+ private static final SubstatementValidator SUBSTATEMENT_VALIDATOR = SubstatementValidator.builder(Rfc6020Mapping
+ .USES)
+ .add(Rfc6020Mapping.AUGMENT, 0, MAX)
+ .add(Rfc6020Mapping.DESCRIPTION, 0, 1)
+ .add(Rfc6020Mapping.IF_FEATURE, 0, MAX)
+ .add(Rfc6020Mapping.REFINE, 0, MAX)
+ .add(Rfc6020Mapping.REFERENCE, 0, 1)
+ .add(Rfc6020Mapping.STATUS, 0, 1)
+ .add(Rfc6020Mapping.WHEN, 0, 1)
+ .build();