
    ValuePostingSource.get_started = new_instancemethod(_xapian.ValuePostingSource_get_started, None, ValuePostingSource)
    ValuePostingSource.set_termfreq_min = new_instancemethod(_xapian.ValuePostingSource_set_termfreq_min, None, ValuePostingSource)
    ValuePostingSource.set_termfreq_est = new_instancemethod(_xapian.ValuePostingSource_set_termfreq_est, None, ValuePostingSource)
    ValuePostingSource.set_termfreq_max = new_instancemethod(_xapian.ValuePostingSource_set_termfreq_max, None, ValuePostingSource)
    ValuePostingSource_swigregister = _xapian.ValuePostingSource_swigregister
    ValuePostingSource_swigregister(ValuePostingSource)

    class ValueWeightPostingSource(ValuePostingSource):
        """

        A posting source which reads weights from a value slot.

        This returns entries for all documents in the given database which
        have a non empty values in the specified slot. It returns a weight
        calculated by applying sortable_unserialise to the value stored in the
        slot (so the values stored should probably have been calculated by
        applying sortable_serialise to a floating point number at index time).

        The upper bound on the weight returned is set using the upper bound on
        the values in the specified slot, or DBL_MAX if value bounds aren't
        supported by the current backend.

        For efficiency, this posting source doesn't check that the stored
        values are valid in any way, so it will never raise an exception due
        to invalid stored values. In particular, it doesn't ensure that the
        unserialised values are positive, which is a requirement for weights.
        The behaviour if the slot contains values which unserialise to
        negative values is undefined.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, slot_):
            """

            Construct a ValueWeightPostingSource.

            Xapian::ValueWeightPostingSource::ValueWeightPostingSource(Xapian::valueno
            slot_)

            Parameters:
            -----------

            slot_:  The value slot to read values from.
            """
            if self.__class__ == ValueWeightPostingSource:
                _self = None
            else:
                _self = self
            _xapian.ValueWeightPostingSource_swiginit(self, _xapian.new_ValueWeightPostingSource(_self, slot_))

        def get_weight(self):
            """

            Return the weight contribution for the current document.

            double Xapian::ValueWeightPostingSource::get_weight() const

            This default implementation always returns 0, for convenience when
            implementing "weight-less" PostingSource subclasses.

            This method may assume that it will only be called when there is a
            "current document". In detail: Xapian will always call init() on a
            PostingSource before calling this for the first time. It will also
            only call this if the PostingSource reports that it is pointing to a
            valid document (ie, it will not call it before calling at least one of
            next(), skip_to() or check(), and will ensure that the PostingSource
            is not at the end by calling at_end()).
            """
            return _xapian.ValueWeightPostingSource_get_weight(self)

        def name(self):
            """

            Name of the posting source class.

            std::string Xapian::ValueWeightPostingSource::name() const

            This is used when serialising and unserialising posting sources; for
            example, for performing remote searches.

            If the subclass is in a C++ namespace, the namespace should be
            included in the name, using "::" as a separator. For example, for a
            PostingSource subclass called "FooPostingSource" in the "Xapian"
            namespace the result of this call should be
            "Xapian::FooPostingSource".

            This should only be implemented if serialise() and unserialise() are
            also implemented. The default implementation returns an empty string.

            If this returns an empty string, Xapian will assume that serialise()
            and unserialise() are not implemented.
            """
            return _xapian.ValueWeightPostingSource_name(self)

        def init(self, db_):
            """

            Set this PostingSource to the start of the list of postings.

            void Xapian::ValueWeightPostingSource::init(const Database &db_)

            This is called automatically by the matcher prior to each query being
            processed.

            If a PostingSource is used for multiple searches,  init() will
            therefore be called multiple times, and must handle this by using the
            database passed in the most recent call.

            Parameters:
            -----------

            db:  The database which the PostingSource should iterate through.

            Note: in the case of a multi-database search, a separate PostingSource
            will be used for each database (the separate PostingSources will be
            obtained using  clone()), and each PostingSource will be passed one of
            the sub-databases as the db parameter here. The db parameter will
            therefore always refer to a single database. All docids passed to, or
            returned from, the PostingSource refer to docids in that single
            database, rather than in the multi- database.
            """
            return _xapian.ValueWeightPostingSource_init(self, db_)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::ValueWeightPostingSource::get_description() const

            This default implementation returns a generic answer. This default it
            provided to avoid forcing those deriving their own PostingSource
            subclass from having to implement this (they may not care what
            get_description() gives for their subclass).
            """
            return _xapian.ValueWeightPostingSource___str__(self)

        __swig_destroy__ = _xapian.delete_ValueWeightPostingSource
        def __disown__(self):
            self.this.disown()
            _xapian.disown_ValueWeightPostingSource(self)
            return weakref_proxy(self)
    ValueWeightPostingSource.get_weight = new_instancemethod(_xapian.ValueWeightPostingSource_get_weight, None, ValueWeightPostingSource)
    ValueWeightPostingSource.name = new_instancemethod(_xapian.ValueWeightPostingSource_name, None, ValueWeightPostingSource)
    ValueWeightPostingSource.init = new_instancemethod(_xapian.ValueWeightPostingSource_init, None, ValueWeightPostingSource)
    ValueWeightPostingSource.__str__ = new_instancemethod(_xapian.ValueWeightPostingSource___str__, None, ValueWeightPostingSource)
    ValueWeightPostingSource_swigregister = _xapian.ValueWeightPostingSource_swigregister
    ValueWeightPostingSource_swigregister(ValueWeightPostingSource)

    class DecreasingValueWeightPostingSource(ValueWeightPostingSource):
        """

        Read weights from a value which is known to decrease as docid
        increases.

        This posting source can be used, like ValueWeightPostingSource, to add
        a weight contribution to a query based on the values stored in a slot.
        The values in the slot must be serialised as by  sortable_serialise().

        However, this posting source is additionally given a range of document
        IDs, within which the weight is known to be decreasing. ie, for all
        documents with ids A and B within this range (including the
        endpoints), where A is less than B, the weight of A is less than or
        equal to the weight of B. This can allow the posting source to skip to
        the end of the range quickly if insufficient weight is left in the
        posting source for a particular source.

        By default, the range is assumed to cover all document IDs.

        The ordering property can be arranged at index time, or by sorting an
        indexed database to produce a new, sorted, database.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, slot_, range_start_=0, range_end_=0):
            """

            Construct a DecreasingValueWeightPostingSource.

            Xapian::DecreasingValueWeightPostingSource::DecreasingValueWeightPostingSource(Xapian::valueno
            slot_, Xapian::docid range_start_=0, Xapian::docid range_end_=0)

            Parameters:
            -----------

            slot_:  The value slot to read values from.

            range_start_:  Start of range of docids for which weights are known to
            be decreasing (default: first docid)

            range_end_:  End of range of docids for which weights are known to be
            decreasing (default: last docid)
            """
            _xapian.DecreasingValueWeightPostingSource_swiginit(self, _xapian.new_DecreasingValueWeightPostingSource(slot_, range_start_, range_end_))
        __swig_destroy__ = _xapian.delete_DecreasingValueWeightPostingSource
    DecreasingValueWeightPostingSource_swigregister = _xapian.DecreasingValueWeightPostingSource_swigregister
    DecreasingValueWeightPostingSource_swigregister(DecreasingValueWeightPostingSource)

    class ValueMapPostingSource(ValuePostingSource):
        """

        A posting source which looks up weights in a map using values as the
        key.

        This allows will return entries for all documents in the given
        database which have a value in the slot specified. The values will be
        mapped to the corresponding weight in the weight map. If there is no
        mapping for a particular value, the default weight will be returned
        (which itself defaults to 0.0).
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, slot_):
            """

            Construct a ValueMapPostingSource.

            Xapian::ValueMapPostingSource::ValueMapPostingSource(Xapian::valueno
            slot_)

            Parameters:
            -----------

            slot_:  The value slot to read values from.
            """
            _xapian.ValueMapPostingSource_swiginit(self, _xapian.new_ValueMapPostingSource(slot_))

        def add_mapping(self, key, wt):
            """

            Add a mapping.

            void Xapian::ValueMapPostingSource::add_mapping(const std::string
            &key, double wt)

            Parameters:
            -----------

            key:  The key looked up from the value slot.

            wt:  The weight to give this key.
            """
            return _xapian.ValueMapPostingSource_add_mapping(self, key, wt)

        def clear_mappings(self):
            """

            Clear all mappings.

            void Xapian::ValueMapPostingSource::clear_mappings()
            """
            return _xapian.ValueMapPostingSource_clear_mappings(self)

        def set_default_weight(self, wt):
            """

            Set a default weight for document values not in the map.

            void Xapian::ValueMapPostingSource::set_default_weight(double wt)

            Parameters:
            -----------

            wt:  The weight to set as the default.
            """
            return _xapian.ValueMapPostingSource_set_default_weight(self, wt)

        __swig_destroy__ = _xapian.delete_ValueMapPostingSource
    ValueMapPostingSource.add_mapping = new_instancemethod(_xapian.ValueMapPostingSource_add_mapping, None, ValueMapPostingSource)
    ValueMapPostingSource.clear_mappings = new_instancemethod(_xapian.ValueMapPostingSource_clear_mappings, None, ValueMapPostingSource)
    ValueMapPostingSource.set_default_weight = new_instancemethod(_xapian.ValueMapPostingSource_set_default_weight, None, ValueMapPostingSource)
    ValueMapPostingSource_swigregister = _xapian.ValueMapPostingSource_swigregister
    ValueMapPostingSource_swigregister(ValueMapPostingSource)

    class FixedWeightPostingSource(PostingSource):
        """

        A posting source which returns a fixed weight for all documents.

        This returns entries for all documents in the given database, with a
        fixed weight (specified by a parameter to the constructor).
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, wt):
            """

            Construct a FixedWeightPostingSource.

            Xapian::FixedWeightPostingSource::FixedWeightPostingSource(double wt)

            Parameters:
            -----------

            wt:  The fixed weight to return.
            """
            _xapian.FixedWeightPostingSource_swiginit(self, _xapian.new_FixedWeightPostingSource(wt))
        __swig_destroy__ = _xapian.delete_FixedWeightPostingSource
    FixedWeightPostingSource_swigregister = _xapian.FixedWeightPostingSource_swigregister
    FixedWeightPostingSource_swigregister(FixedWeightPostingSource)

    class MatchSpy(object):
        """

        Abstract base class for match spies.

        The subclasses will generally accumulate information seen during the
        match, to calculate aggregate functions, or other profiles of the
        matching documents.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor, needed by subclass constructors.

            Xapian::MatchSpy::MatchSpy()
            """
            if self.__class__ == MatchSpy:
                _self = None
            else:
                _self = self
            _xapian.MatchSpy_swiginit(self, _xapian.new_MatchSpy(_self, ))
        __swig_destroy__ = _xapian.delete_MatchSpy

        def name(self):
            """

            Return the name of this match spy.

            virtual std::string Xapian::MatchSpy::name() const

            This name is used by the remote backend. It is passed with the
            serialised parameters to the remote server so that it knows which
            class to create.

            Return the full namespace-qualified name of your class here - if your
            class is called MyApp::FooMatchSpy, return "MyApp::FooMatchSpy" from
            this method.

            If you don't want to support the remote backend in your match spy, you
            can use the default implementation which simply throws
            Xapian::UnimplementedError.
            """
            return _xapian.MatchSpy_name(self)

        def merge_results(self, serialised):
            """

            Unserialise some results, and merge them into this matchspy.

            virtual void Xapian::MatchSpy::merge_results(const std::string
            &serialised)

            The order in which results are merged should not be significant, since
            this order is not specified (and will vary depending on the speed of
            the search in each sub-database).

            If you don't want to support the remote backend in your match spy, you
            can use the default implementation which simply throws
            Xapian::UnimplementedError.

            Parameters:
            -----------

            serialised:  A string containing the serialised results.
            """
            return _xapian.MatchSpy_merge_results(self, serialised)

        def __str__(self):
            """

            Return a string describing this object.

            virtual std::string Xapian::MatchSpy::get_description() const

            This default implementation returns a generic answer, to avoid forcing
            those deriving their own MatchSpy subclasses from having to implement
            this (they may not care what get_description() gives for their
            subclass).
            """
            return _xapian.MatchSpy___str__(self)

        def release(self):
            """

            Start reference counting this object.

            const MatchSpy* Xapian::MatchSpy::release() const

            You can hand ownership of a dynamically allocated MatchSpy object to
            Xapian by calling release() and then passing the object to a Xapian
            method. Xapian will arrange to delete the object once it is no longer
            required.
            """
            return _xapian.MatchSpy_release(self)

        def __disown__(self):
            self.this.disown()
            _xapian.disown_MatchSpy(self)
            return weakref_proxy(self)
    MatchSpy.__call__ = new_instancemethod(_xapian.MatchSpy___call__, None, MatchSpy)
    MatchSpy.name = new_instancemethod(_xapian.MatchSpy_name, None, MatchSpy)
    MatchSpy.merge_results = new_instancemethod(_xapian.MatchSpy_merge_results, None, MatchSpy)
    MatchSpy.__str__ = new_instancemethod(_xapian.MatchSpy___str__, None, MatchSpy)
    MatchSpy.release = new_instancemethod(_xapian.MatchSpy_release, None, MatchSpy)
    MatchSpy_swigregister = _xapian.MatchSpy_swigregister
    MatchSpy_swigregister(MatchSpy)

    class ValueCountMatchSpy(MatchSpy):
        """

        Class for counting the frequencies of values in the matching
        documents.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct a MatchSpy which counts the values in a particular slot.

            Xapian::ValueCountMatchSpy::ValueCountMatchSpy(Xapian::valueno slot_)

            """
            _xapian.ValueCountMatchSpy_swiginit(self, _xapian.new_ValueCountMatchSpy(*args))

        def get_total(self):
            """

            Return the total number of documents tallied.

            size_t Xapian::ValueCountMatchSpy::get_total() const
            """
            return _xapian.ValueCountMatchSpy_get_total(self)

        def values_begin(self):
            """

            Get an iterator over the values seen in the slot.

            TermIterator Xapian::ValueCountMatchSpy::values_begin() const

            Items will be returned in ascending alphabetical order.

            During the iteration, the frequency of the current value can be
            obtained with the get_termfreq() method on the iterator.
            """
            return _xapian.ValueCountMatchSpy_values_begin(self)

        def values_end(self):
            """

            End iterator corresponding to values_begin()

            TermIterator Xapian::ValueCountMatchSpy::values_end() const
            """
            return _xapian.ValueCountMatchSpy_values_end(self)

        def top_values_begin(self, maxvalues):
            """

            Get an iterator over the most frequent values seen in the slot.

            TermIterator Xapian::ValueCountMatchSpy::top_values_begin(size_t
            maxvalues) const

            Items will be returned in descending order of frequency. Values with
            the same frequency will be returned in ascending alphabetical order.

            During the iteration, the frequency of the current value can be
            obtained with the get_termfreq() method on the iterator.

            Parameters:
            -----------

            maxvalues:  The maximum number of values to return.
            """
            return _xapian.ValueCountMatchSpy_top_values_begin(self, maxvalues)

        def top_values_end(self, arg2):
            """

            End iterator corresponding to top_values_begin()

            TermIterator Xapian::ValueCountMatchSpy::top_values_end(size_t) const

            """
            return _xapian.ValueCountMatchSpy_top_values_end(self, arg2)

        __swig_destroy__ = _xapian.delete_ValueCountMatchSpy
    ValueCountMatchSpy.get_total = new_instancemethod(_xapian.ValueCountMatchSpy_get_total, None, ValueCountMatchSpy)
    ValueCountMatchSpy.values_begin = new_instancemethod(_xapian.ValueCountMatchSpy_values_begin, None, ValueCountMatchSpy)
    ValueCountMatchSpy.values_end = new_instancemethod(_xapian.ValueCountMatchSpy_values_end, None, ValueCountMatchSpy)
    ValueCountMatchSpy.top_values_begin = new_instancemethod(_xapian.ValueCountMatchSpy_top_values_begin, None, ValueCountMatchSpy)
    ValueCountMatchSpy.top_values_end = new_instancemethod(_xapian.ValueCountMatchSpy_top_values_end, None, ValueCountMatchSpy)
    ValueCountMatchSpy_swigregister = _xapian.ValueCountMatchSpy_swigregister
    ValueCountMatchSpy_swigregister(ValueCountMatchSpy)

    def miles_to_metres(miles):
        return _xapian.miles_to_metres(miles)
    miles_to_metres = _xapian.miles_to_metres

    def metres_to_miles(metres):
        return _xapian.metres_to_miles(metres)
    metres_to_miles = _xapian.metres_to_miles
    class LatLongCoord(object):
        """

        A latitude-longitude coordinate.

        Experimental - seehttps://xapian.org/docs/deprecation#experimental-
        features

        Note that latitude-longitude coordinates are only precisely meaningful
        if the datum used to define them is specified. This class ignores this
        issue - it is up to the caller to ensure that the datum used for each
        coordinate in a system is consistent.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr
        latitude = property(_xapian.LatLongCoord_latitude_get, _xapian.LatLongCoord_latitude_set)
        longitude = property(_xapian.LatLongCoord_longitude_get, _xapian.LatLongCoord_longitude_set)

        def __init__(self, *args):
            """

            Construct a coordinate.

            Xapian::LatLongCoord::LatLongCoord(double latitude_, double
            longitude_)

            If the supplied longitude is out of the standard range, it will be
            normalised to the range 0 <= longitude < 360.

            If you want to avoid the checks (for example, you know that your
            values are already in range), you can use the alternate constructor to
            construct an uninitialised coordinate, and then set the latitude and
            longitude directly.

            Parameters:
            -----------

            InvalidArgumentError:  the supplied latitude is out of range.
            """
            _xapian.LatLongCoord_swiginit(self, _xapian.new_LatLongCoord(*args))

        def unserialise(self, serialised):
            """

            Unserialise a buffer and set this object to its coordinate.

            void Xapian::LatLongCoord::unserialise(const char **ptr, const char
            *end)

            The buffer may contain further data after that for the coordinate.

            Parameters:
            -----------

            ptr:  A pointer to the start of the string. This will be updated to
            point to the end of the data representing the coordinate.

            end:  A pointer to the end of the string.

            Parameters:
            -----------

            Xapian::SerialisationError:  if the string does not start with a valid
            serialised latitude- longitude pair.
            """
            return _xapian.LatLongCoord_unserialise(self, serialised)

        def serialise(self):
            """

            Return a serialised representation of the coordinate.

            std::string Xapian::LatLongCoord::serialise() const
            """
            return _xapian.LatLongCoord_serialise(self)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::LatLongCoord::get_description() const
            """
            return _xapian.LatLongCoord___str__(self)

        __swig_destroy__ = _xapian.delete_LatLongCoord
    LatLongCoord.unserialise = new_instancemethod(_xapian.LatLongCoord_unserialise, None, LatLongCoord)
    LatLongCoord.serialise = new_instancemethod(_xapian.LatLongCoord_serialise, None, LatLongCoord)
    LatLongCoord.__str__ = new_instancemethod(_xapian.LatLongCoord___str__, None, LatLongCoord)
    LatLongCoord_swigregister = _xapian.LatLongCoord_swigregister
    LatLongCoord_swigregister(LatLongCoord)

    class LatLongCoordsIterator(object):
        """

        An iterator across the values in a LatLongCoords object.

        Experimental - seehttps://xapian.org/docs/deprecation#experimental-
        features
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self):
            """

            Default constructor. Produces an uninitialised iterator.

            Xapian::LatLongCoordsIterator::LatLongCoordsIterator()
            """
            _xapian.LatLongCoordsIterator_swiginit(self, _xapian.new_LatLongCoordsIterator())
        __swig_destroy__ = _xapian.delete_LatLongCoordsIterator
    LatLongCoordsIterator.__eq__ = new_instancemethod(_xapian.LatLongCoordsIterator___eq__, None, LatLongCoordsIterator)
    LatLongCoordsIterator.equals = new_instancemethod(_xapian.LatLongCoordsIterator_equals, None, LatLongCoordsIterator)
    LatLongCoordsIterator.get_coord = new_instancemethod(_xapian.LatLongCoordsIterator_get_coord, None, LatLongCoordsIterator)
    LatLongCoordsIterator.next = new_instancemethod(_xapian.LatLongCoordsIterator_next, None, LatLongCoordsIterator)
    LatLongCoordsIterator_swigregister = _xapian.LatLongCoordsIterator_swigregister
    LatLongCoordsIterator_swigregister(LatLongCoordsIterator)

    class LatLongCoords(object):
        """

        A sequence of latitude-longitude coordinates.

        Experimental - seehttps://xapian.org/docs/deprecation#experimental-
        features
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def begin(self):
            """

            Get a begin iterator for the coordinates.

            LatLongCoordsIterator Xapian::LatLongCoords::begin() const
            """
            return _xapian.LatLongCoords_begin(self)

        def end(self):
            """

            Get an end iterator for the coordinates.

            LatLongCoordsIterator Xapian::LatLongCoords::end() const
            """
            return _xapian.LatLongCoords_end(self)

        def size(self):
            """

            Get the number of coordinates in the container.

            size_t Xapian::LatLongCoords::size() const
            """
            return _xapian.LatLongCoords_size(self)

        def empty(self):
            """

            Return true if and only if there are no coordinates in the container.

            bool Xapian::LatLongCoords::empty() const
            """
            return _xapian.LatLongCoords_empty(self)

        def append(self, coord):
            """

            Append a coordinate to the end of the sequence.

            void Xapian::LatLongCoords::append(const LatLongCoord &coord)
            """
            return _xapian.LatLongCoords_append(self, coord)

        def __init__(self, *args):
            """

            Construct a container holding one coordinate.

            Xapian::LatLongCoords::LatLongCoords(const LatLongCoord &coord)
            """
            _xapian.LatLongCoords_swiginit(self, _xapian.new_LatLongCoords(*args))

        def unserialise(self, serialised):
            """

            Unserialise a string and set this object to the coordinates in it.

            void Xapian::LatLongCoords::unserialise(const std::string &serialised)

            Parameters:
            -----------

            serialised:  the string to unserialise the coordinates from.

            Parameters:
            -----------

            Xapian::SerialisationError:  if the string does not contain a valid
            serialised latitude-longitude pair, or contains junk at the end of it.

            """
            return _xapian.LatLongCoords_unserialise(self, serialised)

        def serialise(self):
            """

            Return a serialised form of the coordinate list.

            std::string Xapian::LatLongCoords::serialise() const
            """
            return _xapian.LatLongCoords_serialise(self)

        def __str__(self):
            """

            Return a string describing this object.

            std::string Xapian::LatLongCoords::get_description() const
            """
            return _xapian.LatLongCoords___str__(self)

        __swig_destroy__ = _xapian.delete_LatLongCoords
    LatLongCoords.begin = new_instancemethod(_xapian.LatLongCoords_begin, None, LatLongCoords)
    LatLongCoords.end = new_instancemethod(_xapian.LatLongCoords_end, None, LatLongCoords)
    LatLongCoords.size = new_instancemethod(_xapian.LatLongCoords_size, None, LatLongCoords)
    LatLongCoords.empty = new_instancemethod(_xapian.LatLongCoords_empty, None, LatLongCoords)
    LatLongCoords.append = new_instancemethod(_xapian.LatLongCoords_append, None, LatLongCoords)
    LatLongCoords.unserialise = new_instancemethod(_xapian.LatLongCoords_unserialise, None, LatLongCoords)
    LatLongCoords.serialise = new_instancemethod(_xapian.LatLongCoords_serialise, None, LatLongCoords)
    LatLongCoords.__str__ = new_instancemethod(_xapian.LatLongCoords___str__, None, LatLongCoords)
    LatLongCoords_swigregister = _xapian.LatLongCoords_swigregister
    LatLongCoords_swigregister(LatLongCoords)

    def __ne__(*args):
        return _xapian.__ne__(*args)
    __ne__ = _xapian.__ne__
    class LatLongMetric(object):
        """

        Base class for calculating distances between two lat/long coordinates.

        Experimental - seehttps://xapian.org/docs/deprecation#experimental-
        features
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr
        __swig_destroy__ = _xapian.delete_LatLongMetric

        def pointwise_distance(self, a, b):
            """

            Return the distance between two coordinates, in metres.

            virtual double Xapian::LatLongMetric::pointwise_distance(const
            LatLongCoord &a, const LatLongCoord &b) const =0
            """
            return _xapian.LatLongMetric_pointwise_distance(self, a, b)

        def name(self):
            """

            Return the full name of the metric.

            virtual std::string Xapian::LatLongMetric::name() const =0

            This is used when serialising and unserialising metrics; for example,
            for performing remote searches.

            If the subclass is in a C++ namespace, the namespace should be
            included in the name, using "::" as a separator. For example, for a
            LatLongMetric subclass called "FooLatLongMetric" in the "Xapian"
            namespace the result of this call should be
            "Xapian::FooLatLongMetric".
            """
            return _xapian.LatLongMetric_name(self)

        def __init__(self):
            if self.__class__ == LatLongMetric:
                _self = None
            else:
                _self = self
            _xapian.LatLongMetric_swiginit(self, _xapian.new_LatLongMetric(_self, ))
        def __disown__(self):
            self.this.disown()
            _xapian.disown_LatLongMetric(self)
            return weakref_proxy(self)
    LatLongMetric.pointwise_distance = new_instancemethod(_xapian.LatLongMetric_pointwise_distance, None, LatLongMetric)
    LatLongMetric.__call__ = new_instancemethod(_xapian.LatLongMetric___call__, None, LatLongMetric)
    LatLongMetric.name = new_instancemethod(_xapian.LatLongMetric_name, None, LatLongMetric)
    LatLongMetric_swigregister = _xapian.LatLongMetric_swigregister
    LatLongMetric_swigregister(LatLongMetric)

    class GreatCircleMetric(LatLongMetric):
        """

        Calculate the great-circle distance between two coordinates on a
        sphere.

        Experimental - seehttps://xapian.org/docs/deprecation#experimental-
        features

        This uses the haversine formula to calculate the distance. Note that
        this formula is subject to inaccuracy due to numerical errors for
        coordinates on the opposite side of the sphere.

        Seehttps://en.wikipedia.org/wiki/Haversine_formula
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct a GreatCircleMetric using a specified radius.

            Xapian::GreatCircleMetric::GreatCircleMetric(double radius_)

            This is useful for data sets in which the points are not on Earth (eg,
            a database of features on Mars).

            Parameters:
            -----------

            radius_:  The radius of the sphere to use, in metres.
            """
            _xapian.GreatCircleMetric_swiginit(self, _xapian.new_GreatCircleMetric(*args))
        __swig_destroy__ = _xapian.delete_GreatCircleMetric
    GreatCircleMetric_swigregister = _xapian.GreatCircleMetric_swigregister
    GreatCircleMetric_swigregister(GreatCircleMetric)

    class LatLongDistancePostingSource(ValuePostingSource):
        """

        Posting source which returns a weight based on geospatial distance.

        Experimental - seehttps://xapian.org/docs/deprecation#experimental-
        features

        Results are weighted by the distance from a fixed point, or list of
        points, calculated according to the metric supplied. If multiple
        points are supplied (either in the constructor, or in the coordinates
        stored in a document), the closest pointwise distance is used.

        Documents further away than a specified maximum range (or with no
        location stored in the specified slot) will not be returned.

        The weight returned is computed from the distance using the formula:

        k1 * pow(distance + k1, -k2)

        (Where k1 and k2 are (strictly) positive, floating point constants,
        which default to 1000 and 1, respectively. Distance is measured in
        metres, so this means that something at the centre gets a weight of
        1.0, something 1km away gets a weight of 0.5, and something 3km away
        gets a weight of 0.25, etc)
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct a new posting source which returns only documents within
            range of one of the central coordinates.

            Xapian::LatLongDistancePostingSource::LatLongDistancePostingSource(Xapian::valueno
            slot_, const LatLongCoords &centre_, double max_range_=0.0, double
            k1_=1000.0, double k2_=1.0)

            Parameters:
            -----------

            slot_:  The value slot to read values from.

            centre_:  The centre point to use for distance calculations.

            max_range_:  The maximum distance for documents which are returned.

            k1_:  The k1 constant to use in the weighting function.

            k2_:  The k2 constant to use in the weighting function.

            Xapian::GreatCircleMetric is used as the metric.
            """
            _xapian.LatLongDistancePostingSource_swiginit(self, _xapian.new_LatLongDistancePostingSource(*args))
        __swig_destroy__ = _xapian.delete_LatLongDistancePostingSource
    LatLongDistancePostingSource_swigregister = _xapian.LatLongDistancePostingSource_swigregister
    LatLongDistancePostingSource_swigregister(LatLongDistancePostingSource)

    class LatLongDistanceKeyMaker(KeyMaker):
        """

        KeyMaker subclass which sorts by distance from a latitude/longitude.

        Experimental - seehttps://xapian.org/docs/deprecation#experimental-
        features

        Results are ordered by the distance from a fixed point, or list of
        points, calculated according to the metric supplied. If multiple
        points are supplied (either in the constructor, or in the coordinates
        stored in a document), the closest pointwise distance is used.

        If a document contains no coordinate stored in the specified slot, a
        special value for the distance will be used. This defaults to a large
        number, so that such results get a low rank, but may be specified by a
        constructor parameter.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def __init__(self, *args):
            """

            Construct a LatLongDistanceKeyMaker.

            Xapian::LatLongDistanceKeyMaker::LatLongDistanceKeyMaker(Xapian::valueno
            slot_, const LatLongCoord &centre_)

            Parameters:
            -----------

            slot_:  Value slot to use.

            centre_:  Point to calculate distance from.

            Xapian::GreatCircleMetric is used as the metric.

            Documents where no value is set are assumed to be a large distance
            away.
            """
            _xapian.LatLongDistanceKeyMaker_swiginit(self, _xapian.new_LatLongDistanceKeyMaker(*args))
        __swig_destroy__ = _xapian.delete_LatLongDistanceKeyMaker
    LatLongDistanceKeyMaker_swigregister = _xapian.LatLongDistanceKeyMaker_swigregister
    LatLongDistanceKeyMaker_swigregister(LatLongDistanceKeyMaker)

    class Database(object):
        """

        This class is used to access a database, or a group of databases.

        For searching, this class is used in conjunction with an Enquire
        object.

        Parameters:
        -----------

        InvalidArgumentError:  will be thrown if an invalid argument is
        supplied, for example, an unknown database type.

        DatabaseOpeningError:  may be thrown if the database cannot be opened
        (for example, a required file cannot be found).

        DatabaseVersionError:  may be thrown if the database is in an
        unsupported format (for example, created by a newer version of Xapian
        which uses an incompatible format).
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr

        def add_database(self, database):
            """

            Add an existing database (or group of databases) to those accessed by
            this object.

            void Xapian::Database::add_database(const Database &database)

            Parameters:
            -----------

            database:  the database(s) to add.
            """
            return _xapian.Database_add_database(self, database)

        def __init__(self, *args):
            """

            Copying is allowed.

            Xapian::Database::Database(const Database &other)

            The internals are reference counted, so copying is cheap.

            Parameters:
            -----------

            other:  The object to copy.
            """
            _xapian.Database_swiginit(self, _xapian.new_Database(*args))
        __swig_destroy__ = _xapian.delete_Database

        def reopen(self):
            """

            Re-open the database.

            bool Xapian::Database::reopen()

            This re-opens the database(s) to the latest available version(s). It
            can be used either to make sure the latest results are returned, or to
            recover from a Xapian::DatabaseModifiedError.

            Calling reopen() on a database which has been closed (with  close())
            will always raise a Xapian::DatabaseError.

            true if the database might have been reopened (if false is returned,
            the database definitely hasn't been reopened, which applications may
            find useful when caching results, etc). In Xapian < 1.3.0, this method
            did not return a value.
            """
            return _xapian.Database_reopen(self)

        def close(self):
            """

            Close the database.

            virtual void Xapian::Database::close()

            This closes the database and closes all its file handles.

            For a WritableDatabase, if a transaction is active it will be aborted,
            while if no transaction is active commit() will be implicitly called.
            Also the write lock is released.

            Closing a database cannot be undone - in particular, calling reopen()
            after close() will not reopen it, but will instead throw a
            Xapian::DatabaseError exception.

            Calling close() again on a database which has already been closed has
            no effect (and doesn't raise an exception).

            After close() has been called, calls to other methods of the database,
            and to methods of other objects associated with the database, will
            either:

            behave exactly as they would have done if the database had not been
            closed (this can only happen if all the required data is cached)

            raise a Xapian::DatabaseError exception indicating that the database
            is closed.

            The reason for this behaviour is that otherwise we'd have to check
            that the database is still open on every method call on every object
            associated with a Database, when in many cases they are working on
            data which has already been loaded and so they are able to just behave
            correctly.

            This method was added in Xapian 1.1.0.
            """
            return _xapian.Database_close(self)

        def __str__(self):
            """

            Return a string describing this object.

            virtual std::string Xapian::Database::get_description() const
            """
            return _xapian.Database___str__(self)

        def _postlist_begin(self, tname):
            """

            An iterator pointing to the start of the postlist for a given term.

            PostingIterator Xapian::Database::postlist_begin(const std::string
            &tname) const

            Parameters:
            -----------

            tname:  The termname to iterate postings for. If the term name is the
            empty string, the iterator returned will list all the documents in the
            database. Such an iterator will always return a WDF value of 1, since
            there is no obvious meaning for this quantity in this case.
            """
            return _xapian.Database__postlist_begin(self, tname)

        def _postlist_end(self, arg2):
            """

            Corresponding end iterator to postlist_begin().

            PostingIterator Xapian::Database::postlist_end(const std::string &)
            const
            """
            return _xapian.Database__postlist_end(self, arg2)

        def _termlist_begin(self, did):
            """

            An iterator pointing to the start of the termlist for a given
            document.

            TermIterator Xapian::Database::termlist_begin(Xapian::docid did) const

            Parameters:
            -----------

            did:  The document id of the document to iterate terms for.
            """
            return _xapian.Database__termlist_begin(self, did)

        def _termlist_end(self, arg2):
            """

            Corresponding end iterator to termlist_begin().

            TermIterator Xapian::Database::termlist_end(Xapian::docid) const
            """
            return _xapian.Database__termlist_end(self, arg2)

        def has_positions(self):
            """

            Does this database have any positional information?

            bool Xapian::Database::has_positions() const
            """
            return _xapian.Database_has_positions(self)

        def _positionlist_begin(self, did, tname):
            """

            An iterator pointing to the start of the position list for a given
            term in a given document.

            PositionIterator Xapian::Database::positionlist_begin(Xapian::docid
            did, const std::string &tname) const
            """
            return _xapian.Database__positionlist_begin(self, did, tname)

        def _positionlist_end(self, arg2, arg3):
            """

            Corresponding end iterator to positionlist_begin().

            PositionIterator Xapian::Database::positionlist_end(Xapian::docid,
            const std::string &) const
            """
            return _xapian.Database__positionlist_end(self, arg2, arg3)

        def _allterms_begin(self, *args):
            """

            An iterator which runs across all terms with a given prefix.

            TermIterator Xapian::Database::allterms_begin(const std::string
            &prefix=std::string()) const

            Parameters:
            -----------

            prefix:  The prefix to restrict the returned terms to (default:
            iterate all terms)
            """
            return _xapian.Database__allterms_begin(self, *args)

        def _allterms_end(self, *args):
            """

            Corresponding end iterator to allterms_begin(prefix).

            TermIterator Xapian::Database::allterms_end(const std::string
            &=std::string()) const
            """
            return _xapian.Database__allterms_end(self, *args)

        def get_doccount(self):
            """

            Get the number of documents in the database.

            Xapian::doccount Xapian::Database::get_doccount() const
            """
            return _xapian.Database_get_doccount(self)

        def get_lastdocid(self):
            """

            Get the highest document id which has been used in the database.

            Xapian::docid Xapian::Database::get_lastdocid() const
            """
            return _xapian.Database_get_lastdocid(self)

        def get_avlength(self):
            """

            Get the average length of the documents in the database.

            Xapian::doclength Xapian::Database::get_avlength() const
            """
            return _xapian.Database_get_avlength(self)

        def get_total_length(self):
            """

            Get the total length of all the documents in the database.

            Xapian::totallength Xapian::Database::get_total_length() const

            Added in Xapian 1.4.5.
            """
            return _xapian.Database_get_total_length(self)

        def get_termfreq(self, tname):
            """

            Get the number of documents in the database indexed by a given term.

            Xapian::doccount Xapian::Database::get_termfreq(const std::string
            &tname) const
            """
            return _xapian.Database_get_termfreq(self, tname)

        def term_exists(self, tname):
            """

            Check if a given term exists in the database.

            bool Xapian::Database::term_exists(const std::string &tname) const

            Parameters:
            -----------

            tname:  The term to test the existence of.

            true if and only if the term exists in the database. This is the same
            as (get_termfreq(tname) != 0), but will often be more efficient.
            """
            return _xapian.Database_term_exists(self, tname)

        def get_collection_freq(self, tname):
            """

            Return the total number of occurrences of the given term.

            Xapian::termcount Xapian::Database::get_collection_freq(const
            std::string &tname) const

            This is the sum of the number of occurrences of the term in each
            document it indexes: i.e., the sum of the within document frequencies
            of the term.

            Parameters:
            -----------

            tname:  The term whose collection frequency is being requested.
            """
            return _xapian.Database_get_collection_freq(self, tname)

        def get_value_freq(self, slot):
            """

            Return the frequency of a given value slot.

            Xapian::doccount Xapian::Database::get_value_freq(Xapian::valueno
            slot) const

            This is the number of documents which have a (non-empty) value stored
            in the slot.

            Parameters:
            -----------

            slot:  The value slot to examine.
            """
            return _xapian.Database_get_value_freq(self, slot)

        def get_value_lower_bound(self, slot):
            """

            Get a lower bound on the values stored in the given value slot.

            std::string Xapian::Database::get_value_lower_bound(Xapian::valueno
            slot) const

            If there are no values stored in the given value slot, this will
            return an empty string.

            Parameters:
            -----------

            slot:  The value slot to examine.
            """
            return _xapian.Database_get_value_lower_bound(self, slot)

        def get_value_upper_bound(self, slot):
            """

            Get an upper bound on the values stored in the given value slot.

            std::string Xapian::Database::get_value_upper_bound(Xapian::valueno
            slot) const

            If there are no values stored in the given value slot, this will
            return an empty string.

            Parameters:
            -----------

            slot:  The value slot to examine.
            """
            return _xapian.Database_get_value_upper_bound(self, slot)

        def get_doclength_lower_bound(self):
            """

            Get a lower bound on the length of a document in this DB.

            Xapian::termcount Xapian::Database::get_doclength_lower_bound() const

            This bound does not include any zero-length documents.
            """
            return _xapian.Database_get_doclength_lower_bound(self)

        def get_doclength_upper_bound(self):
            """

            Get an upper bound on the length of a document in this DB.

            Xapian::termcount Xapian::Database::get_doclength_upper_bound() const

            """
            return _xapian.Database_get_doclength_upper_bound(self)

        def get_wdf_upper_bound(self, term):
            """

            Get an upper bound on the wdf of term term.

            Xapian::termcount Xapian::Database::get_wdf_upper_bound(const
            std::string &term) const
            """
            return _xapian.Database_get_wdf_upper_bound(self, term)

        def valuestream_begin(self, slot):
            """

            Return an iterator over the value in slot slot for each document.

            ValueIterator Xapian::Database::valuestream_begin(Xapian::valueno
            slot) const
            """
            return _xapian.Database_valuestream_begin(self, slot)

        def valuestream_end(self, arg2):
            """

            Return end iterator corresponding to valuestream_begin().

            ValueIterator Xapian::Database::valuestream_end(Xapian::valueno) const

            """
            return _xapian.Database_valuestream_end(self, arg2)

        def get_doclength(self, did):
            """

            Get the length of a document.

            Xapian::termcount Xapian::Database::get_doclength(Xapian::docid did)
            const
            """
            return _xapian.Database_get_doclength(self, did)

        def get_unique_terms(self, did):
            """

            Get the number of unique terms in document.

            Xapian::termcount Xapian::Database::get_unique_terms(Xapian::docid
            did) const
            """
            return _xapian.Database_get_unique_terms(self, did)

        def keep_alive(self):
            """

            Send a "keep-alive" to remote databases to stop them timing out.

            void Xapian::Database::keep_alive()

            Has no effect on non-remote databases.
            """
            return _xapian.Database_keep_alive(self)

        def get_document(self, *args):
            """

            Get a document from the database, given its document id.

            Xapian::Document Xapian::Database::get_document(Xapian::docid did,
            unsigned flags) const

            This method returns a Xapian::Document object which provides the
            information about a document.

            Parameters:
            -----------

            did:  The document id of the document to retrieve.

            flags:  Zero or more flags bitwise-or-ed together (currently only
            Xapian::DOC_ASSUME_VALID is supported).

            A Xapian::Document object containing the document data

            Parameters:
            -----------

            Xapian::DocNotFoundError:  The document specified could not be found
            in the database.

            Xapian::InvalidArgumentError:  did was 0, which is not a valid
            document id.
            """
            return _xapian.Database_get_document(self, *args)

        def get_spelling_suggestion(self, word, max_edit_distance=2):
            """

            Suggest a spelling correction.

            std::string Xapian::Database::get_spelling_suggestion(const
            std::string &word, unsigned max_edit_distance=2) const

            Parameters:
            -----------

            word:  The potentially misspelled word.

            max_edit_distance:  Only consider words which are at most
            max_edit_distance edits from word. An edit is a character insertion,
            deletion, or the transposition of two adjacent characters (default is
            2).
            """
            return _xapian.Database_get_spelling_suggestion(self, word, max_edit_distance)

        def _spellings_begin(self):
            """

            An iterator which returns all the spelling correction targets.

            Xapian::TermIterator Xapian::Database::spellings_begin() const

            This returns all the words which are considered as targets for the
            spelling correction algorithm. The frequency of each word is available
            as the term frequency of each entry in the returned iterator.
            """
            return _xapian.Database__spellings_begin(self)

        def _spellings_end(self):
            """

            Corresponding end iterator to spellings_begin().

            Xapian::TermIterator Xapian::Database::spellings_end() const
            """
            return _xapian.Database__spellings_end(self)

        def _synonyms_begin(self, term):
            """

            An iterator which returns all the synonyms for a given term.

            Xapian::TermIterator Xapian::Database::synonyms_begin(const
            std::string &term) const

            Parameters:
            -----------

            term:  The term to return synonyms for.
            """
            return _xapian.Database__synonyms_begin(self, term)

        def _synonyms_end(self, arg2):
            """

            Corresponding end iterator to synonyms_begin(term).

            Xapian::TermIterator Xapian::Database::synonyms_end(const std::string
            &) const
            """
            return _xapian.Database__synonyms_end(self, arg2)

        def _synonym_keys_begin(self, *args):
            """

            An iterator which returns all terms which have synonyms.

            Xapian::TermIterator Xapian::Database::synonym_keys_begin(const
            std::string &prefix=std::string()) const

            Parameters:
            -----------

            prefix:  If non-empty, only terms with this prefix are returned.
            """
            return _xapian.Database__synonym_keys_begin(self, *args)

        def _synonym_keys_end(self, *args):
            """

            Corresponding end iterator to synonym_keys_begin(prefix).

            Xapian::TermIterator Xapian::Database::synonym_keys_end(const
            std::string &=std::string()) const
            """
            return _xapian.Database__synonym_keys_end(self, *args)

        def get_metadata(self, key):
            """

            Get the user-specified metadata associated with a given key.

            std::string Xapian::Database::get_metadata(const std::string &key)
            const

            User-specified metadata allows you to store arbitrary information in
            the form of (key, value) pairs. See  WritableDatabase::set_metadata()
            for more information.

            When invoked on a Xapian::Database object representing multiple
            databases, currently only the metadata for the first is considered but
            this behaviour may change in the future.

            If there is no piece of metadata associated with the specified key, an
            empty string is returned (this applies even for backends which don't
            support metadata).

            Empty keys are not valid, and specifying one will cause an exception.

            Parameters:
            -----------

            key:  The key of the metadata item to access.

            The retrieved metadata item's value.

            Parameters:
            -----------

            Xapian::InvalidArgumentError:  will be thrown if the key supplied is
            empty.
            """
            return _xapian.Database_get_metadata(self, key)

        def _metadata_keys_begin(self, *args):
            """

            An iterator which returns all user-specified metadata keys.

            Xapian::TermIterator Xapian::Database::metadata_keys_begin(const
            std::string &prefix=std::string()) const

            When invoked on a Xapian::Database object representing multiple
            databases, currently only the metadata for the first is considered but
            this behaviour may change in the future.

            If the backend doesn't support metadata, then this method returns an
            iterator which compares equal to that returned by metadata_keys_end().

            Parameters:
            -----------

            prefix:  If non-empty, only keys with this prefix are returned.

            Parameters:
            -----------

            Xapian::UnimplementedError:  will be thrown if the backend implements
            user-specified metadata, but doesn't implement iterating its keys
            (currently this happens for the InMemory backend).
            """
            return _xapian.Database__metadata_keys_begin(self, *args)

        def _metadata_keys_end(self, *args):
            """

            Corresponding end iterator to metadata_keys_begin().

            Xapian::TermIterator Xapian::Database::metadata_keys_end(const
            std::string &=std::string()) const
            """
            return _xapian.Database__metadata_keys_end(self, *args)

        def get_uuid(self):
            """

            Get a UUID for the database.

            std::string Xapian::Database::get_uuid() const

            The UUID will persist for the lifetime of the database.

            Replicas (eg, made with the replication protocol, or by copying all
            the database files) will have the same UUID. However, copies (made
            with copydatabase, or xapian-compact) will have different UUIDs.

            If the backend does not support UUIDs or this database has no
            subdatabases, the UUID will be empty.

            If this database has multiple sub-databases, the UUID string will
            contain the UUIDs of all the sub-databases.
            """
            return _xapian.Database_get_uuid(self)

        def locked(self):
            """

            Test if this database is currently locked for writing.

            bool Xapian::Database::locked() const

            If the underlying object is actually a WritableDatabase, always
            returns true.

            Otherwise tests if there's a writer holding the lock (or if we can't
            test for a lock without taking it on the current platform, throw
            Xapian::UnimplementedError). If there's an error while trying to test
            the lock, throws Xapian::DatabaseLockError.

            For multi-databases, this tests each sub-database and returns true if
            any of them are locked.
            """
            return _xapian.Database_locked(self)

        def get_revision(self):
            """

            Get the revision of the database.

            Xapian::rev Xapian::Database::get_revision() const

            The revision is an unsigned integer which increases with each commit.

            The database must have exactly one sub-database, which must be of type
            chert or glass. Otherwise an exception will be thrown.

            Experimental - seehttps://xapian.org/docs/deprecation#experimental-
            features
            """
            return _xapian.Database_get_revision(self)

        check = staticmethod(_xapian.Database_check)

        def compact(self, *args):
            """

            Produce a compact version of this database.

            void Xapian::Database::compact(int fd, unsigned flags, int block_size,
            Xapian::Compactor &compactor)

            New 1.3.4. Various methods of the Compactor class were deprecated in
            1.3.4.

            The compactor functor allows handling progress output and specifying
            how user metadata is merged.

            This variant writes a single-file database to the specified file
            descriptor. Only the glass backend supports such databases, so this
            form is only supported for this backend.

            Parameters:
            -----------

            fd:  File descriptor to write the compact version to. The descriptor
            needs to be readable and writable (open with O_RDWR) and seekable. The
            current file offset is used, allowing compacting to a single file
            database embedded within another file. Xapian takes ownership of the
            file descriptor and will close it before returning.

            flags:  Any of the following combined using bitwise-or (| in C++):
            Xapian::DBCOMPACT_NO_RENUMBER By default the document ids will be
            renumbered the output - currently by applying the same offset to all
            the document ids in a particular source database. If this flag is
            specified, then this renumbering doesn't happen, but all the document
            ids must be unique over all source databases. Currently the ranges of
            document ids in each source must not overlap either, though this
            restriction may be removed in the future.

            Xapian::DBCOMPACT_MULTIPASS If merging more than 3 databases, merge
            the postlists in multiple passes, which is generally faster but
            requires more disk space for temporary files.

            Xapian::DBCOMPACT_SINGLE_FILE Produce a single-file database (only
            supported for glass currently) - this flag is implied in this form and
            need not be specified explicitly.

            block_size:  This specifies the block size (in bytes) for to use for
            the output. For glass, the block size must be a power of 2 between
            2048 and 65536 (inclusive), and the default (also used if an invalid
            value is passed) is 8192 bytes.

            compactor:  Functor
            """
            return _xapian.Database_compact(self, *args)

    Database.add_database = new_instancemethod(_xapian.Database_add_database, None, Database)
    Database.reopen = new_instancemethod(_xapian.Database_reopen, None, Database)
    Database.close = new_instancemethod(_xapian.Database_close, None, Database)
    Database.__str__ = new_instancemethod(_xapian.Database___str__, None, Database)
    Database._postlist_begin = new_instancemethod(_xapian.Database__postlist_begin, None, Database)
    Database._postlist_end = new_instancemethod(_xapian.Database__postlist_end, None, Database)
    Database._termlist_begin = new_instancemethod(_xapian.Database__termlist_begin, None, Database)
    Database._termlist_end = new_instancemethod(_xapian.Database__termlist_end, None, Database)
    Database.has_positions = new_instancemethod(_xapian.Database_has_positions, None, Database)
    Database._positionlist_begin = new_instancemethod(_xapian.Database__positionlist_begin, None, Database)
    Database._positionlist_end = new_instancemethod(_xapian.Database__positionlist_end, None, Database)
    Database._allterms_begin = new_instancemethod(_xapian.Database__allterms_begin, None, Database)
    Database._allterms_end = new_instancemethod(_xapian.Database__allterms_end, None, Database)
    Database.get_doccount = new_instancemethod(_xapian.Database_get_doccount, None, Database)
    Database.get_lastdocid = new_instancemethod(_xapian.Database_get_lastdocid, None, Database)
    Database.get_avlength = new_instancemethod(_xapian.Database_get_avlength, None, Database)
    Database.get_total_length = new_instancemethod(_xapian.Database_get_total_length, None, Database)
    Database.get_termfreq = new_instancemethod(_xapian.Database_get_termfreq, None, Database)
    Database.term_exists = new_instancemethod(_xapian.Database_term_exists, None, Database)
    Database.get_collection_freq = new_instancemethod(_xapian.Database_get_collection_freq, None, Database)
    Database.get_value_freq = new_instancemethod(_xapian.Database_get_value_freq, None, Database)
    Database.get_value_lower_bound = new_instancemethod(_xapian.Database_get_value_lower_bound, None, Database)
    Database.get_value_upper_bound = new_instancemethod(_xapian.Database_get_value_upper_bound, None, Database)
    Database.get_doclength_lower_bound = new_instancemethod(_xapian.Database_get_doclength_lower_bound, None, Database)
    Database.get_doclength_upper_bound = new_instancemethod(_xapian.Database_get_doclength_upper_bound, None, Database)
    Database.get_wdf_upper_bound = new_instancemethod(_xapian.Database_get_wdf_upper_bound, None, Database)
    Database.valuestream_begin = new_instancemethod(_xapian.Database_valuestream_begin, None, Database)
    Database.valuestream_end = new_instancemethod(_xapian.Database_valuestream_end, None, Database)
    Database.get_doclength = new_instancemethod(_xapian.Database_get_doclength, None, Database)
    Database.get_unique_terms = new_instancemethod(_xapian.Database_get_unique_terms, None, Database)
    Database.keep_alive = new_instancemethod(_xapian.Database_keep_alive, None, Database)
    Database.get_document = new_instancemethod(_xapian.Database_get_document, None, Database)
    Database.get_spelling_suggestion = new_instancemethod(_xapian.Database_get_spelling_suggestion, None, Database)
    Database._spellings_begin = new_instancemethod(_xapian.Database__spellings_begin, None, Database)
    Database._spellings_end = new_instancemethod(_xapian.Database__spellings_end, None, Database)
    Database._synonyms_begin = new_instancemethod(_xapian.Database__synonyms_begin, None, Database)
    Database._synonyms_end = new_instancemethod(_xapian.Database__synonyms_end, None, Database)
    Database._synonym_keys_begin = new_instancemethod(_xapian.Database__synonym_keys_begin, None, Database)
    Database._synonym_keys_end = new_instancemethod(_xapian.Database__synonym_keys_end, None, Database)
    Database.get_metadata = new_instancemethod(_xapian.Database_get_metadata, None, Database)
    Database._metadata_keys_begin = new_instancemethod(_xapian.Database__metadata_keys_begin, None, Database)
    Database._metadata_keys_end = new_instancemethod(_xapian.Database__metadata_keys_end, None, Database)
    Database.get_uuid = new_instancemethod(_xapian.Database_get_uuid, None, Database)
    Database.locked = new_instancemethod(_xapian.Database_locked, None, Database)
    Database.get_revision = new_instancemethod(_xapian.Database_get_revision, None, Database)
    Database.compact = new_instancemethod(_xapian.Database_compact, None, Database)
    Database_swigregister = _xapian.Database_swigregister
    Database_swigregister(Database)

    def Database_check(fd, opts=0, out=None):
        return _xapian.Database_check(fd, opts, out)
    Database_check = _xapian.Database_check

    class WritableDatabase(Database):
        """

        This class provides read/write access to a database.
        """

        thisown = property(lambda x: x.this.own(), lambda x, v: x.this.own(v), doc='The membership flag')
        __repr__ = _swig_repr
        __swig_destroy__ = _xapian.delete_WritableDatabase

        def __init__(self, *args):
            """

            Copying is allowed.

            Xapian::WritableDatabase::WritableDatabase(const WritableDatabase
            &other)

            The internals are reference counted, so copying is cheap.

            Parameters:
            -----------

            other:  The object to copy.
            """
            _xapian.WritableDatabase_swiginit(self, _xapian.new_WritableDatabase(*args))

        def commit(self):
            """

            Commit any pending modifications made to the database.

            void Xapian::WritableDatabase::commit()

            For efficiency reasons, when performing multiple updates to a database
            it is best (indeed, almost essential) to make as many modifications as
            memory will permit in a single pass through the database. To ensure
            this, Xapian batches up modifications.

            This method may be called at any time to commit any pending
            modifications to the database.

            If any of the modifications fail, an exception will be thrown and the
            database will be left in a state in which each separate addition,
            replacement or deletion operation has either been fully performed or
            not performed at all: it is then up to the application to work out
            which operations need to be repeated.

            It's not valid to call commit() within a transaction.

            Beware of calling commit() too frequently: this will make indexing
            take much longer.

            Note that commit() need not be called explicitly: it will be called
            automatically when the database is closed, or when a sufficient number
            of modifications have been made. By default, this is every 10000
            documents added, deleted, or modified. This value is rather
            conservative, and if you have a machine with plenty of memory, you can
            improve indexing throughput dramatically by setting
            XAPIAN_FLUSH_THRESHOLD in the environment to a larger value.

            This method was new in Xapian 1.1.0 - in earlier versions it was
            called flush().

            Parameters:
            -----------

            Xapian::DatabaseError:  will be thrown if a problem occurs while
            modifying the database.

            Xapian::DatabaseCorruptError:  will be thrown if the database is in a
            corrupt state.
            """
            return _xapian.WritableDatabase_commit(self)

        def flush(self):
            """

            Pre-1.1.0 name for commit().

            void Xapian::WritableDatabase::flush()

            Use commit() instead.
            """
            return _xapian.WritableDatabase_flush(self)

        def begin_transaction(self, flushed=True):
            """

            Begin a transaction.

            void Xapian::WritableDatabase::begin_transaction(bool flushed=true)

            In Xapian a transaction is a group of modifications to the database
            which are linked such that either all will be applied simultaneously
            or none will be applied at all. Even in the case of a power failure,
            this characteristic should be preserved (as long as the filesystem
            isn't corrupted, etc).

            A transaction is started with begin_transaction() and can either be
            committed by calling commit_transaction() or aborted by calling
            cancel_transaction().

            By default, a transaction implicitly calls commit() before and after
            so that the modifications stand and fall without affecting
            modifications before or after.

            The downside of these implicit calls to commit() is that small
            transactions can harm indexing performance in the same way that
            explicitly calling commit() frequently can.

            If you're applying atomic groups of changes and only wish to ensure
            that each group is either applied or not applied, then you can prevent
            the automatic commit() before and after the transaction by starting
            the transaction with begin_transaction(false). However, if
            cancel_transaction is called (or if commit_transaction isn't called
            before the WritableDatabase object is destroyed) then any changes
            which were pending before the transaction began will also be
            discarded.

            Transactions aren't currently supported by the InMemory backend.

            Parameters:
            -----------

            flushed:  Is this a flushed transaction? By default transactions are
            "flushed", which means that committing a transaction will ensure
            those changes are permanently written to the database. By contrast,
            unflushed transactions only ensure that changes within the transaction
            are either all applied or all aren't.

            Parameters:
            -----------

            Xapian::UnimplementedError:  will be thrown if transactions are not
            available for this database type.

            Xapian::InvalidOperationError:  will be thrown if this is called at an
            invalid time, such as when a transaction is already in progress.
            """
            return _xapian.WritableDatabase_begin_transaction(self, flushed)

        def commit_transaction(self):
            """

            Complete the transaction currently in progress.

            void Xapian::WritableDatabase::commit_transaction()

            If this method completes successfully and this is a flushed
            transaction, all the database modifications made during the
            transaction will have been committed to the database.

            If an error occurs, an exception will be thrown, and none of the
            modifications made to the database during the transaction will have
            been applied to the database.

            In all cases the transaction will no longer be in progress.

            Parameters:
            -----------

            Xapian::DatabaseError:  will be thrown if a problem occurs while
            modifying the database.

            Xapian::DatabaseCorruptError:  will be thrown if the database is in a
            corrupt state.

            Xapian::InvalidOperationError:  will be thrown if a transaction is not
            currently in progress.

            Xapian::UnimplementedError:  will be thrown if transactions are not
            available for this database type.
            """
            return _xapian.WritableDatabase_commit_transaction(self)

        def cancel_transaction(self):
            """

            Abort the transaction currently in progress, discarding the pending
            modifications made to the database.

            void Xapian::WritableDatabase::cancel_transaction()

            If an error occurs in this method, an exception will be thrown, but
            the transaction will be cancelled anyway.

            Parameters:
            -----------

            Xapian::DatabaseError:  will be thrown if a problem occurs while
            modifying the database.

            Xapian::DatabaseCorruptError:  will be thrown if the database is in a
            corrupt state.

            Xapian::InvalidOperationError:  will be thrown if a transaction is not
            currently in progress.

            Xapian::UnimplementedError:  will be thrown if transactions are not
            available for this database type.
            """
            return _xapian.WritableDatabase_cancel_transaction(self)

        def add_document(self, document):
            """

            Add a new document to the database.

            Xapian::docid Xapian::WritableDatabase::add_document(const
            Xapian::Document &document)

            This method adds the specified document to the database, returning a
            newly allocated document ID. Automatically allocated document IDs come
            from a per-database monotonically increasing counter, so IDs from
            deleted documents won't be reused.

            If you want to specify the document ID to be used, you should call
            replace_document() instead.

            Note that changes to the database won't be immediately committed to
            disk; see commit() for more details.

            As with all database modification operations, the effect is atomic:
            the document will either be fully added, or the document fails to be
            added and an exception is thrown (possibly at a later time when
            commit() is called or the database is closed).

            Parameters:
            -----------

            document:  The new document to be added.

            The document ID of the newly added document.

            Parameters:
            -----------

            Xapian::DatabaseError:  will be thrown if a problem occurs while
            writing to the database.

            Xapian::DatabaseCorruptError:  will be thrown if the database is in a
            corrupt state.
            """
            return _xapian.WritableDatabase_add_document(self, document)

        def delete_document(self, *args):
            """

            Delete any documents indexed by a term from the database.

            void Xapian::WritableDatabase::delete_document(const std::string
            &unique_term)

            This method removes any documents indexed by the specified term from
            the database.

            A major use is for convenience when UIDs from another system are
            mapped to terms in Xapian, although this method has other uses (for
            example, you could add a "deletion date" term to documents at index
            time and use this method to delete all documents due for deletion on a
            particular date).

            Parameters:
            -----------

            unique_term:  The term to remove references to.

            Parameters:
            -----------

            Xapian::DatabaseError:  will be thrown if a problem occurs while
            writing to the database.

            Xapian::DatabaseCorruptError:  will be thrown if the database is in a
            corrupt state.
            """
            return _xapian.WritableDatabase_delete_document(self, *args)

        def replace_document(self, *args):
            """

            Replace any documents matching a term.

            Xapian::docid Xapian::WritableDatabase::replace_document(const
            std::string &unique_term, const Xapian::Document &document)

            This method replaces any documents indexed by the specified term with
            the specified document. If any documents are indexed by the term, the
            lowest document ID will be used for the document, otherwise a new
            document ID will be generated as for add_document.

            One common use is to allow UIDs from another system to easily be
            mapped to terms in Xapian. Note that this method doesn't automatically
            add unique_term as a term, so you'll need to call
            document.add_term(unique_term) first when using replace_document() in
            this way.

            Note that changes to the database won't be immediately committed to
            disk; see commit() for more details.

            As with all database modification operations, the effect is atomic:
            the document(s) will either be fully replaced, or the document(s) fail
            to be replaced and an exception is thrown (possibly at a later time
            when commit() is called or the database is closed).

            Parameters:
            -----------

            unique_term:  The "unique" term.

            document:  The new document.

            The document ID that document was given.

            Parameters:
            -----------

            Xapian::DatabaseError:  will be thrown if a problem occurs while
            writing to the database.

            Xapian::DatabaseCorruptError:  will be thrown if the database is in a
            corrupt state.
            """
            return _xapian.WritableDatabase_replace_document(self, *args)

        def add_spelling(self, word, freqinc=1):
            """

            Add a word to the spelling dictionary.

            void Xapian::WritableDatabase::add_spelling(const std::string &word,
            Xapian::termcount freqinc=1) const

            If the word is already present, its frequency is increased.

            Parameters:
            -----------

            word:  The word to add.

            freqinc:  How much to increase its frequency by (default 1).
            """
            return _xapian.WritableDatabase_add_spelling(self, word, freqinc)

        def remove_spelling(self, word, freqdec=1):
            """

            Remove a word from the spelling dictionary.

            void Xapian::WritableDatabase::remove_spelling(const std::string
            &word, Xapian::termcount freqdec=1) const

            The word's frequency is decreased, and if would become zero or less
            then the word is removed completely.

            Parameters:
            -----------

            word:  The word to remove.

            freqdec:  How much to decrease its frequency by (default 1).
            """
            return _xapian.WritableDatabase_remove_spelling(self, word, freqdec)

        def add_synonym(self, term, synonym):
            """

            Add a synonym for a term.

            void Xapian::WritableDatabase::add_synonym(const std::string &term,
            const std::string &synonym) const

            Parameters:
            -----------

            term:  The term to add a synonym for.

            synonym:  The synonym to add. If this is already a synonym for term,
            then no action is taken.
            """
            return _xapian.WritableDatabase_add_synonym(self, term, synonym)

        def remove_synonym(self, term, synonym):
            """

            Remove a synonym for a term.

            void Xapian::WritableDatabase::remove_synonym(const std::string &term,
            const std::string &synonym) const

            Parameters:
            -----------

            term:  The term to remove a synonym for.

            synonym:  The synonym to remove. If this isn't currently a synonym for
            term, then no action is taken.
            """
            return _xapian.WritableDatabase_remove_synonym(self, term, synonym)

        def clear_synonyms(self, term):
            """

            Remove all synonyms for a term.

            void Xapian::WritableDatabase::clear_synonyms(const std::string &term)
            const

            Parameters:
            -----------

            term:  The term to remove all synonyms for. If the term has no
            synonyms, no action is taken.
            """
            return _xapian.WritableDatabase_clear_synonyms(self, term)

        def set_metadata(self, key, metadata):
            """

            Set the user-specified metadata associated with a given key.

            void Xapian::WritableDatabase::set_metadata(const std::string &key,
            const std::string &metadata)

            This method sets the metadata value associated with a given key. If
            there is already a metadata value stored in the database with the same
            key, the old value is replaced. If you want to delete an existing item
            of metadata, just set its value to the empty string.

            User-specified metadata allows you to store arbitrary information in
            the form of (key, value) pairs.

            There's no hard limit on the number of metadata items, or the size of
            the metadata values. Metadata keys have a limited length, which depend
            on the backend. We recommend limiting them to 200 bytes. Empty keys
            are not valid, and specifying one will cause an exception.

            Metadata modifications are committed to disk in the same way as
            modifications to the documents in the database are: i.e.,
            modifications are atomic, and won't be committed to disk immediately
            (see commit() for more details). This allows metadata to be used to
            link databases with versioned external resources by storing the
            appropriate version number in a metadata item.

            You can also use the metadata to store arbitrary extra information
            associated with terms, documents, or postings by encoding the termname
            and/or document id into the metadata key.

            Parameters:
            -----------

            key:  The key of the metadata item to set.

            metadata:  The value of the metadata item to set.

            Parameters:
            -----------

            Xapian::DatabaseError:  will be thrown if a problem occurs while
            writing to the database.

            Xapian::DatabaseCorruptError:  will be thrown if the database is in a
            corrupt state.

            Xapian::InvalidArgumentError:  will be thrown if the key supplied is
            empty.

            Xapian::UnimplementedError:  will be thrown if the database backend in
            use doesn't support user- specified metadata.
            """
            return _xapian.WritableDatabase_set_metadata(self, key, metadata)

    WritableDatabase.commit = new_instancemethod(_xapian.WritableDatabase_commit, None, WritableDatabase)
    WritableDatabase.flush = new_instancemethod(_xapian.WritableDatabase_flush, None, WritableDatabase)
    WritableDatabase.begin_transaction = new_instancemethod(_xapian.WritableDatabase_begin_transaction, None, WritableDatabase)
    WritableDatabase.commit_transaction = new_instancemethod(_xapian.WritableDatabase_commit_transaction, None, WritableDatabase)
    WritableDatabase.cancel_transaction = new_instancemethod(_xapian.WritableDatabase_cancel_transaction, None, WritableDatabase)
    WritableDatabase.add_document = new_instancemethod(_xapian.WritableDatabase_add_document, None, WritableDatabase)
    WritableDatabase.delete_document = new_instancemethod(_xapian.WritableDatabase_delete_document, None, WritableDatabase)
    WritableDatabase.replace_document = new_instancemethod(_xapian.WritableDatabase_replace_document, None, WritableDatabase)
    WritableDatabase.add_spelling = new_instancemethod(_xapian.WritableDatabase_add_spelling, None, WritableDatabase)
    WritableDatabase.remove_spelling = new_instancemethod(_xapian.WritableDatabase_remove_spelling, None, WritableDatabase)
    WritableDatabase.add_synonym = new_instancemethod(_xapian.WritableDatabase_add_synonym, None, WritableDatabase)
    WritableDatabase.remove_synonym = new_instancemethod(_xapian.WritableDatabase_remove_synonym, None, WritableDatabase)
    WritableDatabase.clear_synonyms = new_instancemethod(_xapian.WritableDatabase_clear_synonyms, None, WritableDatabase)
    WritableDatabase.set_metadata = new_instancemethod(_xapian.WritableDatabase_set_metadata, None, WritableDatabase)
    WritableDatabase_swigregister = _xapian.WritableDatabase_swigregister
    WritableDatabase_swigregister(WritableDatabase)

    def open_stub(*args):
        """

        Construct a WritableDatabase object for a stub database file.

        WritableDatabase Xapian::Auto::open_stub(const std::string &file, int
        action)

        The stub database file must contain serialised parameters for exactly
        one database.

        Parameters:
        -----------

        file:  pathname of the stub database file.

        action:  determines handling of existing/non-existing database:
        Xapian::DB_CREATE fail if database already exist, otherwise create new
        database.

        Xapian::DB_CREATE_OR_OPEN open existing database, or create new
        database if none exists.

        Xapian::DB_CREATE_OR_OVERWRITE overwrite existing database, or create
        new database if none exists.

        Xapian::DB_OPEN open existing database, failing if none exists.
        """
        return _xapian.open_stub(*args)

    def inmemory_open():
        """

        Construct a WritableDatabase object for a new, empty InMemory
        database.

        WritableDatabase Xapian::InMemory::open()

        Only a writable InMemory database can be created, since a read-only
        one would always remain empty.
        """
        return _xapian.inmemory_open()

    def chert_open(*args):
        """

        Construct a Database object for update access to a Chert database.

        WritableDatabase Xapian::Chert::open(const std::string &dir, int
        action, int block_size=0)

        Parameters:
        -----------

        dir:  pathname of the directory containing the database.

        action:  determines handling of existing/non-existing database:
        Xapian::DB_CREATE fail if database already exist, otherwise create new
        database.

        Xapian::DB_CREATE_OR_OPEN open existing database, or create new
        database if none exists.

        Xapian::DB_CREATE_OR_OVERWRITE overwrite existing database, or create
        new database if none exists.

        Xapian::DB_OPEN open existing database, failing if none exists.

        block_size:  the Btree blocksize to use (in bytes), which must be a
        power of two between 2048 and 65536 (inclusive). The default (also
        used if an invalid value if passed) is 8192 bytes. This parameter is
        ignored when opening an existing database.
        """
        return _xapian.chert_open(*args)

    def remote_open(*args):
        """

        Construct a Database object for read-only access to a remote database
        accessed via a program.

        Database Xapian::Remote::open(const std::string &program, const
        std::string &args, useconds_t timeout=10000)

        Access to the remote database is done by running an external program
        and communicating with it on stdin/stdout.

        Parameters:
        -----------

        program:  the external program to run.

        args:  space-separated list of arguments to pass to program.

        timeout:  timeout in milliseconds. If this timeout is exceeded for any
        individual operation on the remote database then
        Xapian::NetworkTimeoutError is thrown. A timeout of 0 means don't
        timeout. (Default is 10000ms, which is 10 seconds).
        """
        return _xapian.remote_open(*args)

    def remote_open_writable(*args):
        """

        Construct a WritableDatabase object for update access to a remote
        database accessed via a program.

        WritableDatabase Xapian::Remote::open_writable(const std::string
        &program, const std::string &args, useconds_t timeout=0, int flags=0)

        Access to the remote database is done by running an external program
        and communicating with it on stdin/stdout.

        Parameters:
        -----------

        program:  the external program to run.

        args:  space-separated list of arguments to pass to program.

        timeout:  timeout in milliseconds. If this timeout is exceeded for any
        individual operation on the remote database then
        Xapian::NetworkTimeoutError is thrown. (Default is 0, which means
        don't timeout).

        flags:   Xapian::DB_RETRY_LOCK or 0.
        """
        return _xapian.remote_open_writable(*args)

    # Set the documentation format - this is used by tools like "epydoc" to decide
    # how to format the documentation strings.
    __docformat__ = "restructuredtext en"

    ##################################
    # Support for iteration of MSets #
    ##################################

    class MSetItem(object):
        """An item returned from iteration of the MSet.

        The item supports access to the following attributes and properties:

         - `docid`: The Xapian document ID corresponding to this MSet item.
         - `weight`: The weight corresponding to this MSet item.
         - `rank`: The rank of this MSet item.  The rank is the position in the
           total set of matching documents of this item.  The highest document is
           given a rank of 0.  If the MSet did not start at the highest matching
           document, because a non-zero 'start' parameter was supplied to
           get_mset(), the first document in the MSet will have a rank greater than
           0 (in fact, it will be equal to the value of 'start' supplied to
           get_mset()).
         - `percent`: The percentage score assigned to this MSet item.
         - `document`: The document for this MSet item.  This can be used to access
           the document data, or any other information stored in the document (such
           as term lists).  It is lazily evaluated.
         - `collapse_key`: The value of the key which was used for collapsing.
         - `collapse_count`: An estimate of the number of documents that have been
           collapsed into this one.

        The collapse count estimate will always be less than or equal to the actual
        number of other documents satisfying the match criteria with the same
        collapse key as this document.  If may be 0 even though there are other
        documents with the same collapse key which satisfying the match criteria.
        However if this method returns non-zero, there definitely are other such
        documents.  So this method may be used to inform the user that there are
        "at least N other matches in this group", or to control whether to offer a
        "show other documents in this group" feature (but note that it may not
        offer it in every case where it would show other documents).

        """

        __slots__ = ('_mset', '_firstitem', 'docid', 'weight', 'rank',
                     'percent', 'collapse_key', 'collapse_count', '_document', )

        def __init__(self, iter, mset):
            self._mset = mset
            self._firstitem = self._mset.get_firstitem()
            self.docid = iter.get_docid()
            self.weight = iter.get_weight()
            self.rank = iter.get_rank()
            self.percent = iter.get_percent()
            self.collapse_key = iter.get_collapse_key()
            self.collapse_count = iter.get_collapse_count()
            self._document = None

        def _get_document(self):
            if self._document is None:
                self._document = self._mset._get_hit_internal(self.rank - self._firstitem).get_document()
            return self._document

        document = property(_get_document, doc="The document object corresponding to this MSet item.")

    class MSetIter(object):
        """An iterator over the items in an MSet.

        The iterator will return MSetItem objects, which will be evaluated lazily
        where appropriate.

        """
        __slots__ = ('_iter', '_end', '_mset')
        def __init__(self, mset):
            self._iter = mset._begin()
            self._end = mset._end()
            self._mset = mset

        def __iter__(self):
            return self

        def next(self):
            if self._iter == self._end:
                raise StopIteration
            else:
                r = MSetItem(self._iter, self._mset)
                self._iter.next()
                return r

    # Modify the MSet to allow access to the python iterators, and have other
    # convenience methods.

    def _mset_gen_iter(self):
        """Return an iterator over the MSet.

        The iterator will return MSetItem objects, which will be evaluated lazily
        where appropriate.

        """
        return MSetIter(self)
    MSet.__iter__ = _mset_gen_iter

    MSet.__len__ = lambda self: MSet.size(self)

    def _mset_getitem(self, index):
        """Get an item from the MSet.

        The supplied index is relative to the start of the MSet, not the absolute
        rank of the item.

        Returns an MSetItem.

        """
        if index < 0:
            index += len(self)
        if index < 0 or index >= len(self):
            raise IndexError("Mset index out of range")
        return MSetItem(self._get_hit_internal(index), self)
    MSet.__getitem__ = _mset_getitem
    MSet.get_hit = _mset_getitem

    ##################################
    # Support for iteration of ESets #
    ##################################

    class ESetItem(object):
        """An item returned from iteration of the ESet.

        The item supports access to the following attributes:

         - `term`: The term corresponding to this ESet item.
         - `weight`: The weight corresponding to this ESet item.

        """
        __slots__ = ('term', 'weight')

        def __init__(self, iter):
            self.term = iter.get_term()
            self.weight = iter.get_weight()

    class ESetIter(object):
        """An iterator over the items in an ESet.

        The iterator will return ESetItem objects.

        """
        __slots__ = ('_iter', '_end')
        def __init__(self, eset):
            self._iter = eset._begin()
            self._end = eset._end()

        def __iter__(self):
            return self

        def next(self):
            if self._iter == self._end:
                raise StopIteration
            else:
                r = ESetItem(self._iter)
                self._iter.next()
                return r

    # Modify the ESet to allow access to the python iterators, and have other
    # convenience methods.

    def _eset_gen_iter(self):
        """Return an iterator over the ESet.

        The iterator will return ESetItem objects.

        """
        return ESetIter(self)
    ESet.__iter__ = _eset_gen_iter

    ESet.__len__ = lambda self: ESet.size(self)

    #######################################
    # Support for iteration of term lists #
    #######################################

    class TermListItem(object):
        """An item returned from iteration of a term list.

        The item supports access to the following attributes and properties:

         - `term`: The term corresponding to this TermListItem.
         - `wdf`: The within document frequency of this term.
         - `termfreq`: The number of documents in the collection which are indexed
           by the term
         - `positer`: An iterator over the positions which the term appears at in
           the document.  This is only available until the iterator which returned
           this item next moves.

        """
        __slots__ = ('_iter', 'term', '_wdf', '_termfreq')

        def __init__(self, iter, term):
            self._iter = iter
            self.term = term
            self._wdf = None
            self._termfreq = None

            if iter._has_wdf == TermIter.EAGER:
                self._wdf = iter._iter.get_wdf()
            if iter._has_termfreq == TermIter.EAGER:
                self._termfreq = iter._iter.get_termfreq()

    # Support for sequence API
            sequence = ['term', 'wdf', 'termfreq', 'positer']
            if iter._has_wdf == TermIter.INVALID:
                sequence[1] = 0
            if iter._has_termfreq == TermIter.INVALID:
                sequence[2] = 0
            if iter._has_positions == TermIter.INVALID:
                sequence[3] = PositionIter()

        def _get_wdf(self):
            """Get the within-document-frequency of the current term.

            This will raise a InvalidOperationError exception if the iterator this
            item came from doesn't support within-document-frequencies.

            """
            if self._wdf is None:
                if self._iter._has_wdf == TermIter.INVALID:
                    raise InvalidOperationError("Iterator does not support wdfs")
                if self.term is not self._iter._lastterm:
                    raise InvalidOperationError("Iterator has moved, and does not support random access")
                self._wdf = self._iter._iter.get_wdf()
            return self._wdf
        wdf = property(_get_wdf, doc=
        """The within-document-frequency of the current term (if meaningful).

        This will raise a InvalidOperationError exception if the iterator
        this item came from doesn't support within-document-frequencies.

        """)

        def _get_termfreq(self):
            """Get the term frequency.

            This is the number of documents in the collection which are indexed by
            the term.

            This will raise a InvalidOperationError exception if the iterator this
            item came from doesn't support term frequencies.

            """
            if self._termfreq is None:
                if self._iter._has_termfreq == TermIter.INVALID:
                    raise InvalidOperationError("Iterator does not support term frequencies")
                if self.term is not self._iter._lastterm:
                    raise InvalidOperationError("Iterator has moved, and does not support random access")
                self._termfreq = self._iter._iter.get_termfreq()
            return self._termfreq
        termfreq = property(_get_termfreq, doc=
        """The term frequency of the current term (if meaningful).

        This is the number of documents in the collection which are indexed by the
        term.

        This will raise a InvalidOperationError exception if the iterator
        this item came from doesn't support term frequencies.

        """)

        def _get_positer(self):
            """Get a position list iterator.

            The iterator will return integers representing the positions that the
            term occurs at.

            This will raise a InvalidOperationError exception if the iterator this
            item came from doesn't support position lists, or if the iterator has
            moved on since the item was returned from it.

            """
            if self._iter._has_positions == TermIter.INVALID:
                raise InvalidOperationError("Iterator does not support position lists")
    # Access to position lists is always lazy, so we don't need to check
    # _has_positions.
            if self.term is not self._iter._lastterm:
                raise InvalidOperationError("Iterator has moved, and does not support random access")
            return PositionIter(self._iter._iter._positionlist_begin(),
                                self._iter._iter._positionlist_end())
        positer = property(_get_positer, doc=
        """A position iterator for the current term (if meaningful).

        The iterator will return integers representing the positions that the term
        occurs at.

        This will raise a InvalidOperationError exception if the iterator this item
        came from doesn't support position lists, or if the iterator has moved on
        since the item was returned from it.

        """)

    class TermIter(object):
        """An iterator over a term list.

        The iterator will return TermListItem objects, which will be evaluated
        lazily where appropriate.

        """
        __slots__ = ('_iter', '_end', '_has_termfreq', '_has_wdf',
                     '_has_positions', '_return_strings', '_lastterm', '_moved')

        INVALID = 0
        LAZY = 1
        EAGER = 2

        def __init__(self, start, end, has_termfreq=INVALID,
                     has_wdf=INVALID, has_positions=INVALID,
                     return_strings=False):
            self._iter = start
            self._end = end
            self._has_termfreq = has_termfreq
            self._has_wdf = has_wdf
            self._has_positions = has_positions
            assert(has_positions != TermIter.EAGER) # Can't do eager access to position lists
            self._return_strings = return_strings
            self._lastterm = None # Used to test if the iterator has moved

    # _moved is True if we've moved onto the next item.  This is needed so
    # that the iterator doesn't have to move on until just before next() is
    # called: since the iterator starts by pointing at a valid item, we
    # can't just call self._iter.next() unconditionally at the start of our
    # next() method.
            self._moved = True

        def __iter__(self):
            return self

        def next(self):
            if not self._moved:
                self._iter.next()
                self._moved = True

            if self._iter == self._end:
                self._lastterm = None
                raise StopIteration
            else:
                self._lastterm = self._iter.get_term()
                self._moved = False
                if self._return_strings:
                    return self._lastterm
                return TermListItem(self, self._lastterm)

        def skip_to(self, term):
            """Skip the iterator forward.

            The iterator is advanced to the first term at or after the current
            position which is greater than or equal to the supplied term.

            If there are no such items, this will raise StopIteration.

            This returns the item which the iterator is moved to.  The subsequent
            item will be returned the next time that next() is called (unless
            skip_to() is called again first).

            """
            if self._iter != self._end:
                self._iter.skip_to(term)

            if self._iter == self._end:
                self._lastterm = None
                self._moved = True
                raise StopIteration

    # Update self._lastterm if the iterator has moved.
    # TermListItems compare a saved value of lastterm with self._lastterm
    # with the object identity comparator, so it is important to ensure
    # that it does not get modified if the new term compares equal.
            newterm = self._iter.get_term()
            if newterm != self._lastterm:
                self._lastterm = newterm

            self._moved = False
            if self._return_strings:
                return self._lastterm
            return TermListItem(self, self._lastterm)

    # Modify Enquire to add a "matching_terms()" method.
    def _enquire_gen_iter(self, which):
        """Get an iterator over the terms which match a given match set item.

        The match set item to consider is specified by the `which` parameter, which
        may be a document ID, or an MSetItem object.

        The iterator will return string objects.

        """
        if isinstance(which, MSetItem):
            which = which.docid
        return TermIter(self._get_matching_terms_begin(which),
                        self._get_matching_terms_end(which),
                        return_strings=True)
    Enquire.matching_terms = _enquire_gen_iter

    # Modify Query to add an "__iter__()" method.
    def _query_gen_iter(self):
        """Get an iterator over the terms in a query.

        The iterator will return string objects.

        """
        return TermIter(self._get_terms_begin(),
                        self._get_terms_end(),
                        return_strings=True)
    Query.__iter__ = _query_gen_iter

    # Modify Database to add an "__iter__()" method and an "allterms()" method.
    def _database_gen_allterms_iter(self, prefix=None):
        """Get an iterator over all the terms in the database.

        The iterator will return TermListItem objects, but these will not support
        access to wdf, or position information.

        Access to term frequency information is only available until the iterator
        has moved on.

        If prefix is supplied, only terms which start with that prefix will be
        returned.

        """
        if prefix is None:
            return TermIter(self._allterms_begin(), self._allterms_end(),
                            has_termfreq=TermIter.LAZY)
        else:
            return TermIter(self._allterms_begin(prefix), self._allterms_end(prefix),
                            has_termfreq=TermIter.LAZY)
    Database.__iter__ = _database_gen_allterms_iter
    Database.allterms = _database_gen_allterms_iter

    # Modify Database to add a "termlist()" method.
    def _database_gen_termlist_iter(self, docid):
        """Get an iterator over all the terms which index a given document ID.

        The iterator will return TermListItem objects.

        Access to term frequency and position information is only available until
        the iterator has moved on.

        """
    # Note: has_termfreq is set to LAZY because most databases don't store term
    # frequencies in the termlist (because this would require updating many termlist
    # entries for every document update), so access to the term frequency requires a
    # separate lookup.
        return TermIter(self._termlist_begin(docid), self._termlist_end(docid),
                        has_termfreq=TermIter.LAZY,
                        has_wdf=TermIter.EAGER,
                        has_positions=TermIter.LAZY)
    Database.termlist = _database_gen_termlist_iter

    # Modify Database to add a "spellings()" method.
    def _database_gen_spellings_iter(self):
        """Get an iterator which returns all the spelling correction targets

        The iterator will return TermListItem objects.  Only the term frequency is
        available; wdf and positions are not meaningful.

        """
        return TermIter(self._spellings_begin(), self._spellings_end(),
                        has_termfreq=TermIter.EAGER,
                        has_wdf=TermIter.INVALID,
                        has_positions=TermIter.INVALID)
    Database.spellings = _database_gen_spellings_iter

    # Modify Database to add a "synonyms()" method.
    def _database_gen_synonyms_iter(self, term):
        """Get an iterator which returns all the synonyms for a given term.

        The term to return synonyms for is specified by the `term` parameter.

        The iterator will return string objects.

        """
        return TermIter(self._synonyms_begin(term),
                        self._synonyms_end(term),
                        return_strings=True)
    Database.synonyms = _database_gen_synonyms_iter

    # Modify Database to add a "synonym_keys()" method.
    def _database_gen_synonym_keys_iter(self, prefix=""):
        """Get an iterator which returns all the terms which have synonyms.

        The iterator will return string objects.

        If `prefix` is non-empty, only terms with this prefix are returned.

        """
        return TermIter(self._synonym_keys_begin(prefix),
                        self._synonym_keys_end(prefix),
                        return_strings=True)
    Database.synonym_keys = _database_gen_synonym_keys_iter

    # Modify Database to add a "metadata_keys()" method, instead of direct access
    # to metadata_keys_begin and metadata_keys_end.
    def _database_gen_metadata_keys_iter(self, prefix=""):
        """Get an iterator which returns all the metadata keys.

        The iterator will return string objects.

        If `prefix` is non-empty, only metadata keys with this prefix are returned.

        """
        return TermIter(self._metadata_keys_begin(prefix),
                        self._metadata_keys_end(prefix),
                        return_strings=True)
    Database.metadata_keys = _database_gen_metadata_keys_iter

    # Modify Document to add an "__iter__()" method and a "termlist()" method.
    def _document_gen_termlist_iter(self):
        """Get an iterator over all the terms in a document.

        The iterator will return TermListItem objects.

        Access to term frequency and position information is only available until
        the iterator has moved on.

        Note that term frequency information is only meaningful for a document
        retrieved from a database.  If term frequency information is requested for
        a document which was freshly created, an InvalidOperationError will be
        raised.

        """
    # Note: document termlist iterators may be implemented entirely in-memory
    # (in which case access to all items could be allowed eagerly), but may
    # also be implemented by returning a database termlist (for documents which
    # are stored in a database, rather than freshly created).  We choose the
    # most conservative settings, to avoid doing eager access when lazy access
    # would be more appropriate.
        return TermIter(self._termlist_begin(), self._termlist_end(),
                        has_termfreq=TermIter.LAZY,
                        has_wdf=TermIter.EAGER,
                        has_positions=TermIter.LAZY)
    Document.__iter__ = _document_gen_termlist_iter
    Document.termlist = _document_gen_termlist_iter

    # Modify QueryParser to add a "stoplist()" method.
    def _queryparser_gen_stoplist_iter(self):
        """Get an iterator over all the stopped terms from the previous query.

        This returns an iterator over all the terms which were omitted from the
        previously parsed query due to being considered to be stopwords.  Each
        instance of a word omitted from the query is represented in the returned
        list, in the order in which the

        The iterator will return string objects.

        """
        return TermIter(self._stoplist_begin(), self._stoplist_end(),
                        return_strings=True)
    QueryParser.stoplist = _queryparser_gen_stoplist_iter

    # Modify QueryParser to add an "unstemlist()" method.
    def _queryparser_gen_unstemlist_iter(self, tname):
        """Get an iterator over all the unstemmed forms of a stemmed term.

        This returns an iterator which returns all the unstemmed words which were
        stemmed to the stemmed form specified by `tname` when parsing the previous
        query.  Each instance of a word which stems to `tname` is returned by the
        iterator in the order in which the words appeared in the query - an
        individual unstemmed word may thus occur multiple times.

        The iterator will return string objects.

        """
        return TermIter(self._unstem_begin(tname), self._unstem_end(tname),
                        return_strings=True)
    QueryParser.unstemlist = _queryparser_gen_unstemlist_iter

    # Modify ValueCountMatchSpy to add an "values()" method.
    def wrapper():
        begin = ValueCountMatchSpy.values_begin
        del ValueCountMatchSpy.values_begin
        end = ValueCountMatchSpy.values_end
        del ValueCountMatchSpy.values_end
        def values(self):
            """Get an iterator over all the values in the slot.

            Values will be returned in ascending alphabetical order.

            The iterator will return TermListItem objects: the value can be
            accessed as the `term` property, and the frequency can be accessed as
            the `termfreq` property.

            """
            return TermIter(begin(self), end(self), has_termfreq=TermIter.EAGER)
        return values
    ValueCountMatchSpy.values = wrapper()
    del wrapper

    # Modify ValueCountMatchSpy to add an "top_values()" method.
    def wrapper():
        begin = ValueCountMatchSpy.top_values_begin
        del ValueCountMatchSpy.top_values_begin
        end = ValueCountMatchSpy.top_values_end
        del ValueCountMatchSpy.top_values_end
        def top_values(self, maxvalues):
            """Get an iterator over the most frequent values for the slot.

            Values will be returned in descending order of frequency.  Values with
            the same frequency will be returned in ascending alphabetical order.

            The iterator will return TermListItem objects: the value can be
            accessed as the `term` property, and the frequency can be accessed as
            the `termfreq` property.

            """
            return TermIter(begin(self, maxvalues), end(self, maxvalues),
                            has_termfreq=TermIter.EAGER)
        return top_values
    ValueCountMatchSpy.top_values = wrapper()
    del wrapper

    # When we make a query, keep a note of postingsources involved, so they won't
    # be deleted. This hack can probably be removed once xapian bug #186 is fixed.
    __query_init_orig = Query.__init__
    def _query_init(self, *args):
        """Make a new query object.

        Many possible arguments are possible - see the documentation for details.

        """
        ps = []
        if len(args) == 1 and isinstance(args[0], PostingSource):
            ps.append(args[0])
        else:
            for arg in args:
                if isinstance(arg, Query):
                    ps.extend(getattr(arg, '_ps', []))
                elif hasattr(arg, '__iter__'):
                    for listarg in arg:
                        if isinstance(listarg, Query):
                            ps.extend(getattr(listarg, '_ps', []))
        __query_init_orig(self, *args)
        self._ps = ps
    Query.__init__ = _query_init
    del _query_init

    # When setting a query on enquire, keep a note of postingsources involved, so
    # they won't be deleted. This hack can probably be removed once xapian bug #186
    # is fixed.
    __enquire_set_query_orig = Enquire.set_query
    def _enquire_set_query(self, query, qlen=0):
        self._ps = getattr(query, '_ps', [])
        return __enquire_set_query_orig(self, query, qlen)
    _enquire_set_query.__doc__ = __enquire_set_query_orig.__doc__
    Enquire.set_query = _enquire_set_query
    del _enquire_set_query

    # When getting  a query from enquire, keep a note of postingsources involved,
    # so they won't be deleted. This hack can probably be removed once xapian bug
    # #186 is fixed.
    __enquire_get_query_orig = Enquire.get_query
    def _enquire_get_query(self):
        query = __enquire_get_query_orig(self)
        query._ps = getattr(self, '_ps', [])
        return query
    _enquire_get_query.__doc__ = __enquire_get_query_orig.__doc__
    Enquire.get_query = _enquire_get_query
    del _enquire_get_query

    # When we set a ValueRangeProcessor into the QueryParser, keep a python
    # reference so it won't be deleted. This hack can probably be removed once
    # xapian bug #186 is fixed.
    __queryparser_add_valuerangeprocessor_orig = QueryParser.add_valuerangeprocessor
    def _queryparser_add_valuerangeprocessor(self, vrproc):
        if not hasattr(self, '_vrps'):
            self._vrps = []
        self._vrps.append(vrproc)
        return __queryparser_add_valuerangeprocessor_orig(self, vrproc)
    _queryparser_add_valuerangeprocessor.__doc__ = __queryparser_add_valuerangeprocessor_orig.__doc__
    QueryParser.add_valuerangeprocessor = _queryparser_add_valuerangeprocessor
    del _queryparser_add_valuerangeprocessor

    # When we set a RangeProcessor into the QueryParser, keep a python
    # reference so it won't be deleted. This hack can probably be removed once
    # xapian bug #186 is fixed.
    __queryparser_add_rangeprocessor_orig = QueryParser.add_rangeprocessor
    def _queryparser_add_rangeprocessor(self, rproc):
        if not hasattr(self, '_rps'):
            self._rps = []
        self._rps.append(rproc)
        return __queryparser_add_rangeprocessor_orig(self, rproc)
    _queryparser_add_rangeprocessor.__doc__ = __queryparser_add_rangeprocessor_orig.__doc__
    QueryParser.add_rangeprocessor = _queryparser_add_rangeprocessor
    del _queryparser_add_rangeprocessor

    # When we set a FieldProcessor into the QueryParser, keep a python
    # reference so it won't be deleted. This hack can probably be removed once
    # xapian bug #186 is fixed.
    __queryparser_add_prefix_orig = QueryParser.add_prefix
    def _queryparser_add_prefix(self, s, proc):
        if not isinstance(proc, (str, bytes)):
            if not hasattr(self, '_fps'):
                self._fps = []
            self._fps.append(proc)
        return __queryparser_add_prefix_orig(self, s, proc)
    _queryparser_add_prefix.__doc__ = __queryparser_add_prefix_orig.__doc__
    QueryParser.add_prefix = _queryparser_add_prefix
    del _queryparser_add_prefix
    __queryparser_add_boolean_prefix_orig = QueryParser.add_boolean_prefix
    def _queryparser_add_boolean_prefix(self, s, proc, exclusive = True):
        if not isinstance(proc, (str, bytes)):
            if not hasattr(self, '_fps'):
                self._fps = []
            self._fps.append(proc)
        return __queryparser_add_boolean_prefix_orig(self, s, proc, exclusive)
    _queryparser_add_boolean_prefix.__doc__ = __queryparser_add_boolean_prefix_orig.__doc__
    QueryParser.add_boolean_prefix = _queryparser_add_boolean_prefix
    del _queryparser_add_boolean_prefix

    # When we set a Stopper into the QueryParser, keep a python reference so it
    # won't be deleted. This hack can probably be removed once xapian bug #186 is
    # fixed.
    __queryparser_set_stopper_orig = QueryParser.set_stopper
    def _queryparser_set_stopper(self, stopper):
        self._stopper = stopper
        return __queryparser_set_stopper_orig(self, stopper)
    _queryparser_set_stopper.__doc__ = __queryparser_set_stopper_orig.__doc__
    QueryParser.set_stopper = _queryparser_set_stopper
    del _queryparser_set_stopper

    # When we set a Stopper into the TermGenerator, keep a python reference so it
    # won't be deleted. This hack can probably be removed once xapian bug #186 is
    # fixed.
    __termgenerator_set_stopper_orig = TermGenerator.set_stopper
    def _termgenerator_set_stopper(self, stopper):
        self._stopper = stopper
        return __termgenerator_set_stopper_orig(self, stopper)
    _termgenerator_set_stopper.__doc__ = __termgenerator_set_stopper_orig.__doc__
    TermGenerator.set_stopper = _termgenerator_set_stopper
    del _termgenerator_set_stopper

    # When we set a Sorter on enquire, keep a python reference so it won't be
    # deleted.  This hack can probably be removed once xapian bug #186 is fixed.
    __enquire_set_sort_by_key_orig = Enquire.set_sort_by_key
    def _enquire_set_sort_by_key(self, sorter, reverse):
        self._sorter = sorter
        return __enquire_set_sort_by_key_orig(self, sorter, reverse)
    _enquire_set_sort_by_key.__doc__ = __enquire_set_sort_by_key_orig.__doc__
    Enquire.set_sort_by_key = _enquire_set_sort_by_key
    del _enquire_set_sort_by_key

    __enquire_set_sort_by_key_then_relevance_orig = Enquire.set_sort_by_key_then_relevance
    def _enquire_set_sort_by_key_then_relevance(self, sorter, reverse):
        self._sorter = sorter
        return __enquire_set_sort_by_key_then_relevance_orig(self, sorter, reverse)
    _enquire_set_sort_by_key_then_relevance.__doc__ = __enquire_set_sort_by_key_then_relevance_orig.__doc__
    Enquire.set_sort_by_key_then_relevance = _enquire_set_sort_by_key_then_relevance
    del _enquire_set_sort_by_key_then_relevance

    __enquire_set_sort_by_relevance_then_key_orig = Enquire.set_sort_by_relevance_then_key
    def _enquire_set_sort_by_relevance_then_key(self, sorter, reverse):
        self._sorter = sorter
        return __enquire_set_sort_by_relevance_then_key_orig(self, sorter, reverse)
    _enquire_set_sort_by_relevance_then_key.__doc__ = __enquire_set_sort_by_relevance_then_key_orig.__doc__
    Enquire.set_sort_by_relevance_then_key = _enquire_set_sort_by_relevance_then_key
    del _enquire_set_sort_by_relevance_then_key

    ##########################################
    # Support for iteration of posting lists #
    ##########################################

    class PostingItem(object):
        """An item returned from iteration of a posting list.

        The item supports access to the following attributes and properties:

         - `docid`: The document ID corresponding to this PostingItem.
         - `doclength`: The length of the document corresponding to this
           PostingItem.
         - `wdf`: The within document frequency of the term which the posting list
           is for in the document corresponding to this PostingItem.
         - `positer`: An iterator over the positions which the term corresponing to
           this posting list occurs at in the document corresponding to this
           PostingItem.  This is only available until the iterator which returned
           this item next moves.

        """
        __slots__ = ('_iter', 'docid', 'doclength', 'wdf',)

        def __init__(self, iter):
            self._iter = iter
            self.docid = iter._iter.get_docid()
            self.doclength = iter._iter.get_doclength()
            self.wdf = iter._iter.get_wdf()

    # Support for sequence API
            sequence = ['docid', 'doclength', 'wdf', 'positer']
            if not iter._has_positions:
                sequence[3] = PositionIter()

        def _get_positer(self):
            """Get a position list iterator.

            The iterator will return integers representing the positions that the
            term occurs at in the document corresponding to this PostingItem.

            This will raise a InvalidOperationError exception if the iterator this
            item came from doesn't support position lists, or if the iterator has
            moved on since the item was returned from it.

            """
            if not self._iter._has_positions:
                raise InvalidOperationError("Iterator does not support position lists")
            if self._iter._iter == self._iter._end or \
               self.docid != self._iter._iter.get_docid():
                raise InvalidOperationError("Iterator has moved, and does not support random access")
            return PositionIter(self._iter._iter._positionlist_begin(),
                                self._iter._iter._positionlist_end())
        positer = property(_get_positer, doc=
        """A position iterator for the current posting (if meaningful).

        The iterator will return integers representing the positions that the term
        occurs at.

        This will raise a InvalidOperationError exception if the iterator this item
        came from doesn't support position lists, or if the iterator has moved on
        since the item was returned from it.

        """)

    class PostingIter(object):
        """An iterator over a posting list.

        The iterator will return PostingItem objects, which will be evaluated
        lazily where appropriate.

        """
        __slots__ = ('_iter', '_end', '_has_positions', '_moved')

        def __init__(self, start, end, has_positions=False):
            self._iter = start
            self._end = end
            self._has_positions = has_positions

    # _moved is True if we've moved onto the next item.  This is needed so
    # that the iterator doesn't have to move on until just before next() is
    # called: since the iterator starts by pointing at a valid item, we
    # can't just call self._iter.next() unconditionally at the start of our
    # next() method.
            self._moved = True

        def __iter__(self):
            return self

        def next(self):
            if not self._moved:
                self._iter.next()
                self._moved = True

            if self._iter == self._end:
                raise StopIteration
            else:
                self._moved = False
                return PostingItem(self)

        def skip_to(self, docid):
            """Skip the iterator forward.

            The iterator is advanced to the first document with a document ID
            which is greater than or equal to the supplied document ID.

            If there are no such items, this will raise StopIteration.

            This returns the item which the iterator is moved to.  The subsequent
            item will be returned the next time that next() is called (unless
            skip_to() is called again first).

            """
            if self._iter != self._end:
                self._iter.skip_to(docid)
            if self._iter == self._end:
                self._moved = True
                raise StopIteration
            self._moved = False
            return PostingItem(self)

    def _database_gen_postlist_iter(self, tname):
        """Get an iterator over the postings which are indexed by a given term.

        If `tname` is empty, an iterator over all the documents will be returned
        (this will contain one entry for each document, will always return a wdf of
        1, and will not allow access to a position iterator).

        """
        if len(tname) != 0:
            return PostingIter(self._postlist_begin(tname), self._postlist_end(tname),
                               has_positions=True)
        else:
            return PostingIter(self._postlist_begin(tname), self._postlist_end(tname))
    Database.postlist = _database_gen_postlist_iter

    ###########################################
    # Support for iteration of position lists #
    ###########################################

    class PositionIter(object):
        """An iterator over a position list.

        The iterator will return integers, in ascending order.

        """
        def __init__(self, start = 0, end = 0):
            self.iter = start
            self.end = end

        def __iter__(self):
            return self

        def next(self):
            if self.iter==self.end:
                raise StopIteration
            else:
                r = self.iter.get_termpos()
                self.iter.next()
                return r

    # Modify Database to add a "positionlist()" method.
    def _database_gen_positionlist_iter(self, docid, tname):
        """Get an iterator over all the positions in a given document of a term.

        The iterator will return integers, in ascending order.

        """
        return PositionIter(self._positionlist_begin(docid, tname), self._positionlist_end(docid, tname))
    Database.positionlist = _database_gen_positionlist_iter

    ########################################
    # Support for iteration of value lists #
    ########################################

    class ValueItem(object):
        """An item returned from iteration of the values in a document.

        The item supports access to the following attributes:

         - `num`: The number of the value.
         - `value`: The contents of the value.

        """

        __slots__ = ('num', 'value', )

        def __init__(self, num, value):
            self.num = num
            self.value = value

    class ValueIter(object):
        """An iterator over all the values stored in a document.

        The iterator will return ValueItem objects, in ascending order of value number.

        """
        def __init__(self, start, end):
            self.iter = start
            self.end = end

        def __iter__(self):
            return self

        def next(self):
            if self.iter==self.end:
                raise StopIteration
            else:
                r = ValueItem(self.iter.get_valueno(), self.iter.get_value())
                self.iter.next()
                return r

    # Modify Document to add a "values()" method.
    def _document_gen_values_iter(self):
        """Get an iterator over all the values stored in a document.

        The iterator will return ValueItem objects, in ascending order of value number.

        """
        return ValueIter(self._values_begin(), self._values_end())
    Document.values = _document_gen_values_iter

    ##########################################
    # Support for iteration of value streams #
    ##########################################

    class ValueStreamItem(object):
        """An item returned from iteration of the values in a document.

        The item supports access to the following attributes:

         - `docid`: The docid for the item.
         - `value`: The contents of the value.

        """

        __slots__ = ('docid', 'value', )

        def __init__(self, docid, value):
            self.docid = docid
            self.value = value

    class ValueStreamIter(object):
        """An iterator over all the values stored in a document.

        The iterator will return ValueStreamItem objects, in ascending order of value number.

        """
        def __init__(self, start, end):
            self.iter = start
            self.end = end
            self.moved = True

        def __iter__(self):
            return self

        def next(self):
            if not self.moved:
                self.iter.next()
                self.moved = True

            if self.iter==self.end:
                raise StopIteration
            else:
                self.moved = False
                return ValueStreamItem(self.iter.get_docid(), self.iter.get_value())

        def skip_to(self, docid):
            """Skip the iterator forward.

            The iterator is advanced to the first document with a document ID
            which is greater than or equal to the supplied document ID.

            If there are no such items, this will raise StopIteration.

            This returns the item which the iterator is moved to.  The subsequent
            item will be returned the next time that next() is called (unless
            skip_to() is called again first).

            """
            if self.iter != self.end:
                self.iter.skip_to(docid)
            if self.iter == self.end:
                self.moved = True
                raise StopIteration
            self.moved = False
            return ValueStreamItem(self.iter.get_docid(), self.iter.get_value())

    # Modify Database to add a "valuestream()" method, and remove the
    # valuestream_begin() and valuestream_end() methods.
    def wrapper():
        vs_begin = Database.valuestream_begin
        del Database.valuestream_begin
        vs_end = Database.valuestream_end
        del Database.valuestream_end
        def valuestream(self, slot):
            """Get an iterator over all the values stored in a slot in the database.

            The iterator will return ValueStreamItem objects, in ascending order of
            document id.

            """
            return ValueStreamIter(vs_begin(self, slot), vs_end(self, slot))
        return valuestream
    Database.valuestream = wrapper()
    del wrapper

    ##########################################
    # Support for iteration of LatLongCoords #
    ##########################################

    class LatLongCoordsIter(object):
        """An iterator over all the coordinates in a LatLongCoords object.

        The iterator returns LatLongCoord objects.

        """
        def __init__(self, start, end):
            self.iter = start
            self.end = end

        def __iter__(self):
            return self

        def __eq__(self, other):
            return self.equals(other)

        def __ne__(self, other):
            return not self.equals(other)

        def next(self):
            if self.iter.equals(self.end):
                raise StopIteration
            else:
                r = self.iter.get_coord()
                self.iter.next()
                return r

    # Modify LatLongCoords to make it iterable.
    def _latlongcoords_iter(self):
        """Get an iterator over all the coordinates in a LatLongCoords.

        The iterator will return xapian.LatLongCoord objects.

        """
        return LatLongCoordsIter(self.begin(), self.end())
    LatLongCoords.__iter__ = _latlongcoords_iter
    del _latlongcoords_iter
    del LatLongCoordsIterator

    # Fix up Enquire so that it keeps a python reference to the deciders supplied
    # to it so that they won't be deleted before the Enquire object.  This hack can
    # probably be removed once xapian bug #186 is fixed.
    _enquire_add_matchspy_orig = Enquire.add_matchspy
    def _enquire_match_spy_add(self, decider):
        if not hasattr(self, '_deciders'):
            self._deciders = []
        self._deciders.append(decider)
        _enquire_add_matchspy_orig(self, decider)
    _enquire_match_spy_add.__doc__ = Enquire.add_matchspy.__doc__
    Enquire.add_matchspy = _enquire_match_spy_add

    _enquire_clear_matchspies_orig = Enquire.clear_matchspies
    def _enquire_match_spies_clear(self):
        _enquire_clear_matchspies_orig(self)
        if hasattr(self, '_deciders'):
            del self._deciders
    _enquire_match_spies_clear.__doc__ = Enquire.clear_matchspies.__doc__
    Enquire.clear_matchspies = _enquire_match_spies_clear

    # Fix up Stem.__init__() so that it calls __disown__() on the passed
    # StemImplementation object so that Python won't delete it from under us.
    _stem_init_orig = Stem.__init__
    def _stem_init(self, *args):
        _stem_init_orig(self, *args)
        if len(args) > 0 and isinstance(args[0], StemImplementation):
            args[0].__disown__()
    _stem_init.__doc__ = Stem.__init__.__doc__
    Stem.__init__ = _stem_init

    # Remove static methods which shouldn't be in the API.
    del Document_unserialise
    del Query_unserialise
    del Stem_get_available_languages

    # Add wrappers for Query::MatchAll and Query::MatchNothing
    Query.MatchAll = Query("")
    Query.MatchNothing = Query()

    # Set the list of names which should be public.
    # Note that this needs to happen at the end of xapian.py.
    __all__ = []
    for item in dir():
        if item.startswith('_') or item.endswith('_swigregister') or item.endswith('Iterator'):
            continue
        __all__.append(item)
    __all__ = tuple(__all__)