public Parser picture() {
        if (pictureParser == null) {
           FutureParser future = scoped("picture");
           pictureParser = future;
           future.setParser(
               sequence(
                   choice(
                       token("PIC"),
                       token("PICTURE")
                   ),
                   optional(
                       token("IS")
                   ),
                   pictureString()
               )
           );
        }

        return pictureParser;
    }