Returns the ids of the containing elements that interrupt the event scope (e.g. interrupting
event subprocesses). An interrupted event scope can not be triggered by other interrupting or
non-interrupting events. But the event scope can still be triggered by boundary events.
Returns the ids of the boundary events. An interrupting boundary event must return its id also
with getInterruptingElementIds(). Otherwise, it is handled as non-interrupting
boundary event.