public function process( $text, $createRootNode = true )
    {
        $text = preg_replace( '#<!--.*?-->#s', '', $text ); // remove HTML comments
        $text = str_replace( array( '&nbsp;', '&#160;', '&#xa0;' ), "\xC2\xA0", $text );
        return parent::process( $text, $createRootNode );
    }