| Interface | Description | 
|---|---|
| Attachment | Message attachment | 
| Message | Abstract message representation, the default implementation is an XML based message, that can be created via XMLMessageFactory.getInstance().createMessage | 
| Payload | Message content representation | 
| Class | Description | 
|---|---|
| AttachmentFactory | Creates Attachment instances, which can be added to a Message. | 
| CallbackAddressingUtil | A Callback utility class for creating callback addressing header |