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Given the resolution of <https://www.w3.org/Bugs/Public/show_bug.cgi?id=21370>, the expected result of format-dateTime-011 is wrong. Specifically, "0" can not be an expected value for a week number since week numbers are in the range [1,5]. Every expected week number of "0" should be a "5", i.e., the 5th week of the previous month.
Fixed as suggested.