/**
  * Returns the cache key parts for this product group
  * 
  * @return string
  *
  * @author Sebastian Diel <*****@*****.**>
  * @since 23.11.2012
  */
 public function CacheKeyParts()
 {
     if (is_null($this->cacheKeyParts)) {
         parent::CacheKeyParts();
         $this->cacheKeyParts[] = sha1($this->getSearchQuery()) . md5($this->getSearchQuery());
     }
     return $this->cacheKeyParts;
 }