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Service Data Objects simplify and unify Service Oriented Architecture data access and code in a heterogeneous environment. The SDO API concepts are programming language neutral. Specifications for Java and C++ SDO can be found at the Open Service Oriented Architecture website. Within Tuscany it is being implemented in Java and in C++. A PHP version of SDO is available for download from the PHP Extensions Community Library (PECL). Implementations for other languages have been mooted, e.g. Ruby.

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Data Access Services (DAS) access data sources and produce data graphs. Modifications made to graphs by the application are summarized in the graph structure, and the a DAS can use this change summary to update the original data source.