code: def load_record_config(self, file_id):
          
          if file_id not in self._record_configs:
              self._record_configs[file_id] = self._reader.read_config_file(
                  'record_config_%s.cml' % file_id)
  
          return self._record_configs[file_id]
docs: Loads the configuration fields file for the id.
  
          :param file_id: the id for the field
          :return: the fields configuration