protected function _getTags(\Zend_EventManager_EventDescription $event)
    {
        $params = $event->getParams();

        $tags = array($this->_getClassName($event->getTarget()));

        if(isset($params['tags'])) {
            if(is_array($params['tags'])) {
                $tags = array_merge($tags, $params['tags']);
            } else {
                $tags[] = $params['tags'];
            }
        }
        
        foreach ($tags as &$tag) {
            $tag = $this->_normalizeName($tag);
        }

        return $tags;
    }