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Re: having problems with the "|" in field's element inthe xs

• To: "Chiusano Joseph" <chiusano_joseph@b...>
• Subject: Re: having problems with the "|" in field's element inthe xs:key el ement
• From: ht@c... (Henry S. Thompson)
• Date: 22 May 2003 11:43:08 +0100
• Cc: Jeff Lowery <Jeff.Lowery@c...>, Murali Mani <mani@C...>, Bill Riegel <BRiegel@l...>, "'xml-dev@l...'" <xml-dev@l...>
• In-reply-to: <3ECA6932.3E25A19@b...>
• References: <4827EC373E03DB44AC2AB3900430896B67225D@c...><3ECA6932.3E25A19@b...>
• Sender: ht@i...
• User-agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.4 (Portable Code)

"Chiusano Joseph" <chiusano_joseph@b...> writes:

> 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.

You're not missing anything -- Jeff missed one production, namely:

  [Field] ::= Path ( '|' Path )*

> 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.

-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
                      Half-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@c...
		     URL: http://www.ltg.ed.ac.uk/~ht/
 [mail really from me _always_ has this .sig -- mail without it is forged spam]

• References:
  • RE: having problems with the "|" in field's element in the xs:key el ement
    • From: Jeff Lowery <Jeff.Lowery@c...>
  • Re: having problems with the "|" in field's element inthe xs:key el ement
    • From: "Chiusano Joseph" <chiusano_joseph@b...>

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