code: def get_all_events(self):
          
          self.all_events = {}
          events = self.tree.findall('EVENT')
          events += self.tree.findall('CC')
          for e in events:
              event_id = e.attrib['id']
              if event_id in self._static_events:
                  continue
              event_type = e.find('type').text
              try:
                  self.all_events[event_type].append(event_id)
              except KeyError:
                  self.all_events[event_type] = [event_id]
docs: Make a list of all events in the TRIPS EKB.
  
          The events are stored in self.all_events.