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# Relational and Nonrelational Projects

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TopLink supports both relational and nonrelational projects.

Relational projects persist Java objects to a relational database.

Nonrelational projects persist Java objects to another (nonrelational) type of data source, or perform nonpersistent (see "Persistent and Nonpersistent Projects") data conversion. For example, to persist Java objects to an EIS data source by using a J2C adapter, use an EIS project. To perform nonpersistent (in-memory) conversions between Java objects and XML elements, use an XML project.