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Re: Substitution group chains - which can be abstract?

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 21 Apr 2003 09:56:23 +0100
To: Dan Vint <dvint@mindspring.com>
Cc: xmlschema-dev@w3.org
Message-ID: <f5b4r4srzyg.fsf@erasmus.inf.ed.ac.uk>

Dan Vint <dvint@mindspring.com> writes:

> I see what you are trying to do, I'm thinking you can't get there from here.

Um, yes he can.  The substitution group mechanism supports precisely
the design pattern Xan demonstrated.  Substitution groups were
designed to reconstruct the common use of parameter entities to
reflect a hierarchical structuring of the element types in an SGML
document type, in which we quite often see a hierarchy of some depth
before we get to actual elements.  See _Developing SGML DTDs_, by Eve
Maler and Jeanne El Andaloussi.

  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
                      Half-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/
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Received on Monday, 21 April 2003 04:56:26 UTC

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