unable to redefine attributeGroups 2003-02-10 - By Eric_Schwarzenbach@(protected)
Xerces (2.3.0) doesn't seem to allow me to redefine attributeGroups. It
throws a 'derivation-ok-restriction.2.2' error.
Now maybe there's some flaw in my syntax (damned if I can find an example
of using redefine on an attributeGroup anywhere on the entire WWW!), but
the spec seems to allow it. Here's a minimal example:
Schema "a.xsd"
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault
="qualified" attributeFormDefault="unqualified">
<xs:element name="root">
<xs:annotation>
<xs:documentation>Comment describing your root
element</xs:documentation>
</xs:annotation>
<xs:complexType>
<xs:attributeGroup ref="ab"/>
</xs:complexType>
</xs:element>
<xs:attributeGroup name="ab">
<xs:attribute name="a"/>
<xs:attribute name="b"/>
</xs:attributeGroup>
</xs:schema>
Schema "b.xsd"
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault
="qualified" attributeFormDefault="unqualified">
<xs:redefine schemaLocation="a.xsd">
<xs:attributeGroup name="ab">
<xs:attribute name="a"/>
<xs:attribute name="b"/>
<xs:attribute name="c"/>
<xs:attribute name="d"/>
</xs:attributeGroup>
</xs:redefine>
<xs:element name="rut">
<xs:annotation>
<xs:documentation>Comment describing your root
element</xs:documentation>
</xs:annotation>
<xs:complexType>
<xs:attributeGroup ref="ab"/>
</xs:complexType>
</xs:element>
</xs:schema>
An xml instance "c.xml"
<?xml version="1.0" encoding="UTF-8"?>
<rut xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="b.xsd" a="Text" b="Text" c="text" d="text"/>
I get, when attempting to validate this with xerces (either DOM or SAX),
the following error:
[Error] b.xsd:5:28: src-redefine.7.2.2: attributeGroup 'ab' does not
properly restrict the attributeGroup it redefines; constraint violated:
'derivation-ok-restriction.2.2'.
I don't believe restriction (or extension) of attributeGroups is legal in
xsd. However I beleive redefinition is. Is there something silly I'm doing
or erroneous about my understanding here, or is this a bug?
I'm using Xerces 2.3.0.
Thanks,
Eric Schwarzenbach
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