code: def GetEventTagByIdentifier(self, identifier):
      
      event_tag = self._GetAttributeContainerByIndex(
          self._CONTAINER_TYPE_EVENT_TAG, identifier.row_identifier - 1)
      if event_tag:
        event_identifier = identifiers.SQLTableIdentifier(
            self._CONTAINER_TYPE_EVENT, event_tag.event_row_identifier)
        event_tag.SetEventIdentifier(event_identifier)
  
        del event_tag.event_row_identifier
  
      return event_tag
docs: Retrieves a specific event tag.
  
      Args:
        identifier (SQLTableIdentifier): event tag identifier.
  
      Returns:
        EventTag: event tag or None if not available.