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Re: XSV and Base attribute checking...

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 02 Oct 2000 09:24:18 +0100
To: "Jeff Rafter" <jeffrafter@definedweb.com>
Cc: <xmlschema-dev@w3.org>
Message-ID: <f5b66nbzm4t.fsf@cogsci.ed.ac.uk>
"Jeff Rafter" <jeffrafter@definedweb.com> writes:

> Does XSV check the "base" attribute of extension and restriction elements--
> to ensure 1) that it exists, 

Only at instance validation time, not at schema validation time (as
there might be other sources available at use time).

> 2) that the base is not final;

yes

> 3) that it is extendable

All types are in principle extendable

> (as in the case of anyType)?

This is only not extendable because of the Unique Attribution
requirement, which is checked.

ht
-- 
  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 Monday, 2 October 2000 04:24:21 UTC

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