public Parser monoElemPrimaryCondition() {
        if (monoElemPrimaryConditionParser == null) {
           FutureParser future = scoped("monoElemPrimaryCondition");
           monoElemPrimaryConditionParser = future;
           future.setParser(
               sequence(
                   optional(
                       token("IS")
                   ),
                   choice(
                       conditionName(),
                       className()
                   )
               )
           );
        }

        return monoElemPrimaryConditionParser;
    }