public Parser execStatement() {
        if (execStatementParser == null) {
           FutureParser future = scoped("execStatement");
           execStatementParser = future;
           future.setParser(
               choice(
                   execSQLStatement(),
                   execCICSStatement(),
                   execDLIStatement(),
                   execHTMLStatement(),
                   execTextDataStatement()
               )
           );
        }

        return execStatementParser;
    }