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Object-oriented analysis methods can incorporate the concept of constraints to express rules of the problem domain in the specification model, restricting the possible instances of the model. As such, constraints describe properties that must be true at each moment in time for the entire system, without determining how they are to be preserved. The ways in(More)
The main features of Algol 68 are explained from a semantic point of view. It is shown how the language permits the composition of values and actions, i.e. ultimately programs, from a minimum set of primitives with a few fundamental recursive rules of composition. The associated syntax is briefly reviewed. An attempt has been made to obtain a structured and(More)