Name for XML DTDs

James K. Tauber jtauber at
Mon May 25 08:52:21 BST 1998

> XSchema does not disqualify the wider use of the word
> "schema", any more than "XPointer" makes it difficult to talk about TEI
Pointers or
> C++ Pointers or XLink makes it difficult to talk about SGML implicit link,
> HTML <LINK> etc.

Fair enough.

> > How about XTD?  It could stand for Extensible Type Definition or XML
> > Definition.
> I also like this, as long as we get the plurality right. Each document
> will have multiple type definitions within it. So it makes sense to say
> "here's my XTD document", but not "here's my XTD" (which would imply a
> single definition).

This is an important point. An XTD is like a markup declaration. An XTD
document is a collection of XTDs. It encourages the modularity of the

There is a sense in which "Document Type Definition" is misleading for
things like CALS tables or MathML. They aren't definitions of document
types, rather they are definitions of element types. "Extensible Type
Definition" makes this clearer.


James Tauber / jtauber at
Perth, Western Australia
XML Pages:

xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev at
Archived as:
To (un)subscribe, mailto:majordomo at the following message;
(un)subscribe xml-dev
To subscribe to the digests, mailto:majordomo at the following message;
subscribe xml-dev-digest
List coordinator, Henry Rzepa (mailto:rzepa at

More information about the Xml-dev mailing list