reqEnv.declareNamespace("http://schemas.xmlsoap.org/soap/encoding/", "SOAP-ENC");
reqEnv.declareNamespace("http://www.w3.org/2001/XMLSchema-instance", "xsi");
reqEnv.declareNamespace("http://soapinterop.org/xsd", "s");
reqEnv.declareNamespace("http://soapinterop.org/", "m");
SOAPHeader header = omfactory.createSOAPHeader(reqEnv);
OMNamespace hns = reqEnv.declareNamespace("http://soapinterop.org/echoheader/", "hns");
SOAPHeaderBlock block1 = header.addHeaderBlock("echoMeStringRequest", hns);
block1.addAttribute("xsi:type", "xsd:string", null);
block1.addChild(omfactory.createOMText("string"));
// header.addChild(headerChild);