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Add Result (Task)

addResult(ident id, ident studentId, ident taskId, double points) {
  assume exists //exams/exam[id]/results/participant[studentId]; # can also be implicitly true in an OO language
  assume exists //exams/exam[id]/tasks/task[taskId];
 
  assume not exists //exams/exam[id]/results/participant[studentId]/result[taskId];
 
  assume points >= 0 && points < //exams/exam[id]/tasks/task[taskId]/maxPoints;
 
  insert //exams/exam[id]/results/participant[studentId] <result task=[taskId] points=[points] />;
} # roles: examiner[id]