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# Descriptors and Aggregation

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Two objects–a source (parent or owning) object and a target (child or owned) object–are related by aggregation if there is a strict one-to-one relationship between them, and all the attributes of the target object can be retrieved from the same data source representation as the source object. This means that if the source object exists, then the target object must also exist, and if the source object is destroyed, then the target object is also destroyed.

In this case, the descriptors for the source and target objects must be designated to reflect this relationship as follows:

- Aggregate and Composite Descriptors in Relational Projects

- Root and Composite Descriptors in EIS Projects

- Composite Descriptors in XML Projects