public IList <IFormat> SelectFormats(string format_spec, string mergeOutputFormat = null) => FormatParser.SelectFormats(Items, format_spec, mergeOutputFormat);
public static IList <IFormat> SelectFormats(this IList <IFormat> formats, string format_spec, string mergeOutputFormat = null) => FormatParser.SelectFormats(formats, format_spec, mergeOutputFormat);