Local Stateless Callback
The ability to invoke a service in a non-blocking fashion and receive a stateless callback over a remote binding.
1. Simple socket-based binding
This should be similar to Local stateless callback except invocations flow through references and services in a composite. As a start, we can create a simple socket-based binding that serializes Java objects
2. Use of extension bindings
Building on the first use case, we can flow invocations accross bindings handled by extensions such as Axis2 and Celtix.