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revokeTutorRights(ident uid, ident username, ident exerciseId, ident groupId) { assume exists //accounts/account[uid]/assistant[exerciseId]; assume exists //accounts/account[username]/tutor[exerciseId]/group[groupId]; assume exists //exercises/exercise[exerciseId]/groups/group[groupId]/tutor[username]; # implied by integrity and the assumption before remove //accounts/account[username]/tutor[exerciseId]/group[groupId]; if size(//accounts/account[username]/tutor[exerciseId]/group) = 0 then # should this be an additional procedure? remove //accounts/account[username]/tutor[exerciseId]; fi remove //exercises/exercise[exerciseId]/groups/group[groupId]/tutor[username]; }