• To: "'Chiusano Joseph'" <chiusano_joseph@b...>, Murali Mani <mani@C...>
• Subject: RE: having problems with the "|" in field's element in the xs:key el ement
• From: Jeff Lowery <Jeff.Lowery@c...>
• Date: Tue, 20 May 2003 10:37:18 -0700
• Cc: Bill Riegel <BRiegel@l...>, "'xml-dev@l...'" <xml-dev@l...>

> From: Chiusano Joseph [mailto:chiusano_joseph@b...]

> The use of the "|" (union) operator is valid in the xs:field 
> element, as
> the contents of this field must be a valid XPath expression 
> (and "|" is
> a component of a valid XPath expression).

Joseph,  XPaths are restricted in XML Schema:

Path   ::=   ('.//')? ( Step '/' )* ( Step | '@' NameTest )

Step   ::=   '.' | NameTest

NameTest   ::=   QName | '*' | NCName ':' '*'

The only ORs I see here are the BNF ORs.  

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