/**
  * Adds all elements of the other collection to this collection.
  *
  * @param object $otherCollection
  * @todo Impl
  * @override
  */
 public function addAll($otherCollection)
 {
     parent::addAll($otherCollection);
     //...
     //TODO: Register collection as dirty with the UoW if necessary
     //$this->_changed();
 }