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In the Microsoft Wildcard test set, test group wildZ010 uses a schema containing <xsd:any namespace="" processContents="strict"/> My reading of the specification is that this represents a wildcard whose {namespace constraint} is an empty set of namespaces, and which therefore cannot be matched by any element. It follows that the instance document wildZ010.xml is invalid, yet the test metadata describes it as valid.
A namespace attribute on a wildcard without a value is not of much use, the Microsoft test interprets it the same as as not having the namespace attribute at all and default it to ##any.
Agreed that the spec is clear that this wildcard matches nothing, and the instance is therefore invalid. The test will be changed accordingly.