Structural Refinement in Object-Z/CSP

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 small example.

• Type: Conference
• Year: 2000
• Where: IFM
• Authors: John Derrick, Graeme Smith
• Keywords: Formal Methods, IFM 2000, Object-Z, Object-z Component, State-based Refinement Relations