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RE: [XPath 2.0] XPath 1.0 Compatibility Mode doesn't cover fn:number

From: Priscilla Walmsley <priscilla@walmsley.com>
Date: Fri, 30 Apr 2004 07:40:16 -0400
To: "'Don Chamberlin'" <chamberl@almaden.ibm.com>
Cc: <public-qt-comments@w3.org>
Message-Id: <20040430114052.D64DDA1BA8@frink.w3.org>
Hi Don,
 
Thanks! Yes, that does address both of those comments.
 
Priscilla


  _____  

From: Don Chamberlin [mailto:chamberl@almaden.ibm.com] 
Sent: Thursday, April 29, 2004 8:38 PM
To: Priscilla Walmsley
Cc: public-qt-comments@w3.org
Subject: Re: [XPath 2.0] XPath 1.0 Compatibility Mode doesn't cover
fn:number



Dear Priscilla, 
Thanks for your comments on the XPath 2.0 specification. The Query and XSLT
working groups considered your comment and agreed that changes are required
to the rules for function argument conversion in XPath 1.0 compatibility
mode. We believe that the changes outlined below address the following two
comments that you posted on this subject: 
http://lists.w3.org/Archives/Public/public-qt-comments/2004Feb/0081.html 
http://lists.w3.org/Archives/Public/public-qt-comments/2004Feb/0082.html 

The revised rules for function argument conversion in XPath 1.0
compatibility mode are as follows: 

If XPath 1.0 compatibility mode is true and the argument is not of the
expected type, then the following conversions are applied sequentially to
the argument value V: 
1. If the expected type calls for a single item or optional single item
(examples: xs:string, xs:string?, xdt:untypedAtomic, xdt:untypedAtomic?,
node(), node()?, item(), item()?), then the value V is effectively replaced
by V[1]. 
2. If the expected type is xs:string or xs:string?, then the value V is
effectively replaced by fn:string(V). 
3. If the expected type is a (possibly optional) numeric type, then the
value V is effectively replaced by fn:number(V). 

Please let us know whether you agree that these changes have resolved the
issues you raised regarding XPath 1.0 compatibility mode. 

Thank you,
--Don Chamberlin




"Priscilla Walmsley" <priscilla@walmsley.com> 
Sent by: public-qt-comments-request@w3.org 


02/04/2004 04:43 AM 


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[XPath 2.0]  XPath 1.0 Compatibility Mode doesn't cover fn:number

	





In Section 3.1.5, the function conversion rules in XPath 1.0 Compatibility
Mode don't cover the number() function itself, which expects
xdt:anyAtomicType?. If you pass number() a sequence of multiple values, in
XPath 1.0 Compatibility Mode, you would want only the first value to be
used.  Perhaps another bullet point should added to the list, saying:

If the expected type is xdt:anyAtomicType or xdt:anyAtomicType?, then the
given value V is effectively replaced by V[1].

Thanks,
Priscilla Walmsley
Received on Friday, 30 April 2004 07:40:52 UTC

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