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• W2001570688 abstract "Abstract Event-B provides a flexible framework for stepwise system development via refinement. The framework supports steps for (a) refining events (one-by-one), (b) splitting events (one-by-many), and (c) introducing new events. In each of the steps events can be indicated as convergent (to be made internal) or anticipated (treatment deferred to a later refinement step). All such steps are accompanied with precise proof obligations. However, no behavioural semantics has been provided to validate the proof obligations, and no formal justification has previously been given for the application of these rules in a refinement chain. Behavioural semantics expresses a clear relationship between the first and last machines in a refinement chain. The framework we present provides a coherent justification for Abrial’s approach to refinement in Event-B, and its generalisation to interface extension: adding events to the interface. In this paper, we give a behavioural semantics for Event-B refinement, with a treatment for the first time of splitting events and of anticipated events, adding to the well-understood treatment of convergent events. To this end, we define a CSP semantics for Event-B and show how the different forms of Event-B refinement can be captured as CSP refinement. It turns out that the appropriate CSP refinement relationship is influenced by the particular Event-B development strategy taken. We present two such strategies, one allowing, the other disallowing interface extensions." @default.
• W2001570688 created "2016-06-24" @default.
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• W2001570688 date "2014-03-01" @default.
• W2001570688 modified "2023-10-01" @default.
• W2001570688 title "The behavioural semantics of Event-B refinement" @default.
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• W2001570688 doi "https://doi.org/10.1007/s00165-012-0265-0" @default.
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