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addParticipant(ident uid, ident id, ident studentId) { assume exists //exams/exam[id]/free && exists //accounts/account[uid]/student && //accounts/account[uid]/student/id = studentId || exists //accounts/account[uid]/examiner[id]; assume exists //exams/exam[id]; # implicitly true in OO implementations assume exists //accounts/account/student[studentId]; assume not exists //exams/exam[id]/results/participant[studentId]; insert //exams/exam[id]/results/participant[studentId]; }