Information about the notations and entities declared by a document
(including the external subset if the parser uses it and can provide
the information) is available from a DocumentType object. The
DocumentType for a document is available from the
Document object's doctype attribute; if there is no
DOCTYPE declaration for the document, the document's
doctype attribute will be set to None instead of an
instance of this interface.
DocumentType is a specialization of Node, and adds the
following attributes:
publicId
The public identifier for the external subset of the document type
definition. This will be a string or None.
systemId
The system identifier for the external subset of the document type
definition. This will be a URI as a string, or None.
internalSubset
A string giving the complete internal subset from the document.
This does not include the brackets which enclose the subset. If the
document has no internal subset, this should be None.
name
The name of the root element as given in the DOCTYPE
declaration, if present.
entities
This is a NamedNodeMap giving the definitions of external
entities. For entity names defined more than once, only the first
definition is provided (others are ignored as required by the XML
recommendation). This may be None if the information is not
provided by the parser, or if no entities are defined.
notations
This is a NamedNodeMap giving the definitions of notations.
For notation names defined more than once, only the first definition
is provided (others are ignored as required by the XML
recommendation). This may be None if the information is not
provided by the parser, or if no notations are defined.
