[F&O] IBM-FO-033: Invalid function signatures

(IBM-FO-033): Sections 10.2.4 (fn:get-namespace-uri-for-prefix) and 10.2.5 
(fn:get-in-scope-prefixes): Both of these functions have signatures 
containing types that are not valid SequenceTypes ("element" should be 
element()".)

--Don Chamberlin