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   Namespaces and DTDs - Why not use what we have?

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Title: Namespaces and DTDs - Why not use what we have?

It seems a shame to "break" XML to try and get namespaces into DTDs. I haven't fully considered the implications of it, but imagine what would happen if a namespaced XSD or Relax schema was based on a version of XML which included namespaces. Wouldn't we now have namespaces being defined by two different mechanisms? Don't you think this would get very ugly, very quickly? Wouldn't it be fun to override namespaces using internal subsets, or perhaps recursively build up namespace identifiers using entities.

With a lot of people potentially switching to Relax and XSD over the coming year(s), there would seem to be some doubt whether there are sufficient use cases or sufficient ROE to try and implement namespaces in DTDs "natively".

However, people who are using DTDs with namespaces at the moment follow a fairly common convention (which admittedly results in some rather wierd constructs, but there you go) using parameter entities and so on.

Wouldn't it make more sense to take this informal mechanism as a starting point and formalize it?


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