cal value to the Bean
            Validation API. The validationGroups attribute serves as a
            filter that instructs the Bean Validation API which
            contraints to enforce. If there are any constraint
            violations reported by Bean Validation, the value is
            considered invalid.  <span class="changed_added_2_3">An
            instance of this validator can participate in class-level
            validation provided the preconditions mentioned in
            <code>&lt;f:va