Abstract. Object-oriented application development often involves storing application objects in a relational database. Sometimes it is desirable to develop the persistent classes and the relational database in an independent way, and to use an object persistent manager to connect them in a suitable way. This paper introduces M 2 ORM 2 , a model for describing meet-in-the-middle mappings between object schemas and relational schemas, to support the transparent management of object persistence by means of relational databases.

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