@Target(value={}) @Retention(value=RUNTIME) public @interface ForeignKey
 The ConstraintMode value is used to specify whether foreign
 key constraints should be generated.
 
 The syntax used in the foreignKeyDefinition element 
 should follow the SQL syntax used by the target database for foreign
 key constraints.  For example, this may be similar the following:
 
 FOREIGN KEY ( <COLUMN expression> {, <COLUMN expression>}... )
 REFERENCES <TABLE identifier> [
     (<COLUMN expression> {, <COLUMN expression>}... ) ]
 [ ON UPDATE <referential action> ]
 [ ON DELETE <referential action> ]
 
 When the ConstraintMode value is
 CONSTRAINT, but the foreignKeyDefinition
 element is not specified, the provider will generate foreign key
 constraints whose update and delete actions it determines most
 appropriate for the join column(s) to which the foreign key
 annotation is applied.JoinColumn, 
JoinColumns, 
MapKeyJoinColumn, 
MapKeyJoinColumns, 
PrimaryKeyJoinColumn, 
JoinTable, 
CollectionTable, 
SecondaryTable, 
AssociationOverride| Modifier and Type | Optional Element and Description | 
|---|---|
| String | foreignKeyDefinition(Optional) The foreign key constraint definition. | 
| String | name(Optional) The name of the foreign key constraint. | 
| ConstraintMode | value(Optional) Used to specify whether a foreign key constraint should be
  generated when schema generation is in effect. | 
public abstract String name
public abstract ConstraintMode value
  A value of CONSTRAINT will cause the persistence
  provider to generate a foreign key constraint.  If the
  foreignKeyDefinition element is not specified, the
  provider will generate a constraint whose update
  and delete actions it determines most appropriate for the
  join column(s) to which the foreign key annotation is applied.
  
  A value of NO_CONSTRAINT will result in no
  constraint being generated.
  
  A value of PROVIDER_DEFAULT will result in the
  provider's default behavior (which may or may not result
  in the generation of a constraint for the given join column(s).
public abstract String foreignKeyDefinition
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