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The expression of object-orientation can be done in one of two ways.
The concepts of object-orientation can be used purely as a design tool,
and are encoded into, e.g., a relational database. E.g., ER modeling.
The concepts of object-orientation are incorporated into a language that
is used to manipulate the database.
There are several possible languages into which the concepts can be integrated.
Extend a DML such as SQL by adding complex types and object-orientation.
Systems that provide object-oriented extensions to relational systems are
called object-relational systems.
Take an existing object-oriented programming language and extend it to
deal with database. Such languages are called persistent programming
Mon Jun 29 17:30:13 PDT 1998