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Supporting an Object-Oriented Programming Methodology using PS-Algol

We describe a database programming system which supports an object-oriented programming methodology in the persistent programming language PS-algol. The methodology incorporates most of the familiar object-oriented concepts including: object identity; classification and specialization; inheritance and data encapsulation. In describing the implementation, we emphasize the particular features of PS-algol we exploit, namely orthogonal persistence, functions being first-class values, the extensible union type, and the callable compiler. The resultant software partnered with PS-algol can be viewed as an embryonic object-oriented database programming system, and comparisons with other such systems are drawn.