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   RE: [xml-dev] Schema-type-aware SAX processing

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> > 
> > What am I missing?
> The problem is that the type of an element may depend on its 
> context, not
> just on its name, namespace, etc. Because of this ontological 
> component,
> type and validation are related, and it is not (deterministically)
> possible to decide the type of an element at the point it is 
> referenced
> during SAX processing.

W3C XML Schema is expressly designed so that you *can* determine the type of
an element without such lookahead. Most of the time we complain about the
restrictions this imposes (the infamous UPA constraint), but there are times
when we can be grateful for it...

Michael Kay


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