Unless I'm mistaken, the query for test


   <test-case name="fn-nilled-48">
      <description> If node is nilled, it does not match element(E, T)</description>
      <created by="Michael Kay" on="2012-10-17"/>
      <environment ref="nillable-Q"/>
      <dependency type="spec" value="XQ10+"/>
      <dependency type="feature" value="schemaImport"/>
      <test>
        import schema namespace ids="http://www.w3.org/XQueryTest/nillable";
      	/root/branch/date instance of element(*, ids:date)
      </test>
      <result>
         <assert-false/>
      </result>
   </test-case>

isn't testing the intent of the test.  

/root will match the empty sequence.

It should be

/ids:root

etc.

as in fn-nilled-41.

I suspect other tests in this set have a similar problem.