code: def get_event_definition(self):
          
          messageEventDefinition = first(
              self.xpath('.//bpmn:messageEventDefinition'))
          if messageEventDefinition is not None:
              return self.get_message_event_definition(messageEventDefinition)
  
          timerEventDefinition = first(
              self.xpath('.//bpmn:timerEventDefinition'))
          if timerEventDefinition is not None:
              return self.get_timer_event_definition(timerEventDefinition)
  
          raise NotImplementedError(
              'Unsupported Intermediate Catch Event: %r', ET.tostring(self.node))
docs: Parse the event definition node, and return an instance of Event