reqEnv.declareNamespace("http://schemas.xmlsoap.org/soap/envelope/", "soapenv");
reqEnv.declareNamespace("http://www.w3.org/2001/XMLSchema", "xsd");
reqEnv.declareNamespace("http://schemas.xmlsoap.org/soap/encoding/",
"SOAP-ENC"); //xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"
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"); //xmlns:m0="http://soapinterop.org/echoheader/