Compositional Action System Refinement
We show how a parallel composition of action systems can be refined by refining the components separately, and checking non-interference against invariants and guarantee conditions, which are abstract and stable. The guarantee condition can be thought of as a very abstract specification of how a system affects the global state, and it allows us to show that an action system refinement is valid in a given environment, even if we do not know any of the details of that environment. The paper extends the traditional notion of action systems slightly, and it makes use of a generalisation of the attribute model for program variables.
KeywordsAction systems Refinement Compositionality Rely/guarantee
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