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Re: Xpath 1.0 and 2.0

From: David Carlisle <davidc@nag.co.uk>
Date: Fri, 5 Nov 2004 16:00:45 GMT
Message-Id: <200411051600.QAA21174@penguin.nag.co.uk>
To: mhk@mhk.me.uk
CC: jonathan.robie@datadirect.com, www-xpath-comments@w3.org


Michael is correct to state that W3C policy essentially prohibits
changing existing documents, however it is possible to arrange that
documents contain forward pointers to possible future recs.

The MathML 2 "2nd edition" REC was one of the first to get to a 2nd
edition of a 2nd release, and after some confusion during working draft
stage as to what the "latest version" links should point to we finally
came to the following scheme in consultation with the W3C web team.

the document header has the links:


This version:
http://www.w3.org/TR/2003/REC-MathML2-20031021/ 
Latest MathML 2 version:
http://www.w3.org/TR/MathML2/ 
Latest MathML Recommendation:
http://www.w3.org/TR/MathML/ 

Currently all of those point to the same thing however if we bring out
mathml2 3rd edition, the second and third ones one will redirect to the
new spec. if we bring out a mathml 3 then the second one will not change
but the third one would then redirect to the mathml 3 spec.

so although the actual visible page at
http://www.w3.org/TR/2003/REC-MathML2-20031021/ 
will never change it will always have links to the latest versions of
mathml.

For this to work for Xpath and friends TR space would need to allocate
"version independent" URIs cf
http://www.w3.org/TR/MathML
in addition to
version specific URIs
http://www.w3.org/TR/MathML2/ 
and of course dated document specific URIs
http://www.w3.org/TR/2003/REC-MathML2-20031021


You can only do this for new documents though (MathML 1 doesn't have a
link to MathML 2 for example) so such a scheme could only apply for
xpath2 and up not xpath1 as the original poster requested.

David
Note I am _not_ a member of any WG connetcted with XPath/XSLT/Xquery

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Received on Friday, 5 November 2004 16:01:04 GMT

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