Derrick, J. and Smith, G.
Structural refinement in Object-Z / CSP.
In: Grieskamp, W. and Stanten, T. and Stoddart, B., eds.
Proceedings of the Second International Conference on Integrated Formal Methods.
Lecture Notes in Computer Science, 1945.
ISBN 3-540-41196-8 .
State-based refinement relations have been developed for use on the Object-Z components in an integrated Object-Z / CSP specification. However this refinement methodology does not allow the structure of a specification to be changed in a refinement, whereas a full methodology would allow concurrency to be introduced during the development life-cycle. In this paper we tackle these concerns and discuss refinements of specifications written using Object-Z and CSP where we change the structure of the specification when performing the refinement. In particular, we develop a set of structural simulation rules which allow a single Object-Z component to be refined to a number of communicating or interleaved classes. We prove soundness of these rules and illustrate them with a number of small examples.
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