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Re: b*c*b*c* vs. (b*c*)^2,2

From: Henry S. Thompson <ht@inf.ed.ac.uk>
Date: Thu, 12 Feb 2004 12:31:36 +0000
To: Torsten Grust <Torsten.Grust@uni-konstanz.de>
Cc: "Michael Kay" <mhk@mhk.me.uk>, <xmlschema-dev@w3.org>
Message-ID: <f5bwu6s4gyf.fsf@erasmus.inf.ed.ac.uk>

Torsten Grust <Torsten.Grust@uni-konstanz.de> writes:

> Thanks Henry and Michael for these quick and very helpful responses.
> Only to double-check that I am on the right track now: from your
> answers I take it that the XML Schema Unique Particle Attribution
> constraint is the same concept as ``weak unambiguity'' (as defined in
> Anne Brueggemann-Klein's papers).

Yes -- Brueggemann-Klein's work was motivated by the need for a formal
definition of what the SGML standard did not succeed in expressing
very clearly.

> (Which, for example, an XML Schema processor could use during
> validation to attach type annotations to XML element nodes.)
> Does this make sense?

Indeed, precisely the point.

 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@inf.ed.ac.uk
                   URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged spam]
Received on Thursday, 12 February 2004 07:32:55 UTC

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