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Re: The purpose of a namespace URI is ...

• From: "G. Ken Holman" <gkholman@CraneSoftwrights.com>
• To: "xml-dev@lists.xml.org" <xml-dev@lists.xml.org>
• Date: Fri, 30 Nov 2012 10:02:32 -0500

At 2012-11-30 14:16 +0000, David Carlisle wrote:
>On 30/11/2012 13:16, Michael Sokolov wrote:
>>>A namespace URI only distinguishes one XML vocabulary from another
>>>in a single XML document.
>>Also across documents in a collection, or universally, no?
>
>That depends on what you mean by "distinguish" and what you (or Roger)
>mean by "XML Vocabulary".

That was me, David, who used the word "distinguish" and I don't think 
your examples necessarily prevent that word from being used.

>an xhtml 1.1 strict table has a different content model than an xhtml
>1.1 transitional one, but both are represented by the element table in
>namespace http://www.w3.org/1999/xhtml
>
>Similarly an an xslt variable element has different attributes defined
>in XSLT 1 and 2 but both use the element name variable in namespace
>http://www.w3.org/1999/XSL/Transform
>whether XSLT 1 and 2 are different vocabularies or different versions of
>the same vocabulary is arbitrary depending on how you define the terms,
>but they definitely use the same namespace.

Using the URI http://www.w3.org/1999/XSL/Transform distinguishes 
elements in a stylesheet from those elements using the URI 
http://www.w3.org/1999/XSL/Format or the URI 
http://www.w3.org/1999/xhtml regardless of which version of each of 
the three vocabularies is being used.

And I think the use of the word "qualification" in the namespaces 
abstract I quoted only goes as far as distinguishing one construct 
from another, not any particular version of those vocabularies that 
are distinguished by qualification.

Unless someone wants to crack open the nut again of using version 
indicators in namespace URI strings.  I certainly don't.

. . . . . . . . Ken


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• Follow-Ups:
  • Re: The purpose of a namespace URI is ...
    • From: Fraser Goffin <goffinf@gmail.com>

• References:
  • The purpose of a namespace URI is ...
    • From: "Costello, Roger L." <costello@mitre.org>
  • Re: The purpose of a namespace URI is ...
    • From: "G. Ken Holman" <gkholman@CraneSoftwrights.com>
  • Re: The purpose of a namespace URI is ...
    • From: Michael Sokolov <sokolov@ifactory.com>
  • Re: The purpose of a namespace URI is ...
    • From: David Carlisle <davidc@nag.co.uk>