Patrick H. Lauke wrote:
generic XML + CSS would be meaningless without some third technology that defines semantics (a DTD, XBL, etc)

Neither a DTD nor XBL define document semantics at all. A DTD only defines the document syntax and structure. XBL is only a binding language for attaching behaviour to an element, it doesn't define semantics either.

The closest thing there is for describing semantics is the XML namespace, but even then it only loosely associates the elements with the semantics defined in the relevant specification (if one exists).

See this post for an interesting discussion of why DTDs don't define semantics.
http://groups.google.fi/group/comp.text.sgml/msg/c3e53dee2c152a81?output=gplain

--
Lachlan Hunt
http://lachy.id.au/

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