34.2. The Solution: A Persistence Service from a Persistence Framework
A persistence framework is a general-purpose, reusable, and extendable set of types that provides functionality to support persistent objects. A persistence service (or subsystem) actually provides the service, and will be created with a persistence framework. A persistence service is usually written to work with RDBs, in which case it is also called an O-R mapping service. Typically, a persistence service must translate objects into records (or some other form of structured data such as XML) and save them in a database, and translate records into objects when retrieving from a database.
In terms of the layered architecture of the NextGen application, a persistence service ...
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