In the Microsoft "additional" test set, 

   <test group="addB068" name="addB068.i"/>

The metadata indicates that the instance is invalid, on the basis that a QName value exceeds the maxLength facet in the schema. However, [XML Schema Part 2, 4.3.3.3 maxLength Validation Rules, Validation Rule: maxLength Valid, rule 1.3] is explicit that the maxLength facet has no effect when used with xs:QName.