Namespaces and XML validation

[Tim Bray]

At 01:07 PM 8/7/98 -0400, John Cowan wrote:
>Okay.  So you can validate provided you are willing not only to
>rewrite the DTD (which is reasonable) but to rewrite the instance
>too!  

The re-writing is pretty mechanical... having said that, I agree that
the real lesson is that the requirement for a new schema facility which
is a DTD superset and also namespace-sensitive is becoming glaringly
obvious.  

>That concedes in effect that there are instances which
>simply *cannot* be validated, because they use the same QNames
>in inconsistent ways.

That doesn't follow; you can certainly construct a DTD to describe
any conceivable well-formed instance.  If what you're saying is
that a single namespace contains usages of the same element or attribute
that are so wildly inconsistent that a DTD won't be helpful, then
that is a problem of that namespace which would exist even were it
standing alone - thus is orthogonal to the issue of namespaces. -Tim

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