Hi everyone,
One of our users is having an issue with a unique constraint in his
schema. I've attached an example XML document and XML Schema file. Both
XML Spy and Visual Studio confirm that the XML document breaks the
uniqueness constraint, but Xerces-C does not detect this. I've tested
this and various permutations with both Xerces-C 2.8 and 3.0, and if
anything 3.0 seems more broken:
1)
<xs:unique name="vinUnique">
<xs:selector xpath="ns:car"/>
<xs:field xpath="@vin"/>
</xs:unique>
Xerces-C 2.8: Valid
Xerces-C 3.0: Valid
2)
<xs:unique name="vinUnique">
<xs:selector xpath="*:car"/>
<xs:field xpath="@vin"/>
</xs:unique>
Xerces-C 2.8: Valid
Xerces-C 3.0: Valid
3)
<xs:unique name="vinUnique">
<xs:selector xpath="ns:car/@vin"/>
<xs:field xpath="."/>
</xs:unique>
Xerces-C 2.8: "Selectors cannot select attributes"
Xerces-C 3.0: "Selectors cannot select attributes"
4)
<xs:unique name="vinUnique">
<xs:selector xpath="*:car/@vin"/>
<xs:field xpath="."/>
</xs:unique>
Xerces-C 2.8: "Duplicate unique value declared"
Xerces-C 3.0: Valid
5)
<xs:unique name="vinUnique">
<xs:selector xpath="."/>
<xs:field xpath="ns:car/@vin"/>
</xs:unique>
Xerces-C 2.8: Valid
Xerces-C 3.0: Valid
6)
<xs:unique name="vinUnique">
<xs:selector xpath="."/>
<xs:field xpath="*:car/@vin"/>
</xs:unique>
Xerces-C 2.8: "Field matches more than one value within the scope of its
selector" and "Duplicate unique value declared"
Xerces-C 3.0: Valid
As far as I can tell there seems to be at least two separate bugs here -
namespaces in the XPath selector and field aren't handled correctly, and
a separate problem with not checking unique constraints correctly.
Can anyone comment on what might be going on here?
John
--
John Snelson, Oracle Corporation http://snelson.org.uk/john
Berkeley DB XML: http://www.oracle.com/database/berkeley-db/xml
XQilla: http://xqilla.sourceforge.net
<?xml version="1.0" encoding="UTF-8"?>
<cars xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://www.example.com/4.xsd foo.xsd"
xmlns="http://www.example.com/4.xsd";>
<car vin="1"/>
<car vin="1"/>
</cars><?xml version="1.0" encoding="UTF-8"?>
<xs:schema
targetNamespace="http://www.example.com/4.xsd";
xmlns="http://www.example.com/4.xsd";
xmlns:ns="http://www.example.com/4.xsd";
xmlns:xs="http://www.w3.org/2001/XMLSchema";
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<xs:element name="cars">
<xs:complexType>
<xs:sequence maxOccurs="unbounded">
<xs:element name="car">
<xs:complexType>
<xs:attribute name="vin"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:unique name="vinUnique">
<xs:selector xpath="ns:car"/>
<xs:field xpath="@vin"/>
</xs:unique>
</xs:element>
</xs:schema>
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