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# EIS Composite Descriptors

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By default, when you add a class to an EIS project (see "Configuring Project Classpath"), TopLink Workbench creates an EIS descriptor for the class, and designates the EIS descriptor as a composite. When you designate an EIS descriptor as a composite, you tell the TopLink runtime that the EIS descriptor's reference class may be referenced by a composite object mapping or composite collection mapping. Using an EIS composite descriptor, you can configure all supported mappings. However, you cannot configure an EIS composite descriptor with EIS interactions: for this, you need an EIS root descriptor (see "EIS Root Descriptors").