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# Relational Aggregate Descriptors

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An aggregate object is an object that is strictly dependent on its owning object. Aggregate descriptors do not define a table, primary key, or many of the standard descriptor options as they obtain these from their owning descriptor. If you want to configure an aggregate mapping to associate data members in a target object with fields in a source object's underlying database tables (see Configuring a Relational Aggregate Collection Mapping and Configuring a Relational Aggregate Object Mapping), you must designate the target object's descriptor as an aggregate (see "Configuring a Relational Descriptor as a Class or Aggregate Type").