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# Persistent and Nonpersistent Projects

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TopLink supports projects you use for applications that require persistent storage of Java objects. For example, use a relational project to persist Java objects to a relational database, or an EIS project to persist Java objects to an EIS data source by way of a J2C adapter.

TopLink also supports projects you use for applications that require only nonpersistent (in-memory) data conversion. For example, use an XML project to perform nonpersistent (in-memory) conversion between Java objects and XML elements.