reqEnv.declareNamespace("http://schemas.xmlsoap.org/wsdl/", "wsdl");
reqEnv.declareNamespace("http://soapinterop.org/WSDLInteropTestRpcEnc", "tns");
reqEnv.declareNamespace("http://www.w3.org/2001/XMLSchema-instance","xsi");
OMElement operation = omfactory.createOMElement("echoStringArray", "http://soapinterop.org/WSDLInteropTestRpcEnc", null);
SOAPBody body = omfactory.createSOAPBody(reqEnv);
body.addChild(operation);
operation.addAttribute("soapenv:encodingStyle", "http://schemas.xmlsoap.org/soap/encoding/", null);
OMElement part = omfactory.createOMElement("param0", "", null);
part.addAttribute("xsi:type", "SOAP-ENC:Array", null);