RE: Namespaces, W3C XML Schema (was Re: ANN: SAX FiltersforNamespaceProcessing)

["David E. Cleary" <davec@progress.com>]

> > <!-- schema definition -->
> > <s:schema xmlns:s="http://www.w3.org/2001/XMLSchema"
> >     xmlns:tns="http://example.org/foo"
> >     targetNamespace="http://example.org/foo"
> >     elementFormDefault="qualified">
> >   <s:element name="bar" type="s:string"/>
> >   <s:complexType name="fooType">
> >     <s:sequence>
> >       <s:element name="bar" type="s:string"/>
> >     </s:sequence>
> >   </s:complexType>
> >   <s:element name="foo" type="tns:fooType"/>
> > </s:schema>
> >
> > <!-- instance -->
> > <f:foo xmlns:f="http://example.org/foo">
> >   <f:bar/>   <--|
> > </f:foo>        |
> >                 |
> >                 |
> > Even when everything is qualified, you still can't figure out which bar
> > element this is just by looking at the QName and ignoring context (is it
> > the global or local qualified bar element?).
>
> This doesn't feel like the same problem to me - it feels like a bad case
> of non-deterministic content modeling.  I thought XML Schema went to
> great lengths to avoid that, but maybe this is legal.

That is not a valid schema.

Dave