This is an old revision of the document!
signUpGroup(ident uid, ident id, ident studentId, ident groupId) { assume exists //accounts/account[uid]/assistant[id] || //accounts/account[uid]/student/id = studentId; assume exists //exercises/exercise[id]/students/student[studentId]; # implies the existence of the exercise assume exists //exercises/exercise[id]/groups/group[groupId]; # also implies it, but once is really enough assume not exists //exercises/exercise[id]/students/student[studentId]/group; assume //exercises/exercise[id]/groups/group[groupId]/curSize < //exercises/exercise[id]/groups/group[groupId]/maxSize; insert //exercises/exercise[id]/students/student[studentId]/group groupId; update //exercises/exercise[id]/groups/group[groupId]/curSize (//exercises/exercise[id]/groups/group[groupId]/curSize + 1); }