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A persistence framework is middleware that assists in the storage and retrieval of information between applications and databases, especially relational databases. It acts as a layer of abstraction for persisted data, bridging conceptual and technical differences between storage and utilisation.
Many persistence frameworks are also object-relational mapping tools. Such frameworks map the objects in the application domain to data that needs to be persisted in a database. The mappings can be defined using either XML files or metadata annotations.
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