code: def Copy(self, field_number=None):
      
      new_args = self._kwargs.copy()
      if field_number is not None:
        new_args["field_number"] = field_number
  
      return ProtoRDFValue(
          rdf_type=self.original_proto_type_name,
          default=getattr(self, "default", None),
          **new_args)
docs: Returns descriptor copy, optionally changing field number.