Proof-Carrying Model-Transformation Components

As model transformations become a more common tool in a software engineer’s toolbox, there is an increasing need for systematic development techniques for them. Among other things, it becomes increasingly important to be able to safely modularise a model transformation specification as well as to compose new transformations from pre-existing transformation modules. While some initial work has been done to allow transformations to be expressed in a more modular fashion, reuse of such modules requires great care as there is no formal semantics nor a notion of contracts. We present an encoding of model transformations based on constructive type theory. In particular, this allows us to provide formal semantics to transformation modules including an explicit representation and verification of the dependencies of a model-transformation module.