User's Guide: A Framework for Object Persistency for GNAT; Version 0.6.1; Document Revision $Revision: 1.17 $
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Deriving persistent objects

In order to support inheritance the ODL allows to derive new persistent types from a persistent type.

ISA Clause

The attribute keyword may only be used within persistent object. Itr allows to indicate those fields which will be stored in the persistent object storage.

Example 6-4. Syntax: ISA Clause

		type <name> ISA <name> with ........... ;