Implementation of AnyParser API

def _parse_multifile(self, desired_type: Type[T], obj: PersistedObject,
                         parsing_plan_for_children: Dict[str, AnyParser._RecursiveParsingPlan],
                         logger: Logger, options: Dict[str, Dict[str, Any]]) -> T:
        """
        Implementation of AnyParser API
        """
        raise Exception('This should never happen, since this parser relies on underlying parsers')