public Parser passwordClause() {
        if (passwordClauseParser == null) {
           FutureParser future = scoped("passwordClause");
           passwordClauseParser = future;
           future.setParser(
               sequence(
                   token("PASSWORD"),
                   optional(
                       token("IS")
                   ),
                   dataName()
               )
           );
        }

        return passwordClauseParser;
    }