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registerStudent(ident uid, ident id, ident studentId) { assume exists //exercises/exercise[id] && //exercises/exercise[id]/open && exists //accounts/account[uid]/student && //accounts/account[uid]/student/id = studentId || exists //accounts/account[uid]/assistant[id]; assume exists //exercises/exercise[id]; assume not exists //exercises/exercise[id]/students/student[studentId]; insert //exercises/exercise[id]/students <student id=[studentId] />; }