public Parser valueClause_format1() {
        if (valueClause_format1Parser == null) {
           FutureParser future = scoped("valueClause_format1");
           valueClause_format1Parser = future;
           future.setParser(
               sequence(
                   valueClause_start(),
                   choice(
                       literal(),
                       constant()
                   )
               )
           );
        }

        return valueClause_format1Parser;
    }