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XPATH in Schema keyrefs: Do they "understand" substitution groups

From: "David Blickstein" <db@--.--->
To: NULL
Date: 4/1/2005 3:53:00 PM
Suppose I have an XML Schema that contains a keyref that is part of a
substitution group.

Let's say I have a "Product" element that contains a field ProductID that is
a key reference.   The xs:key selector might be "catalog/Product".

Now if I add elements (let's say "Shirt" and "Shoes") that have "Product" as
a substitution group (they are derived from and can be substituted for
product) would <Shirt ProductID=34> be considered a keyref (and validated
accordingly), or would I have to provide a selector that specifically
matches "Shirt" and "Shoes"?

A second question is... in general... are XML processors that read-in Schema
generally "aware" of substitution groups?  That is, in general, do I have to
modify XML apps everytime a new element tag is added to the Product
substitution group?

Thanks




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