Re: [xml-dev] The purpose of a namespace URI is ...

["G. Ken Holman" <gkholman@CraneSoftwrights.com>]

At 2012-11-30 08:16 -0500, Michael Sokolov wrote:
>On 11/30/2012 7:46 AM, G. Ken Holman wrote:
>>At 2012-11-30 12:35 +0000, Costello, Roger L. wrote:
>>>     A namespace URI conventionally identifies
>>>     the component, subsystem, or authority
>>>     responsible for defining the meaning of
>>>     an XML vocabulary.
>>>
>>>Do you agree?
>>
>>A namespace URI only distinguishes one XML vocabulary from another 
>>in a single XML document.
>Also across documents in a collection, or universally, no?

Sure ... the qualification of the elements and attributes 
distinguishes the vocabularies in a single document so, yes, I 
suppose the convention of using the same qualifications across a 
collection of documents is helpful:

   http://www.w3.org/TR/2006/REC-xml-names11-20060816
   Abstract
   XML namespaces provide a simple method for qualifying element and
   attribute names used in Extensible Markup Language documents by
   associating them with namespaces identified by IRI references.

Does it do so universally?  Only if everyone plays by the rules.  If 
I create my own XML vocabulary and foolishly qualify my elements with 
a URI used by the W3C, then I may have document-wide distinction or 
even distinction within a collection of my own documents, but I don't 
have universal distinction because my vocabulary identification is 
ambiguous with that from the W3C.

I hope this is helpful.

. . . . . . Ken

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