OMNamespace ns = fac.createOMNamespace(XKMS2Constants.XKMS2_NS, "");
OMNamespace emptyNs = fac.createOMNamespace("", "");
OMElement locateRequestEle = fac.createOMElement("LocateRequest", ns);
locateRequestEle.declareNamespace(Constants.SignatureSpecNS, "ds");
locateRequestEle.declareNamespace("http://www.w3.org/2001/04/xmlenc#", "xenc");
locateRequestEle.addAttribute("Id", "I045c66f6c525a9bf3842ecd3466cd422", emptyNs);
locateRequestEle.addAttribute("Service", "http://www.example.org/XKMS", emptyNs);
OMElement respondWithEle = fac.createOMElement("RespondWith", ns);
respondWithEle.setText(RespondWith.KEY_VALUE.getAnyURI());