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Re: xsv trouble on linux and triv.xsd: can't find address for host "foo" in http URL "http://foo/"

From: Jeni Tennison <jeni@jenitennison.com>
Date: Tue, 12 Mar 2002 18:25:50 +0000
Message-ID: <155635771691.20020312182550@jenitennison.com>
To: Simon Josefsson <simon+xmlschema-dev@josefsson.org>
CC: xmlschema-dev@w3.org
Hi Simon,

> I'm trying to get XSV (CVS HEAD) to work under linux, but it is
> giving me some problems. Running it on triv.xml + triv.xsd yields:
> [sjosefsson@sjosefsson-pc xmlschema]$ python ./applyschema.py triv.xml triv.xsd
> <?xml version='1.0'?>
> <xsv docElt='{http://foo}root' instanceAssessed='true' instanceErrors='1' schemaDocs='triv.xsd' schemaErrors='0' schemaLocs='http://foo -> triv.xsd' target='/home/sjosefsson/src/xmlschema/triv.xml'
> validation='lax' version='XSV 1.205/1.109 of 2001/10/03 21:06:42' xmlns='http://www.w3.org/2000/05/xsv'>
> <schemaDocAttempt URI='/home/sjosefsson/src/xmlschema/triv.xsd' outcome='failure' source='command line'/>
> <notASchema filename='/home/sjosefsson/src/xmlschema/triv.xsd'/>
> <schemaDocAttempt URI='/home/sjosefsson/src/xmlschema/triv.xsd' namespace='http://foo' outcome='failure' source='schemaLoc'/>
> <notASchema filename='/home/sjosefsson/src/xmlschema/triv.xsd'/>
> <schemaDocAttempt URI='http://foo/' namespace='http://foo' outcome='failure' source='docElt'>
> <notASchema filename='http://foo/'>couldn't open</notASchema>
> </schemaDocAttempt>
> <invalid char='5' code='cvc-elt.1.1' line='9' resource='file:///home/sjosefsson/src/xmlschema/triv.xml'>xsi:nil 
> specified on non-nillable element e2</invalid>
> <XMLMessages>
> Error: can't find address for host "foo" in http URL "http://foo/"
> </XMLMessages>
> </xsv>

If you look at the first couple of schemaDocAttempts, it looks as
though XSV is having problems opening triv.xsd. It only tries to find
a schema at http://foo/ because it can't use the schema that you've
provided at triv.xsd.

So my guess would be that there's something wrong with triv.xsd.
Perhaps it's not well formed, or perhaps the XML Schema namespace
isn't declared properly within it. It's hard to tell without seeing
the schema, but that's what I'd look at first. Try running XSV on
triv.xsd with the -i flag so that it checks the schema itself.

> Even running it on XMLSchema doesn't work:
> [sjosefsson@sjosefsson-pc xmlschema]$ python ./applyschema.py http://www.w3.org/2001/XMLSchema
> <?xml version='1.0'?>
> <xsv docElt='{http://www.w3.org/2001/XMLSchema}schema' instanceAssessed='true' instanceErrors='0' schemaErrors='0' target='http://www.w3.org/2001/XMLSchema' validation='lax' version='XSV
> 1.205/1.109 of 2001/10/03 21:06:42' xmlns='http://www.w3.org/2000/05/xsv'>
> <schemaDocAttempt URI='http://www.w3.org/2001/XMLSchema' namespace='http://www.w3.org/2001/XMLSchema' outcome='failure' source='docElt'/>
> <notASchema filename='http://www.w3.org/2001/XMLSchema'/>
> </xsv>

That's a different problem. XSV is trying to retrieve the schema for
schema by guessing that it's at the location specified by the
namespace URI http://www.w3.org/2001/XMLSchema. There is a RDDL
document there that refers to the schema for schema, so my guess would
be that either XSV can't use the RDDL document or it can't open the
connection to http://www.w3.org/2001/XMLSchema to retrieve the
document for some reason.



Jeni Tennison
Received on Tuesday, 12 March 2002 13:25:52 UTC

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