public function getFontScheme($slideNumber, $storageName = '')
    {


        //Build URI to get font scheme
        $strURI = Product::$baseProductUri . '/slides/' . $this->getFileName() . '/slides/' . $slideNumber . '/theme/fontScheme';
        if ($storageName != '') {
            $strURI .= '?storage=' . $storageName;
        }
        $signedURI = Utils::sign($strURI);

        $responseStream = Utils::processCommand($signedURI, 'GET', '', '');

        $json = json_decode($responseStream);

        return $json->FontScheme;
    }