If the @WebService.targetNamespace annotation is on a service endpoint interface, the targetNamespace is used
for the namespace for the wsdl:portType (and associated XML elements).
If the @WebService.targetNamespace annotation is on a service implementation bean that does NOT reference a
service endpoint interface (through the endpointInterface attribute), the targetNamespace is used for both the
wsdl:portType and the wsdl:service (and associated XML elements).
If the @WebService.targetNamespace annotation is on a service implementation bean that does reference a service
endpoint interface (through the endpointInterface attribute), the targetNamespace is used for only the
wsdl:service (and associated XML elements).