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The query for K2-Steps-14 is: <r> { let $i := <e> <a/> <b/> </e> let $b := ($i/b, $i/a, $i/b, $i/a) return ()/$b } </r> The expected result for this query is <r><a/><b/></r>. I believe that ()/$b should produce (), and so I believe that the expected result should be <r/>.
Yes, another nearby test had a similar error. A fix has been attempted in CVS, XQTS_current.zip is updated.