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Hi Tom. I tried to reproduce your results without success.
Given your files below, both XMLSpy 4.4 and XSV 1.4
produce errors, and I think this is correct.
Your instance document associates the prefix xlink with
urn:www.w3.org/1999/xlink, yet your schema associates
xink with http://www.w3.org/1999/xlink. The XMLSpy
error message is saying that its looking for an href
attribute in the http:... namespace but didn't find one,
as the one in the instance is associated with urn:...
XSV complains similarly, and also says that the attribute
it did find is invalid.
If I take your files and change all references
to http://www.w3.org/1999/xlink in the schemas to
urn:..., XMLSpy and XSV validate the
instance file ok.
I'm probably missing something obvious, or have
I misunderstood your concern?
> -----Original Message-----
> From: Thomas B. Passin [mailto:firstname.lastname@example.org]
> Sent: Wednesday, 24 July 2002 2:56 PM
> To: email@example.com
> Subject: Re: [xml-dev] URIs harmful (was RE: [xml-dev] Article: Keeping
> pa ce with James Clark)
> [Michael Leditschke]
> > I've used URN:... in a schema namespace in XMLSpy since
> > V3 without a problem.
> You just did not hit a winning combination. I just reconstructed the
> circumstances. I saw the problem when Schema A, a no-namespace schema,
> imports schema B, which does use a namespace. Changing the http://
> namespace to urn: causes the instance document to fail with Spy but still
> succeed with xsv. Here are three files that illustrate. They validate OK
> with both Spy 4.4 and xsv (downloaded today). Change all the xlink
> namespaces to start with "urn:" instead of "http://". Now Spy fails to
> validate while xsv still does. Spy says "Required attribute '???:href' of
> element 'base' missing".
> As I see it, this is a fairly serious bug in a generally very
> good product.
> Tom P
> Schema A:
> <xs:schema xmlns:xlink="http://www.w3.org/1999/xlink"
> <xs:import namespace="http://www.w3.org/1999/xlink"
> <xs:element name="base" type="xlink:simpleHrefType"/>
> Schema B, the imported schema:
> <xs:schema targetNamespace="http://www.w3.org/1999/xlink"
> <xs:complexType name="simpleHrefType">
> <xs:extension base="xs:anySimpleType">
> <xs:attribute name="href" type="xs:anyURI" use="required"/>
> The instance document:
> <base xmlns:xlink="urn:www.w3.org/1999/xlink"
> xlink:href="zzz" />
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