def is_using_format(cls, markers, used_formats=None):
        """
        Args:
            markers (str | unicode): Space separated list of markers to look for
            used_formats (str | unicode): Formats to consider (default: cls.used_formats)

        Returns:
            (bool): True if any one of the 'markers' is seen in 'used_formats'
        """
        if used_formats is None:
            used_formats = cls.used_formats
        if not markers or not used_formats:
            return False
        return any(marker in used_formats for marker in flattened(markers, split=(" ", UNIQUE)))