code: public static RssGenerator of(String baseUrl, boolean root) {
          return new RssGenerator(baseUrl, root, null, null);
      }
docs: Helper method to create an instance of SitemapGenerator
  @param baseUrl Base URL
  @param root If Base URL is root (for example http://www.javavids.com or if
  it's some path like http://www.javalibs.com/blog)
  @return Instance of RssGenerator