public function getTextItems()
    {
        $parameters = func_get_args();
        //set parameter values
        if (count($parameters) > 0) {
            $worksheetName = $parameters[0];
        }
        $strURI = Product::$baseProductUri . '/cells/' . $this->getFileName() . ((isset($parameters[0])) ? '/worksheets/' . $worksheetName . '/textItems' : '/textItems');
        $signedURI = Utils::sign($strURI);
        $responseStream = Utils::processCommand($signedURI, 'GET', '', '');
        $json = json_decode($responseStream);
        return $json->TextItems->TextItemList;
    }