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All of the tests in the FunctX group appear to declare the functx namespace prefix to be "http://www.functx.com". Some use this prefix and many do not. Our guidelines for both the writing of test cases and the writing of our specifications call for the use of www.example.com.
Should be fixed, let me know if I've missed some. There are some references to funct.com, but that's related to bug 5685.