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In the Microsoft "schema" test set, test <test group="schZ012_a" name="schZ012_a"/> the schema document includes itself, but using a different URI that refers to the same resource (a case variant of itself). For a start, this relies on a platform where case in filenames is not significant. Secondly, it requires special treatment of URIs that's outside the scope of the spec. If the equivalence of schZ012_a and schZ012_A is not recognized by the processor, it will load two copies of the schema document, and report failures due to the existence of two element declarations with the same name.
Agreed that this test should not be published as a compliance test.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.
Another implDep ?
WG voted to mark this item as implementation dependent, and put in the prose in the metadata that it's implDep because the spec is underspecified.