public interface DocumentTraversal
DocumentTraversal contains methods that create
 NodeIterators and TreeWalkers to traverse a
 node and its children in document order (depth first, pre-order
 traversal, which is equivalent to the order in which the start tags occur
 in the text representation of the document). In DOMs which support the
 Traversal feature, DocumentTraversal will be implemented by
 the same objects that implement the Document interface.
 See also the Document Object Model (DOM) Level 2 Traversal and Range Specification.
| Modifier and Type | Method and Description | 
|---|---|
| NodeIterator | createNodeIterator(Node root,
                  int whatToShow,
                  NodeFilter filter,
                  boolean entityReferenceExpansion)Create a new  NodeIteratorover the subtree rooted at the
 specified node. | 
| TreeWalker | createTreeWalker(Node root,
                int whatToShow,
                NodeFilter filter,
                boolean entityReferenceExpansion)Create a new  TreeWalkerover the subtree rooted at the
 specified node. | 
NodeIterator createNodeIterator(Node root, int whatToShow, NodeFilter filter, boolean entityReferenceExpansion) throws DOMException
NodeIterator over the subtree rooted at the
 specified node.root - The node which will be iterated together with its
   children. The NodeIterator is initially positioned
   just before this node. The whatToShow flags and the
   filter, if any, are not considered when setting this position. The
   root must not be null.whatToShow - This flag specifies which node types may appear in
   the logical view of the tree presented by the
   NodeIterator. See the description of
   NodeFilter for the set of possible SHOW_
   values.These flags can be combined using OR.filter - The NodeFilter to be used with this
   NodeIterator, or null to indicate no
   filter.entityReferenceExpansion - The value of this flag determines
   whether entity reference nodes are expanded.NodeIterator.DOMException - NOT_SUPPORTED_ERR: Raised if the specified root is
   null.TreeWalker createTreeWalker(Node root, int whatToShow, NodeFilter filter, boolean entityReferenceExpansion) throws DOMException
TreeWalker over the subtree rooted at the
 specified node.root - The node which will serve as the root for the
   TreeWalker. The whatToShow flags and the
   NodeFilter are not considered when setting this value;
   any node type will be accepted as the root. The
   currentNode of the TreeWalker is
   initialized to this node, whether or not it is visible. The
   root functions as a stopping point for traversal
   methods that look upward in the document structure, such as
   parentNode and nextNode. The root must
   not be null.whatToShow - This flag specifies which node types may appear in
   the logical view of the tree presented by the
   TreeWalker. See the description of
   NodeFilter for the set of possible SHOW_
   values.These flags can be combined using OR.filter - The NodeFilter to be used with this
   TreeWalker, or null to indicate no filter.entityReferenceExpansion - If this flag is false, the contents of
   EntityReference nodes are not presented in the logical
   view.TreeWalker.DOMException - NOT_SUPPORTED_ERR: Raised if the specified root is
   null. Submit a bug or feature
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