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RE: pattern and union types

From: Ashok Malhotra <ashokma@microsoft.com>
Date: Wed, 20 Nov 2002 07:01:18 -0800
Message-ID: <E5B814702B65CB4DA51644580E4853FB03DA7647@red-msg-12.redmond.corp.microsoft.com>
To: "Henry S. Thompson" <ht@cogsci.ed.ac.uk>, <www-xml-schema-comments@w3.org>

This is a useful clarification that we should plan to add in 1.1.
Thanks, Henry!

All the best, Ashok

-----Original Message-----
From: Henry S. Thompson [mailto:ht@cogsci.ed.ac.uk] 
Sent: Tuesday, November 19, 2002 2:30 PM
To: www-xml-schema-comments@w3.org
Subject: pattern and union types


Is it clear what string the pattern facet of a union type applies to?

Seems to me it should be the lexical space value of the winning type
in the union, i.e. when processing an item with a union type, we go
directly to the member type definitions, and for each one in turn:

 1) normalize per the whiteSpace facet _of that member type defn_;
 2) check the pattern facet of the union type itself;
 3) check the pattern facet of the member type defn;
 4) convert to value and check other facets from the member type defn.

If any of (2), (3) or (4) fail, go on to the next member type defn.

I don't think the REC as it currently stands makes clear that this is
what happens, or that it doesn't, but I'm tired and could be missing
something.

ht
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of
Edinburgh
          W3C Fellow 1999--2002, 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/
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Received on Wednesday, 20 November 2002 10:02:27 GMT

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