Update xml:id specification

I've updated xml:id:

  http://www.w3.org/XML/Group/2004/xmlcore/xmlid/xml-id.html

and produced a diff:

  http://www.w3.org/XML/Group/2004/xmlcore/xmlid/diff-20050906.html

DoC document to follow.

                                        Be seeing you,
                                          norm

-- 
Norman.Walsh@Sun.COM / XML Standards Architect / Sun Microsystems, Inc.
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