Modularisation Plug-in Composition Semantics

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TODO: This is an internal draft document

The meaning of module composition

This page explains what it means to import a module and rely on the interface operations implemented by the module. In particular, how one can, at least in principle, construct a single flat Event-B machine from a specification where a final refinement step and its abstraction rely on modules. This serves two purposes: it gives exact characterisation of the behaviour of a modular specification; it serves as a reference for implementation-stage composition strategies.

Approach 1: Reducing to A-style

Approach 2: Atomicity Refinement