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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;


> 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.

  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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