W3C home > Mailing lists > Public > www-forms@w3.org > October 2001

Re: Strange construction in XForms schema

From: Eric van der Vlist <vdv@dyomedea.com>
Date: Mon, 08 Oct 2001 14:53:12 +0200
Message-ID: <3BC1A1B8.9060008@dyomedea.com>
To: www-forms@w3.org
Josef Dietl wrote:

> You are right, effectively we are building something that wasn't
> possible if "written out" - but as so often in computer sciences, one
> level of indirection solves every problem.

I wish this was true with W3C XML Schema :=( ...

The restrictions of use with xs:all have been discussed at length before 
the specification went to Recommendation and they are here because of 
potential problems with the implementation of schema validators as 
finite state machines that you won't workaround by embedding a xs:all 
within a xs:group.

Whether documented or not in the Recommendation, doing so probably means 
that 50% of the schema validators will blow up trying to validate some 
of the combinations you expect to allow by the schema.


> Josef

Rendez-vous  Paris pour une visite guidee de la nebuleuse XML.
Eric van der Vlist       http://xmlfr.org            http://dyomedea.com
http://xsltunit.org      http://4xt.org           http://examplotron.org
Received on Monday, 8 October 2001 08:52:53 UTC

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