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"Windowing" use cases Q3, Q8, Q9, Q14, Q15, Q16, and Q19 all query documents that declare the xsi prefix and return some elements from these documents. The expected results for these queries do not contain a declaration for xsi. I suggest either removing the declaration from the input documents or adding then to the expected results.
I confirmed the problem for all queries mentioned in the bug by running each of them using the latest version of Zorba.