docs: def add_members(self, rtcs):
          '''Add other RT Components to this composite component as members.
  
          This component must be a composite component.
  
          '''
          if not self.is_composite:
              raise exceptions.NotCompositeError(self.name)
          for rtc in rtcs:
              if self.is_member(rtc):
                  raise exceptions.AlreadyInCompositionError(self.name, rtc.instance_name)
          org = self.organisations[0].obj
          org.add_members([x.object for x in rtcs])
          # Force a reparse of the member information
          self._orgs = []