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This is catalogued as expecting error XPTY0004 but it is now a legal query. Similarly fn-months-from-duration-20 fn-days-from-duration-20 fn-hours-from-duration-20 fn-minutes-from-duration-20 fn-seconds-from-duration-20 (I'm afraid I can't seem to find the bugzilla for the spec change that makes these queries legal - I'm relying on memory)
The Bugzilla entry your were looking for is http://www.w3.org/Bugs/Public/show_bug.cgi?id=2944.
Michael: The tests are now of type "standard". Resubmitted the expected results. in the case of fn-seconds-from-duration-20, changed the query to include seconds. Changed the catalog file to reflect these changes. Please close the bug if in agreement. Thanks, Carmelo