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addResult(ident id, ident studentId, ident sheetId, double points) { assume exists //exercises/exercise[id]/students/student[studentId]; # implies the existence of the exercise assume exists //exercises/exercise[id]/sheets/sheet[sheetId]; # dito assume not exists //exercises/exercise[id]/students/student[studentId]/result[sheetId]; assume points >= 0 && points <= //exercises/exercise[id]/sheets/sheet[sheetId]/maxPoints; insert //exercises/exercise[id]/students/student[studentId] <result sheet=[sheetId] points=[points] />; } # roles: tutor[id, groupId] <- groupId is no parameter of procedure!