There is nothing in JPA that specifies the meta-data model used by an Implementation. Each implementation will use their own model. In TopLink Essentials you can gain access to the meta-data through casting to the TopLink EntityManager implementation, getting the Session and then getting the Project from the session. In TopLink the Project is the root object in the meta-data tree.
((oracle.toplink.essentials.ejb.cmp3.EntityManager)em).getSession().getProject()
--Gordon
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