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This list the "|" has a valid option. 

Bill Riegel
LandMark Graphics
713-839-3388

-----Original Message-----
From: Jeff Lowery [mailto:Jeff.Lowery@c...] 
Sent: Tuesday, May 20, 2003 12:11 PM
To: 'Murali Mani'; Bill Riegel
Cc: 'xml-dev@l...'
Subject: RE:  having problems with the "|" in field's element in
the xs:key el ement

The syntactic restrictions on XPath expressions in XML Schema are given by:

http://www.w3.org/TR/xmlschema-1/#coss-identity-constraint

I don't know of any method for doing what you're trying to do in XML Schema.
No doubt Schematron annotations are an option.  

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