code: def set_meta_rdf(self, rdf, fmt='n3'):
          
          evt = self._client._request_entity_meta_set(self.__lid, rdf, fmt=fmt)
          self._client._wait_and_except_if_failed(evt)
docs: Set the metadata for this Thing in RDF fmt
  
          Advanced users who want to manipulate the RDF for this Thing directly without the
          [ThingMeta](ThingMeta.m.html#IoticAgent.IOT.ThingMeta.ThingMeta) helper object
  
          Raises [IOTException](./Exceptions.m.html#IoticAgent.IOT.Exceptions.IOTException)
          containing the error if the infrastructure detects a problem
  
          Raises [LinkException](../Core/AmqpLink.m.html#IoticAgent.Core.AmqpLink.LinkException)
          if there is a communications problem between you and the infrastructure
  
          `fmt` (optional) (string) The format of RDF you have sent.
          Valid formats are: "xml", "n3", "turtle"