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Since data is rarely in a form required by applications and services, and is often not even in a single data source, a key requirement for data services is that they abstract the data from its physical persistence structure, presenting it in a form that is closer to the needs of the using application. This effectively decouples consuming applications from the structure of the underlying data.

Hand-in-hand with abstraction, a federated query engine is required to execute the transformations defining the abstraction layers in an efficient manner, and to expose the abstracted structures through uniform and standard APIs.