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# Configuring Reference Descriptors

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In EIS mappings that extend `oracle.toplink.mappings.ForeignReferenceMapping` or `oracle.toplink.mappings.AggregateMapping` class, attributes reference other TopLink descriptors–not the data source. You can select a descriptor in the current project, or a descriptor from some other project.

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

Mapping Support for Reference Descriptor

Mapping | Using TopLink Workbench | Using Java
--- | --- | ---
EIS Direct Mapping |  |
EIS Composite Direct Collection Mapping |  |
EIS One-to-One Mapping |  |
EIS One-to-Many Mapping |  |
EIS Composite Object Mapping |  |
EIS Composite Collection Mapping |  |
EIS Transformation Mapping |  |