25084 2014-03-17 18:16:23 +0000 cbcl-avg-010 can return NaN 2015-01-03 17:22:31 +0000 1 1 1 Unclassified XPath / XQuery / XSLT XQuery 3 & XPath 3 Test Suite Last Call drafts PC All RESOLVED FIXED P2 normal --- 1 mike oneil tim public-qt-comments oldest_to_newest 102478 0 mike 2014-03-17 18:16:23 +0000 Tes cbcl-avg-010 is: avg((xs:double("NaN"), current-date() - xs:date("1997-01-01") )) I believe that under "Errors and Optimization", NaN is a legitimate result. Once an xs:double NaN value has been found in the input sequence, the only possible outcomes are NaN or an error, so the processor is entitled to take an early bath and return NaN. 112072 1 tim 2014-09-24 11:04:54 +0000 Agreed. 116747 2 mike 2015-01-03 17:22:31 +0000 Fixed as suggested.