This page describes a minor part of the STAT System XCend Schema, namely the students who signed up for an exercise. It is therefore a part of Exercise Management and Sheets.
element student * id { [ count (./id, /account/student/id) = 1 ] attribute group ? { ident [ exists ..exercise/group[.] ]} attribute team ? { ident [ exists ../group ]} element result * sheet { [ exists ..exercise/sheet[./sheet] ] attribute points { double [ . >= 0 && . <= ..exercise/sheet[../sheet]/maxPoints ]} } }
Before a student can sign up for a group, he has to register for the exercise in general. (Which is not a student method in the current implementation.)
registerStudent(ident uid, ident id, ident studentId) { assume count (studentId, /account/student/id) = 1; assume exists /exercise[id] && /exercise[id]/open && exists /account[uid]/student && /account[uid]/student/id = studentId || exists /account[uid]/assistant[id]; assume exists /exercise[id]; assume not exists /exercise[id]/student[studentId]; insert /exercise[id] <student id=[studentId] />; }
unregisterStudent(ident uid, ident id, ident studentId) { assume exists /exercise[id] && /exercise[id]/open && exists /account[uid]/student && /account[uid]/student/id = studentId || exists /account[uid]/assistant[id]; assume exists /exercise[id]/student[studentId]; # implies the exercise exists assume size(/exercise[id]/student[studentId]/result) = 0; # don't allow unregistering if results are there assume not exists /exercise[id]/student[studentId]/group; # don't allow if signed in a group remove /exercise[id]/student[studentId]; }
One of the main things a student can do by himself, signing into and out of groups.
signUpGroup(ident uid, ident id, ident studentId, ident groupId) { assume exists /exercise[id] && /exercise[id]/open && exists /account[uid]/student && /account[uid]/student/id = studentId || exists /account[uid]/assistant[id]; assume exists /exercise[id]/student[studentId]; # implies the existence of the exercise assume exists /exercise[id]/group[groupId]; # also implies it, but once is really enough assume not exists /exercise[id]/student[studentId]/group; assume /exercise[id]/group[groupId]/curSize < /exercise[id]/group[groupId]/maxSize; insert /exercise[id]/student[studentId]/group groupId; update /exercise[id]/group[groupId]/curSize (/exercise[id]/group[groupId]/curSize + 1); }
signOutGroup(ident uid, ident id, ident studentId) { assume exists /exercise[id] && /exercise[id]/open && exists /account[uid]/student && /account[uid]/student/id = studentId || exists /account[uid]/assistant[id]; assume exists /exercise[id]/student[studentId]/group; # implies existence of the exercise and student, even the group update /exercise[id]/group[/exercise[id]/student[studentId]/group]/curSize (/exercise[id]/group[/exercise[id]/student[studentId]/group]/curSize - 1) remove /exercise[id]/student[studentId]/group; }
The tutors assign teams to the students of their groups.
assignTeam(ident uid, ident id, ident studentId, ident teamId) { assume exists /account[uid]/tutor[id]/group[/exercise[id]/student[studentId]/group]; # implies the existence of the student, the exercise, the group and enough rights by a tutor account assume not exists /exercise[id]/student[studentId]/team; insert /exercise[id]/student[studentId]/team teamId; }
leaveTeam(ident uid, ident id, ident studentId) { assume exists /account[uid]/tutor[id]/group[/exercise[id]/student[studentId]/group]; # implies the existence of the student, the exercise, the group and enough rights by a tutor account assume exists /exercise[id]/student[studentId]/team; remove /exercise[id]/student[studentId]/team; }
addResult(ident uid, ident id, ident studentId, ident sheetId, double points) { assume exists /account[uid]/assistant[id] || exists /account[uid]/tutor[id]/group[/exercise[id]/student[studentId]/group]; assume exists /exercise[id]/student[studentId]; # implies the existence of the exercise assume exists /exercise[id]/sheet[sheetId]; # dito assume not exists /exercise[id]/student[studentId]/result[sheetId]; assume points >= 0 && points <= /exercise[id]/sheet[sheetId]/maxPoints; insert /exercise[id]/student[studentId] <result sheet=[sheetId] points=[points] />; }
changeResult(ident uid, ident id, ident studentId, ident sheetId, double points) { assume exists /account[uid]/assistant[id] || exists /account[uid]/tutor[id]/group[/exercise[id]/student[studentId]/group]; assume exists /exercise[id]/student[studentId]; # implies the existence of the exercise assume exists /exercise[id]/sheet[sheetId]; # dito assume points >= 0 && points <= /exercise[id]/sheet[sheetId]/maxPoints; assume exists /exercise[id]/student[studentId]/result[sheetId]; update /exercise[id]/student[studentId]/result[sheetId]/points points; }
removeResult(ident uid, ident id, ident studentId, ident sheetId) { assume exists /account[uid]/assistant[id] || exists /account[uid]/tutor[id]/group[/exercise[id]/student[studentId]/group]; assume exists /exercise[id]/student[studentId]/result[sheetId]; # implies the existence of pretty much everything remove /exercise[id]/student[studentId]/result[sheetId]; }