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changeAttributes(ident uid, ident id, string title, string date, string time, string location) { assume exists //accounts/account[uid]/admin || exists //accounts/account[uid]/examiner[id]; assume exists //exams/exam[id]; # implicitly true in OO implementations update //exams/exam[id]/title title; update //exams/exam[id]/date date; update //exams/exam[id]/time time; update //exams/exam[id]/location location; }