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Test schU3 consists of a set of five schema documents with complex include/import/redefine relationships. According to the metadata it is valid. I believe that it is invalid. Module b includes module d without redefining it. This acquires a definition of attribute group c-g1. Module b also redefines module c, acquiring another definition of attribute group c-g1. I think there are therefore two conflicting definitions of this attribute group, and the schema should be rejected as invalid for this reason. (There are other conflicts as well, over complex type c-ct and element declaration c-e1).
The same arguments apply to schU4 and schU5
Agreed that this test should not be published as a compliance test. We are following up with the WG to determine the process of updating the test suite.