11. The computing system of claim 1 , wherein the middleware comprises a first component to extend functionality of the database engine to support the relation valued functions to integrate applications into the queries that are evaluated by the database engine.
11. The computing system of claim 1 , wherein the middleware comprises a first component to extend functionality of the database engine to support the relation valued functions to integrate applications into the queries that are evaluated by the database engine. 12. The computing system of claim 11 , wherein the middleware comprises a second component to extend functionality of the database engine to support the functional-form query that expresses the dataflow graph.