rule "Overlapping meetings"
    when
        MeetingParametrization($weight: overlappingMeetings != 0)
        $leftAssignment : MeetingAssignment(startingTimeGrain != null)
        $rightAssignment : MeetingAssignment(startingTimeGrain != null, meeting.getId() < $leftAssignment.getMeeting().getId(),
            meeting != $leftAssignment.getMeeting())
    then
        if ($leftAssignment.calculateOverlap($rightAssignment) != 0) {
            scoreHolder.addSoftConstraintMatch(kcontext, - $weight);
        }
end