private function xml() {
    	$document = new DOMDocument('1.0', 'UTF-8');
    	$document->appendChild($this->buildElement($this, $document));
    	return $document;
    }
private function xml() {
    	$document = new DOMDocument('1.0', 'UTF-8');
    	$document->appendChild($this->buildElement($this, $document));
    	return $document;
    }
private function xml ( ) { $ document = new DOMDocument ( '1.0' , 'UTF-8' ) ; $ document -> appendChild ( $ this -> buildElement ( $ this , $ document ) ) ; return $ document ; }
Build XML element.

@return DOMDocument Build TwiML element
Build XML element .