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Re: CR-14 value space of entities, notations, IDREFs

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 09 Mar 2001 11:51:28 +0000
To: James Clark <jjc@jclark.com>
Cc: "C. M. Sperberg-McQueen" <cmsmcq@acm.org>, W3C XML Schema Comments list <www-xml-schema-comments@w3.org>
Message-ID: <f5br907i2in.fsf@cogsci.ed.ac.uk>
To clarify one thing, we consided entities and notations quite
distinctly from IDREFs -- they're very different cases.

For entities and notations, another way to put our point is that if
you _do_ have the components, the difference between name and
component is trivial, but if you _don't_ it's enormous, so going for
the name makes sense.

For IDREF, the new draft goes to some length to distinguish between
type-validity for IDs and IDREFs, and document-validity for documents
including items validated with these types. It makes the former just a
matter of NCName lexical form, and only the latter involves notions of 
uniqueness and reference resolution, and is located in Part 1, not
Part 2.  Accordingly, since it doesn't make sense to include
reference-dependent information in the definition of the IDREF(S)
type(s) as such.

  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/
Received on Friday, 9 March 2001 06:51:33 UTC

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