/**
  * Marshall a ModalFeedbackRule object to its XML counterpart.
  *
  * @param \qtism\data\QtiComponent $component
  * @return \DOMElement
  */
 public function marshall(QtiComponent $component)
 {
     $element = self::getDOMCradle()->createElement('modalFeedbackRule');
     self::setDOMElementAttribute($element, 'outcomeIdentifier', $component->getOutcomeIdentifier());
     self::setDOMElementAttribute($element, 'showHide', ShowHide::getNameByConstant($component->getShowHide()));
     self::setDOMElementAttribute($element, 'identifier', $component->getIdentifier());
     if ($component->hasTitle() === true) {
         self::setDOMElementAttribute($element, 'title', $component->getTitle());
     }
     return $element;
 }
 protected function marshallChildrenKnown(QtiComponent $component, array $elements)
 {
     $element = self::getDOMCradle()->createElement($component->getQtiClassName());
     self::setDOMElementAttribute($element, 'outcomeIdentifier', $component->getOutcomeIdentifier());
     self::setDOMElementAttribute($element, 'identifier', $component->getIdentifier());
     self::setDOMElementAttribute($element, 'showHide', ShowHide::getNameByConstant($component->getShowHide()));
     if ($component->hasTitle() === true) {
         self::setDOMElementAttribute($element, 'title', $component->getTitle());
     }
     foreach ($elements as $e) {
         $element->appendChild($e);
     }
     return $element;
 }