public function insertAlbumEntry($album, $uri = null)
    {
        if ($uri === null) {
            $uri = self::PICASA_BASE_FEED_URI . '/' .
                self::DEFAULT_PROJECTION . '/' . self::USER_PATH . '/' .
                self::DEFAULT_USER;
        }
        $newEntry = $this->insertEntry($album, $uri, 'Zend_Gdata_Photos_AlbumEntry');
        return $newEntry;
    }