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Re: URIs harmful (was RE: Article: Keeping pa cewith

• To: xml-dev@l...
• Subject: Re: URIs harmful (was RE: Article: Keeping pa cewith James Clark)
• From: "Thomas B. Passin" <tpassin@c...>
• Date: Wed, 24 Jul 2002 00:56:10 -0400
• References: <LOBBICBLDJIJHPNJFPOLCEKHCJAA.mike@a...>

[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"
xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:import namespace="http://www.w3.org/1999/xlink"
    schemaLocation="xlink3.xsd"/>
<xs:element name="base" type="xlink:simpleHrefType"/>
</xs:schema>

Schema B, the imported schema:

<xs:schema targetNamespace="http://www.w3.org/1999/xlink"
     xmlns:xs="http://www.w3.org/2001/XMLSchema"
    attributeFormDefault="qualified">
 <xs:complexType name="simpleHrefType">
  <xs:simpleContent>
   <xs:extension base="xs:anySimpleType">
    <xs:attribute name="href" type="xs:anyURI" use="required"/>
   </xs:extension>
  </xs:simpleContent>
 </xs:complexType>
</xs:schema>

The instance document:

<base xmlns:xlink="urn:www.w3.org/1999/xlink"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:noNamespaceSchemaLocation="base1.xsd"
 xlink:href="zzz" />

• Follow-Ups:
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    • From: "Michael Leditschke" <mike@a...>

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  • RE: URIs harmful (was RE: Article: Keeping pa ce with James Clark)
    • From: "Michael Leditschke" <mike@a...>

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