• To: Jeff Lowery <Jeff.Lowery@c...>
• Subject: Re: having problems with the "|" in field's element inthe xs:key el ement
• From: "Chiusano Joseph" <chiusano_joseph@b...>
• Date: Tue, 20 May 2003 13:43:14 -0400
• Cc: Murali Mani <mani@C...>, Bill Riegel <BRiegel@l...>, "'xml-dev@l...'" <xml-dev@l...>
• Organization: BAH
• References: <4827EC373E03DB44AC2AB3900430896B67225D@c...>

Please help me out here - from Schema Part 1:

"{fields} specifies XPath expressions relative to each element selected
by a {selector}. This must identify a single node (element or attribute)
whose content or value, which must be of a simple type, is used in the
constraint. It is possible to specify an ordered list of {fields}s, to
cater to multi-field keys, keyrefs, and uniqueness constraints"

ALSO

"{fields} 
A non-empty list of restricted XPath ([XPath]) expressions."

Clicking on [XPath] above yields a URL to the XPath 1.0 spec.

Please confirm what I may be missing.

Thanks,
Joe Chiusano
Booz | Allen | Hamilton

Jeff Lowery wrote:
> 
> > 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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n:Chiusano;Joseph
tel;work:(703) 902-6923
x-mozilla-html:FALSE
url:www.bah.com
org:Booz | Allen | Hamilton;IT Digital Strategies Team
adr:;;8283 Greensboro Drive;McLean;VA;22012;
version:2.1
email;internet:chiusano_joseph@b...
title:Senior Consultant
fn:Joseph M. Chiusano
end:vcard

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