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Norman Walsh wrote:
[bunch of sensible stuff deleted]
> Extending DTDs to work outside this environment, by means of a PI for
> example that mapped prefixes to URIs in the DTD, would make a parser
> that accepted documents that were not XML 1.0 valid but were XML
> 1.0+Namespaces valid. It'd be an interesting exercise.
>
The problem is that for the internal subset, no mapping is needed because
the prefix->URI mapping can be obtained from the content context. The
problem exists for external DTDs which could use a PE to 'substitute' the
{file://foo}aaa notation for the xxx:aaa notation, if this notation were
adopted as part of the DTD syntax.
i.e.
[
<!ELEMENT root (xxx:aaa)* >
]
<root xmlns:xxx="file://foo" xmlns:yyy="file://foo" >
<xxx:aaa/>
<yyy:aaa/>
</root>
would be namespace valid.
Alternatively:
<!ELEMENT root ({file://foo}aaa)*>
would allow definition of expanded names even in an external subset.
Jonathan Borden
The Open Healthcare Group
http://www.openhealth.org
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