code: @Override
      public void validate(ValidationHelper helper, Context context, String key, RequestBody t) {
  
          String reference = t.getRef();
  
          if (reference != null && !reference.isEmpty()) {
              ValidatorUtils.referenceValidatorHelper(reference, t, helper, context, key);
              return;
          }
          ValidatorUtils.validateRequiredField(t.getContent(), context, "content").ifPresent(helper::addValidationEvent);
  
      }
docs: {@inheritDoc}