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# Understanding Projects

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A TopLink project encapsulates both mapping metadata and, where relevant, data source access information. The project is the primary object used by TopLink at run time. Each session (excluding the session broker) in a deployed application references a single project.

This chapter explains the following:

- TopLink Project Types

- Project Concepts

- Understanding the Project API

- Understanding Sequencing in Relational Projects

- Understanding XML Namespaces