code: def do_execute(self):
          
          result = None
          cont = self.input.payload
          serialization.write_all(
              str(self.resolve_option("output")),
              [cont.get("Model").jobject, cont.get("Header").jobject])
          return result
docs: The actual execution of the actor.
  
          :return: None if successful, otherwise error message
          :rtype: str