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Erschienen in:
2012 | OriginalPaper | Buchkapitel
Refinement by Interface Instantiation
verfasst von : Stefan Hallerstede, Thai Son Hoang
Erschienen in: Abstract State Machines, Alloy, B, VDM, and Z
Verlag: Springer Berlin Heidelberg
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Decomposition is a technique to separate the design of a complex system into smaller sub-models, which improves scalability and team development. In the shared-variable decomposition approach for Event-B sub-models share external variables and communicate through external events which cannot be easily refined.
Our first contribution hence is a proposal for a new construct called interface that encapsulates the external variables, along with a mechanism for interface instantiation. Using the new construct and mechanism, external variables can be refined consistently. Our second contribution is an approach for verifying the correctness of Event-B extensions using the supporting Rodin tool. We illustrate our approach by proving the correctness of interface instantiation.