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Re: XSV only finds some schemas?

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 15 Jun 2000 10:23:21 +0100
To: Dan Connolly <connolly@w3.org>
Cc: xmlschema-dev@w3.org
Message-ID: <f5b7lbri9h2.fsf@cogsci.ed.ac.uk>
Dan Connolly <connolly@w3.org> writes:

> On what basis does XSV decide to try to find a schema
> from the namespace name?

At the moment the validator invocation process works as follows:

First, it loads schema docs supplied on the command line
Second, it scans the document for xsi:schemaLocation hints, and loads
docs for namespaces which it doesn't already have a schema for
Finally if the above has not produced a schema for the namespace of
the doc element of the instance, it tries dereferencing that

During _schema document_ processing of docs found by the above three
routes, it loads <include>d schema docs, and uses a hint if present
and otherwise tries dereferencing the namespace URI for <import>s.

At the moment, it does not try dereferencing when in the middle of
processing and encountering a new unknown namespace.

So in your example it's not chasing the mathml namespace.  If you
supply it on the command line, you get some new, but plausible,
errors.

I'll look in to catching this, but it's a bit tricky.

Note your mathml schema doc is actually strictly speaking bogus,
because it has a foreign reference (html:body) with no <import> of the 
html namespace.  XSV doesn't catch this, but of course it should.

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 Thursday, 15 June 2000 05:23:31 GMT

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