DTDto

The dtdto utility parses an XML DTD and provides the following output options:

• An XML representation of the DTD, providing a complete representation of the parsed DTD, suitable for subsequent processing by an XSLT script.
• Documentation for the DTD in either HTML or Docbook format. Within the DTD, any comment directly followed by a line break and an element declaration is considered to be applicable to that element, and will be included as such in the documentation. A similar convention is applied for entity declarations, except that a comment directly following an entity declaration, with no separating line break, is also considered to be applicable to that entity.
• An XSLT script for validating an XML document with respect to the DTD. Validation is performed by a Deterministic Finite Automaton constructed from content model regular expressions.

dtdto is distributed with the XML::DTD Perl module, available from CPAN.