register_driver (&options, "%s.csv", output_base);
register_driver (&options, "%s.odt", output_base);
register_driver (&options, "%s.spv", output_base);
register_driver (&options, "%s.csv", output_base);
register_driver (&options, "%s.odt", output_base);
register_driver (&options, "%s.spv", output_base);