Method render

/**
 * Outputs the document
 *
 * @param   boolean  $cache   If true, cache the output
 * @param   array    $params  Associative array of attributes
 *
 * @return  string  The rendered data
 *
 * @since   1.7.0
 */
public function render($cache = false, $params = array())
{
    $app = CmsFactory::getApplication();
    if ($mdate = $this->getModifiedDate()) {
        if (!$mdate instanceof Date) {
            $mdate = new Date($mdate);
        }
        $app->modifiedDate = $mdate;
    }
    $app->mimeType = $this->_mime;
    $app->charSet = $this->_charset;
    // Handle preloading for configured assets in web applications
    if ($app instanceof AbstractWebApplication) {
        $this->preloadAssets();
    }
    return '';
}