+ private static final SubstatementValidator SUBSTATEMENT_VALIDATOR = SubstatementValidator.builder(Rfc6020Mapping
+ .MUST)
+ .add(Rfc6020Mapping.DESCRIPTION, 0, 1)
+ .add(Rfc6020Mapping.ERROR_APP_TAG, 0, 1)
+ .add(Rfc6020Mapping.ERROR_MESSAGE, 0, 1)
+ .add(Rfc6020Mapping.REFERENCE, 0, 1)
+ .build();