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In test group "sg-and-defined-Sibling-3", the schema "wgData/sg/snbranch.xsd" is meant to test "interaction of substitution groups and #definedSibling". The only substitution group in the schema is <xsd:element name="s1" type="xsd:string" substitutionGroup="tns:s"/> But instance tests "snn1a" and "snn1c" seem to expect another substitution group: <xsd:element name="n1" type="xsd:string" substitutionGroup="tns:n"/> If "n1" does not substitute "n", then it is not excluded by the "#definedSibling" wildcard, and the schema only allows an "a" to following "n1", which means "snn1a" is valid (but it's expected to be invalid) and "snn1c" is invalid (but expected to be valid).
*** This bug has been marked as a duplicate of bug 10121 ***