This interface represents an entity defined in
an XML DTD. The name of the entity is specified by the
getNodeName( ) method inherited from the Node
interface. The entity content is represented by the child nodes of
the Entity node. The methods defined by this
interface return the public identifier and system identifier for
external entities, and the notation name for unparsed entities. Note
that Entity nodes and their children are not part
of the document tree (and the getParentNode( )
method of an Entity always returns
null). Instead a document may contain one or more
references to an entity: see the EntityReference
interface.Entities are defined in the DTD (document type definition) of a
document, either as part of an external DTD file, or as part of an
"internal subset" that defines
local entities that are specific to the current document. The
DocumentType interface has a getEntities(
) method that returns a NamedNodeMap
mapping entity names to Entity nodes. This is the
only way to obtain an Entity object: because they
are part of the DTD, Entity nodes never appear
within the document tree itself. Entity nodes and
all descendants of an Entity node are read-only
and cannot be edited or modified in any way.
Figure 21-10. org.w3c.dom.Entity
 public interface Entity extends Node {
// Public Instance Methods
5.0 String getInputEncoding ( );
String getNotationName ( );
String getPublicId ( );
String getSystemId ( );
5.0 String getXmlEncoding ( );
5.0 String getXmlVersion ( );
}
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