public function getGroupFeed($location = null)
    {
        if ($location === null) {
            $uri  = self::APPS_BASE_FEED_URI . self::APPS_GROUP_PATH . '/';
            $uri .= $this->getDomain();
        } else if ($location instanceof Zend_Gdata_Query) {
            $uri = $location->getQueryUrl();
        } else {
            $uri = $location;
        }
        return parent::getFeed($uri, 'Zend_Gdata_Gapps_GroupFeed');
    }