code: public static Options fromStream(final String globalPrefix,
                                     final String appPrefix,
                                     final String outerTagName,
                                     final InputStream is) throws OptionsException {
      Options opts = new Options();
  
      opts.init(globalPrefix, appPrefix, is, outerTagName);
  
      return opts;
    }
docs: Return an object that uses a local set of options parsed from the input stream.
  
  @param globalPrefix
  @param appPrefix
  @param outerTagName
  @param is
  @return CalOptions
  @throws OptionsException