Specifies a valid URL pointing to a final WSDL document. If not specified, the WSDL document associated with the service-ref in the standard J2EE deployment descriptor is used.
service-ref (sun-web.xml, sun-ejb-jar.xml, sun-application-client.xml)
none - contains data
// available via HTTP <wsdl-override>http://localhost:8000/myservice/myport?WSDL</wsdl-override>
// in a file <wsdl-override>file:/home/user1/myfinalwsdl.wsdl</wsdl-override>