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In the Microsoft DataTypes test set, test <test group="base64Binary_enumeration003_1321" name="base64Binary_enumeration003_1321"/> the schema has <xsd:restriction base="xsd:base64Binary"> <xsd:enumeration value="MS0yLTM="/> <xsd:enumeration value="M0SyLMT="/> <xsd:enumeration value="MyS0LTM="/> </xsd:restriction> The second value is not a valid lexical representation of base64Binary: In base64, if the value ends with '=' then the last character must be one of [AEIMQUYcgkosw048]. But the metadata describes the schema as valid.
This test should indeed be invalid. This is due a bug in the packaging process of Microsoft schema tests.
WG agrees to have HT mark this test as invalid.