code: def organisation_group_id(self):
          
          self._validate()
          self._validate_for_organisation_group_id()
  
          parts = []
          parts.append(self.election_type)
          if self.subtype:
              parts.append(self.subtype)
          parts.append(self.organisation)
          parts.append(self.date)
          return ".".join(parts)
docs: str: Organisation Group ID