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Re: [Moderator Action] XSV fails on simple test cases work

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 16 Dec 2000 10:45:52 +0000
To: Marc Horowitz <marc@mit.edu>
Cc: xmlschema-dev@w3.org
Message-ID: <f5bhf44bq5b.fsf@cogsci.ed.ac.uk>
Marc Horowitz <marc@mit.edu> writes:

> I'm trying to get XSV to work, and I'm having a lot of trouble.
> Environment: Debian Linux, python 1.5.
> 
> I'm using ltxml 1.2, PyLTXML 1.2, and XSV checked out of cvs on 12/13.
> 
> I'm just starting out with XML Schemas, so I may have obvious errors,
> but even very simple testcases seem to fail.
> 
> -- tiny.xsd --
> <schema xmlns="http://www.w3.org/2000/10/XMLSchema"
> 	xmlns:xsi="http://www.w3.org/2000/10/XMLSchema-instance"
> 	xmlns:ela="http://www.mit.edu/people/marc/xmlschemas/tiny/1.0"
> 	targetNamespace="http://www.mit.edu/people/marc/xmlschemas/tiny/1.0">
>   <element name="foo" type="string" />
> </schema>
> -- --
> 
> -- tiny.xml --
> <tiny:foo xmlns:xsi="http://www.w3.org/2000/10/XMLSchema-instance"
> 	  xmlns:tiny="http://www.mit.edu/people/marc/xmlschemas/ela/1.0" />
> -- --
> 
> When I run applyschema.py, I get:
> 
> % python ./applyschema.py -w ~/xml/tiny.xml ~/xml/tiny.xsd
> <?xml version='1.0' encoding='unspecified-ascii-superset'?>
> <xsv docElt='{http://www.mit.edu/people/marc/xmlschemas/ela/1.0}foo' instanceAssessed='true' instanceErrors='0' nsURIDeref='success' schemaDocs='/home/marc/xml/tiny.xsd' schemaErrors='0' schemaLocs='' target='/home/marc/xml/tiny.xml' validation='lax' version='XSV 1.173/1.82 of 2000/10/31 16:30:47' xmlns='http://www.w3.org/2000/05/xsv'>
> <notASchema filename='/home/marc/xml/tiny.xsd'/>
> <importAttempt URI='http://www.mit.edu/people/marc/xmlschemas/ela/1.0' namespace='http://www.mit.edu/people/marc/xmlschemas/ela/1.0' outcome='failure'/>
> <notASchema filename='http://www.mit.edu/people/marc/xmlschemas/ela/1.0'/>
> <XMLMessages>
> Warning: Document has no DTD, validating abandoned
>  (detected at end of prolog of document file:///home/marc/xml/tiny.xsd)
> Error: can't retrieve "http://www.mit.edu/people/marc/xmlschemas/ela/1.0": 404 File Not Found
> </XMLMessages>
> </xsv>

The messages are obscure given the bug, but it's hard to do better.

Your schema, provided on the command line, has target namespace

   http://www.mit.edu/people/marc/xmlschemas/tiny/1.0
                                             ^^^^
Your instance has an explicit namespace

   http://www.mit.edu/people/marc/xmlschemas/ela/1.0
                                             ^^^

Since the schema does not provide declarations for the document, XSV
tries to dereference the namespace URI, resulting in the error message 
above.

Finally, it goes ahead and validates anyway, laxly (i.e. without a
type to start with), and reports no further errors.

Fix the namespace difference, and I get the following:

<xsv docElt='{http://www.mit.edu/people/marc/xmlschemas/tiny/1.0}foo' instanceAssessed='true' instanceErrors='0' rootType='string' schemaDocs='t1.xsd' schemaErrors='0' schemaLocs='' target='/projects/ltg/users/ht/xml/xmlschema/monk/t1.xml' validation='strict' version='XSV 1.173.2.6/1.82 of 2000/10/31 16:30:47' xmlns='http://www.w3.org/2000/05/xsv'/>

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 Saturday, 16 December 2000 05:45:59 GMT

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