reqEnv.declareNamespace("http://soapinterop.org/", "tns");
reqEnv.declareNamespace("http://soapinterop.org/xsd", "s");
reqEnv.declareNamespace("http://www.w3.org/2001/XMLSchema-instance", "xsi");
OMElement operation = omfactory.createOMElement("echoHexBinary", "http://soapinterop.org/", null);
SOAPBody body = omfactory.createSOAPBody(reqEnv);
body.addChild(operation);
operation.addAttribute("soapenv:encodingStyle", "http://www.w3.org/2003/05/soap-encoding", null);
OMElement part = omfactory.createOMElement("inputHexBinary", "", null);
part.addAttribute("xsi:type", "xsd:hexBinary", null);