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Add Student ID

addStudentId(ident uid, ident username, string id) {
  assume exists //accounts/account[uid]/admin;
 
  assume exists //accounts/account[username]; # implicitly true in OO implementations
  assume not exists //accounts/account[username]/student;
  assume count(id, //accounts/account/student/id) = 0;
 
  insert //accounts/account[username] <student id=[id] />;
}