* @param features features (feature sub-parameters)
* @param language (may be null or empty, which is treated as null)
* @param country (may be null or empty, which is treated as null)
*/
public PageNumberGenerator ( String format, int groupingSeparator, int groupingSize, int letterValue, String features, String language, String country ) {
this.converter = new NumberConverter ( format, groupingSeparator, groupingSize, letterValue, features, language, country );
}