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In article <1126536990.29765.242713147@webmail.messagingengine.com> you write:
>Now, to comment on your reply, which does seem to be right (where in
>the XML 1.0 spec does it specifically say DTDs are not allowed to
>constrain as I'd like it to?)
http://www.w3.org/TR/REC-xml/#sec-mixed-content
>From a philosophical perspective, I find it sort of perplexing why
>there is this seeming limitation imposed upon DTDs.
It's a consequence of XML being a simplified subset of SGML.
>It would seem, in the case I ask about, that a future version of XML
>could easily, and without breaking current XML documents and DTDs,
>give DTDs greater power at specifying constraints.
There is unlikely ever to be a future version of XML that changes
DTDs. No-one wants to work on such a specification, and no-one wants
to implement it.
A more likely change (though still unlikely I think) is the complete
removal of DTDs.
If you want to constrain the content of your XML documents in ways that
DTDs don't support, consider the various schema tools.
-- Richard
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