RDB DAS provides a generic data access service that provides transformation capability between SDO data graphs and relational databases and vise versa.

The following diagram illustrates these two capabilities in a typical client interaction.The client starts by reading a graph of data specified by some query.The client then makes modifications to the graph, possibly by adding elements, and then requests the DAS to push the changes back to the database.

The following diagram illustrates the high level object diagram for DAS

To further explore the benefits of DAS please refer to white paper "DAS White Paper: The Data Access Service" on the Documentation page.

Below, there is a list of various links to documents that help to explain various aspects of the Tuscany DAS subproject and the programming model that it provides. More general documentation which applies to the Tuscany project as a whole can be found on the Tuscany Documentation page.

Title	Description
DAS White Paper: The Data Access Service	How to access relational data in terms of Service Data Objects (not yet on the website - to be provided)