def get_id(self, version: int) -> str:
    if (version == 1):
        raise NoOldIdError()
    else:
        return ('li' + self.identifier.get_id(version))
def get_id(self, version: int) -> str:
    if (version == 1):
        raise NoOldIdError()
    else:
        return ('li' + self.identifier.get_id(version))