private function serializeAbstractRequest(DOMElement $element, AbstractRequest $request) { $element->appendChild(new DOMElement("createDateTimestamp", $request->getCreateDateTimestamp()->format("Y-m-d\\TH:i:s\\Z"))); $element->setAttribute("version", $request->getVersion()); $element->setAttribute("xmlns", "http://www.idealdesk.com/ideal/messages/mer-acq/3.3.1"); }