This topic describes working with SDO data graphs to access message data.
A message published in one format (for instance, a Web services SOAP message) may be routed to a consumer that requires another format, such as Java beans, using the Java API for XML-based RPC (JAX-RPC). Equally, the routing could be in the other direction. If the message is operated on by a mediation as it passes through the bus, in either direction, the mediation must be able to operate on the message regardless of the underlying format.
This is achieved by using a common message model for the data mediators. The model is called SDO DataGraph (see SDO data graphs) and it gives an abstract view of the message, allowing you to concentrate on the information being conveyed (such as the parameters of the request, the data of the response) without having to worry about the packaging of that information.
you can read the WebSphere Application Server information on data access with SDO in SDO view. The topic also contains a link to an introductory white paper, http://www-106.ibm.com/developerworks/java/library/j-sdo/.