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The discussion of empty least/greatest in order by's says they apply to both the empty sequence AND NaN. But the description of the Empty Order Specification in the prolog (and the "default order for empty sequences" in the static context) refers only to the empty sequence, not NaN. This seems unnecessarily inconsistent.
Thanks, Priscilla. Your comment has been accepted and the inconsistency has been corrected. Regards, Don Chamberlin (for the Query Working Group)