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ID-ness is not the same as type (Re: [xml-dev] Re: determining ID-nessin XML)

Bob's comments remind me of one of the good things about the XML
Schema key/keyref mechanism -- it separates 'being a key' from 'being
a string/integer/date'.  SGML and then XML conflated these two, which
was with hindsight a mistake.

It would be nice if whatever solution we come up with didn't make that 
mistake again.  I _think_ the xml:idatt(s) proposal at least could be
understood to be _additional_ information about an attribute.

  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/