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# Sessions and Sequencing

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An essential part of maintaining object identity is managing the assignment of unique values to distinguish one instance from another. For more information, see "Projects and Sequencing".

Sequencing options you configure in a `sessions.xml` (or `project.xml`) file determine the type of sequencing that TopLink uses.

In a CMP project, you do not configure a `sessions.xml` file directly: in this case you must configure the sequence type in the `project.xml` file (see "Configuring Sequencing at the Project Level").

In a non-CMP project, you can use session-level sequence configuration to override project-level sequence configuration, on a session-by-session basis, if required (see "Configuring Sequencing at the Session Level").

After configuring the sequence type at the session (or project) level, for each descriptor you must also configure sequencing options for that descriptor to use sequencing (see "Descriptors and Sequencing").