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In this paper, the authors present a new model of class-based Algol-like programming languages inspired by automata-theoretic concepts. The model may be seen as a variant of the "Object-based" model previously proposed by Reddy, where objects are described by their observable behaviour in terms of events. At the same time, it also reflects the intuitions behind state-based models studied by Reynolds, Oles, Tennent and O'Hearn where the effect of commands is described by state transformations. The idea is to view stores as automata, capturing not only their states but also the allowed state transformations. In this fashion, they are able to combine both the state-based and event-based views of objects.
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