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The schema files books.xsd and books2.xsd in TestSource directory contain the following import: <xs:import namespace="http://www.w3.org/XML/1998/namespace"/> The XQTS does not include a schema file with the definition of the "http://www.w3.org/XML/1998/namespace" target namespace. There is at least one test XQuery/ValLax/vallax-ins-005, on which the result depends on the definition of ID global attribute defined in the above namespace. Neither guidelines or the XQUTSCatalog.xml defines a location for the definition of the mentioned target namespace.
I've added a schemaLocation giving the location of a schema document for the XML namespace for the benefit of schema processors that don't have in-built knowledge of where to find it, or have the relevant components built in. I'm slightly surprised to find that there are schema processors that need to be given this information.