 |
An XML document may contain a doctype declaration (DTD),
which may include a DTD subset clause in square
brackets.
-
The DTD is one way of associating the document with its schema
(but is not used by W3C or Relax NG for this purpose)
-
The DTD subset is used to provide declarations additional to
those in the schema
-
The DTD subset may be internal,
external, or both
|