Release 10.1A: OpenEdge Getting Started:
Object-oriented Programming

> ## Designing Objects — Inheritance, Polymorphism, and Delegation

> The previous chapters introduce the basic syntax that supports classes in the Progress 4GL. This chapter provides more conceptual material and shows how you might use classes in an application, as described in the following sections:

> - Inheritance and the class hierarchy

> - Using polymorphism with classes

> - Using delegation with classes

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