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# Understanding Object Persistence

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This section includes a brief description of relational mapping and provides important information and restrictions to guide object and relational modeling. This information is useful when building TopLink applications.

This section includes information on the following:

- Application Object Model

- Data Storage Schema

- Primary Keys and Object Identity

- Mappings

- Foreign Keys and Object Relationships

- Inheritance

- Concurrency

- Caching

- Nonintrusive Persistence

- Indirection

These sections contain additional detail on these features, and explain how to implement and use them with TopLink.