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changeAttributes(ident id, ident taskId, double maxPoints) {
assume exists //exams/exam[id]/tasks/task[taskId]; # implies the existence of the exam
assume maxPoints >= 0;
assume //exams/exam[id]/results/participant[x]/result[taskId]/points < maxPoints;
update //exams/exam[id]/tasks/task[taskId]/maxPoints maxPoints;
} # roles: examiner[id]