The ExternalCallbackTarget interface is a marker interface that should be
placed on any control implementation (JCS) class that can be the target
of an asynchronous external callback.
This annotation provides the ability to
override the default queue name for the
callback jws for the service control
callback endpoint
This annotation can be added manually to the service control
and modified on the service control.
The EndpointMethdodName annotation is only used when the JaxRpc Service Endpoint Interface method
does not match the method name on the service control.