code: def query(cls, volume=None, state=None, offset=None,
                limit=None, api=None):
  
          
          api = api or cls._API
  
          if volume:
              volume = Transform.to_volume(volume)
  
          return super(Export, cls)._query(
              url=cls._URL['query'], volume=volume, state=state, offset=offset,
              limit=limit, fields='_all', api=api
          )
docs: Query (List) exports.
          :param volume: Optional volume identifier.
          :param state: Optional import sate.
          :param api: Api instance.
          :return: Collection object.