@staticmethod
def is_multizone_reader():
    """Can this reader read bundles which contain more zones?.

        This implementation returns always True.
        If a subclass supports just one zone in file (e.g. `read.Sentences`),
        this method should be overriden to return False, so `process_document`
        can take advatage of this knowledge and optimize the reading
        (no buffer needed even if `bundles_per_doc` specified).
        """
    return True
