RE: [xml-dev] Why this restriction? (was Constraining a "mixed" mixed content model (XHTML <div>))

> 
> To answer your last question first, I do not wish to add any new
> elements to the XHTML vocabulary I'm now using. So I'm stuck with
> having to use XHTML <div>.

It's your choice.
> 
> 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?)

Section 3.2.2, specifically the syntax of production 51.
> 
> From a philosophical perspective, I find it sort of perplexing why
> there is this seeming limitation imposed upon DTDs. 

There's a lot of history here, but I'm not well versed in it.

Michael Kay
http://www.saxonica.com/