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# Configuring Reference Descriptor

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In relational mappings that extend `oracle.toplink.mappings.ForeignReferenceMapping`, attributes reference other TopLink descriptors–not the data source. You can select any descriptor in the project.

Table: Relational Mapping Support for Reference Descriptor summarizes which relational mappings support this option.

Relational Mapping Support for Reference Descriptor

Mapping | Using TopLink Workbench | Using Java
--- | --- | ---
One-to-One Mapping |  |
Variable One-to-One Mapping |  |
One-to-Many Mapping |  |
Many-to-Many Mapping |  |
Aggregate Collection Mapping |  |
Aggregate Object Mapping |  |