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# Aggregate and Composite Descriptors and Inheritance

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You can designate relational descriptors as aggregates, and EIS descriptors as composites. XML descriptors are always composites (see "Descriptors and Aggregation").

When configuring inheritance for a relational aggregate descriptor, all the descriptors in the inheritance tree must be aggregates. The descriptors for aggregate and non-aggregate classes cannot exist in the same inheritance tree.

Similarly, when configuring inheritance for an EIS composite descriptor, all the descriptors in the inheritance tree must be composites. The descriptors for composite and noncomposite classes cannot exist in the same inheritance tree.

When configuring inheritance for an XML descriptor, because all XML descriptors are composites, descriptor type does not restrict inheritance.