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# EIS Root Descriptors

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You can modify an EIS descriptor's behavior by configuring it as a root EIS descriptor (see "Configuring an EIS Descriptor as a Root or Composite Type"). When you designate an EIS descriptor as a root, you tell the TopLink runtime that the EIS descriptor's reference class is a parent class: no other class will reference it by way of a composite object mapping or composite collection mapping. Using an EIS root descriptor, you can configure all supported mappings. You can also configure an EIS root descriptor with EIS interactions (see "Using EIS Interactions"). However, if you configure the EIS root descriptor with a composite object mapping or composite collection mapping, the reference descriptor you define must be an EIS composite descriptor; it cannot be another EIS root descriptor.