/**
  * purge cache for connected articles
  *
  * @access public
  * @author Krzysztof Krzyżaniak <*****@*****.**>
  *
  */
 public function invalidateCacheConnected(BlogArticle $article)
 {
     $title = $article->getTitle();
     $title->invalidateCache();
     /**
      * this should be subpage, invalidate page as well
      */
     list($page, $subpage) = explode("/", $title->getDBkey());
     $title = Title::newFromDBkey($page);
     $title->invalidateCache();
     $article->clearBlogListing();
 }