Inheritance: extends Value
 /**
  * @see DataValue::parseUserValue
  *
  * @param string $value
  */
 protected function parseUserValue($userValue)
 {
     if (!$this->isEnabledFeature(SMW_DV_PVUC)) {
         $this->addErrorMsg(array('smw-datavalue-feature-not-supported', 'SMW_DV_PVUC'));
     }
     parent::parseUserValue($userValue);
 }