public Parser propertySpecifier() {
        if (propertySpecifierParser == null) {
           FutureParser future = scoped("propertySpecifier");
           propertySpecifierParser = future;
           future.setParser(
               sequence(
                   token("PROPERTY"),
                   propertyName(),
                   optional(
                       sequence(
                           token("AS"),
                           literal()
                       )
                   )
               )
           );
        }

        return propertySpecifierParser;
    }