Rule(s): Rules specify the effects of the execution of an
action. They modify the objects attributes that participated in
the action. Each rule identifies the time of its execution, which
can be: trigger, destroyer, or continuous. Trigger rules will be
executed at the time the action is triggered. Destroyer rules will
be executed when the action is destroyed. Continuous rules, on
the other hand, will be fired every clock tick, representing
continuous behaviors of the model. Rules also specify the order
they will be executed through the “priority” parameter.