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   XPointer and XML Schema

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Is anyone else concerned about the language in the latest XPointer Last Call 
Working Draft that refers to XML Schema?

"If the document has an XML Schema [XMLSchema] PSVI,..."

I know what a PSVI is, and how to get one. What I don't know is what it 
means for a document to "have" a PSVI, or how to determine if a document has 
one, or which PSVI to use if it has more than one.

Remember that the xsi:schemalocation attribute is a "hint". There may be 
other hints, I may have my own ideas about what XML Schema is appropriate, 
or there may be no hints but a common understanding of what XML Schema I 
should use (perhaps in the software of some vendors).

If XPointer is going to depend on XML Schema, it should do so in a 
well-specified way.

I can think of several ways to fix this:
   1. Drop XMLSchema entirely from XPointer
   2. Add an XMLSchema(...) XPointer Scheme
   3. Make the schemalocation hint manditory to provide, and manditory to 
dereference for Schema-Loading, WRT XPointer.

I'm worried that instead we will get
   4. Do nothing, and hope it works itself out.
since XPointer is on the Fast-Track to Rec.

-Wayne Steele

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