Depending on the scenarios sometimes it desirable to handle messages at the XML source level, 
either for performance or ease of development reasons. 
It is desirable to have tooling support to facilitate the generation of the code snippet using Provider and Dispatch APIs.

Use case for Client, using Dispatch API:
1.MDB gets XML message for request to get credit report from external service provider.
2.Exact same message or slightly modified message is used to invoke external service provider using Dispacth API
3.Part of or complete response message from the external Service serialized into JMS message and sent to another Queue
or Topic.

Use case for Service, using Provider API:
1. EJB Web service implemented thru Provider API gets invoked with shipment request for an item.
2. EJB WS triggers the BPEL process to start the shipment process by either send exact input XML message or slightly
modified XML source.
3. EJB may also send the message to JMS Queue for logging or auditing purposes.

In both cases additional XML to Java and Java to XML conversion is avoided.