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https://issues.apache.org/jira/browse/XERCESC-1393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alberto Massari resolved XERCESC-1393.
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Resolution: Fixed
Fix Version/s: 3.0.0
Assignee: Alberto Massari
Comparison between two xs:anySimpleType is done by comparing their lexical
values
> Identity constraint is not enforced on xs:anySimpleType
> -------------------------------------------------------
>
> Key: XERCESC-1393
> URL: https://issues.apache.org/jira/browse/XERCESC-1393
> Project: Xerces-C++
> Issue Type: Bug
> Components: Validating Parser (XML Schema)
> Affects Versions: 2.6.0
> Environment: Windows XP SP2, Visual C++ 6.0
> Reporter: Alberto Massari
> Assignee: Alberto Massari
> Fix For: 3.0.0
>
>
> I have this schema file
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
> elementFormDefault="qualified">
> <xs:element name="Songs">
> <xs:complexType>
> <xs:sequence>
> <xs:element name="Song" maxOccurs="unbounded">
> <xs:complexType>
> <xs:attribute name="title" use="required"/>
> </xs:complexType>
> </xs:element>
> </xs:sequence>
> </xs:complexType>
> <xs:unique name="Song">
> <xs:selector xpath="Song"/>
> <xs:field xpath="@title"/>
> </xs:unique>
> </xs:element>
> </xs:schema>
> It defines a root named "Songs" with child nodes named "Song" having one
> attribute, with no type specified (so, it is assumed to be xs:anySimpleType).
> It also defines a uniqueness constraint to avoid having two "Song" element
> with the same title.
> I also have an XML associated with this schema,
> <Songs xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xsi:noNamespaceSchemaLocation="xsd_unique.xsd">
> <Song title="Hotel California"/>
> <Song title="Hotel California"/>
> </Songs>
> that lists the same song twice.
> However, running "Saxcount -n -s xsd_unique.xml" on the XML file result in no
> validation errors being reported.
> But changing the schema to say
> <xs:attribute name="title" type="xs:string" use="required"/>
> makes the validator report "Duplicate unique value declared for identity
> constraint of element 'Songs'."
> The cause of the error is in
> inline int AnySimpleTypeDatatypeValidator::compare(const XMLCh* const,
> const XMLCh* const
> , MemoryManager* const)
> {
> return -1;
> }
> that always report two instances of xs:anySimpleType to be different,
> regardless of their values.
> Strictly speaking, this is not an error, as the XMLSchema specs say (§
> 2.2.1.2, Simple Type Definition):
> "The mapping from lexical space to value space is unspecified for items whose
> type definition is the ·simple ur-type definition·. Accordingly this
> specification does not constrain processors' behaviour in areas where this
> mapping is implicated, for example [...] checking identity constraints
> involving such items.
> Note: The Working Group expects to return to this area in a future version of
> this specification."
> Anyhow, this causes confusion in the users (because Xerces-J reports the
> error, for instance) so I would like to do one (or both) of the following
> changes:
> 1) implement the "compare" operation to do a lexical space comparation (i.e.
> using XMLString::equals)
> 2) emit a warning when an identity field involves a xs:anySimpleType
> Feedback?
> Alberto
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