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From: "Henry S. Thompson" <email@example.com>
> > I don't think use of <xs:any> etc is enough to allow us to use two
> > XML Schema schemas in series.
> Not obvious why this won't work -- I hadn't thought of it but it's a
> good idea, if your locale-specific variants are not of the
> optional->required/prohibited variety.
Being able to take a few passes at the data is a really useful technique.
The effective schema is an intersection of schemas.
It is built into Schematron (each pattern equivalent to a pass, though it
may not be implemented that way), and I see James Clark was able
to represent the exclusions in HTML using three passes in RELAX NG
(one for the general schema, one for the restriction that an <a> cannot
contain a child <a> at any level, and something else: presumably
XSD would require the same, sniff :-)