Compositional Modelling and Reasoning in an Institution for Processes and Data

The language Csp-Casl combines specifications of data and processes. We give an institution based semantics to Csp-Casl that allows us to re-use the institution independent structuring mechanisms of Casl. Furthermore, we extend Csp-Casl with a notion of refinement that reconciles the differing philosophies behind the refinement notions for Csp and Casl. We develop a compositional proof calculus for refinement along the Casl structuring mechanisms, and demonstrate that compositional proof techniques along parallel process composition from the context of Csp lifts to structured Csp-Casl specifications.