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<title>Description of the illustration override_tl.gif</title>
<p>This illustration shows how the EclipseLink JPA overriding mechanism works in the case of usage of <code>eclipselink.sessions-xml</code> persistence unit property: This defines a <code>sessions.xml</code> file, which references a <code>project.xml</code> file. In this case, the EclipseLink persistence provider builds an in-memory EclipseLink session and project based on this metadata.</p>