private function addExternalLink($externallinks)
 {
     $unique_externallinks = array_unique(array_map('trim', explode(';', $externallinks)));
     foreach ($unique_externallinks as $externallink) {
         $prefix = substr($externallink, 0, strpos($externallink, "://"));
         if ($prefix != "http" && $prefix != "https") {
             $externallink = "http://" . $externallink;
         }
         $ext = new ExtLinks();
         $ext->setUrl($externallink);
         $ext->setComment('Record web address');
         $this->staging->addRelated($ext);
     }
 }