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International audienceThe MDA approach aims to ease software maintenance faced with platform and business evolution. In this approach, main development artifacts, i.e. models, are defined with the meta object facility (MOF) standard. To support collaborative development in MDA, we propose a mechanism for merging concurrent changes to MOF models. Our approach has the following novel functionality. First, as MOF models can have ordered relations, our mechanism can identify the order changes in MOF models, detect the conflicts caused by concurrent order changes, and integrate those changes. Second, as MOF models must respect multiplicity constraints, our mechanism detects the concurrent modifications that result in multiplicity violations. Therefore, it ensures the consistency of the merge result. Third, we offer a framework for building conflict resolution programs dedicated to developers' particular requirements. This framework offers a flexible and automated way for resolving conflicts. This work is a part of ModelBus, an open environment for CASE tool interoperability. Its contribution is to enable models to be concurrently modified by several developers and with different tools. ModelBus implementation is available as the Eclipse open source project, model driven development integration (MDDi)

This work presents an approach for realizing Model-Driven software engineering in the distributed and multi-developers context. It particularly focuses on the scalability problems in a complex software project involving a large set of inter-connected models: (1) how to manipulate large data volume with limited computing resources, and (2) how to maintain consistency of inter-model links in a large model set, facing to concurrent model updates. As a solution, we propose the scalable copy-modifymerge mechanism, which allows each developer to copy only a model subset from the entire model set, to manipulate this subset locally, and to merge it back to the repository. This mechanism ensures the global consistency of the model set, particularly against dangling links. Our approach is generic: it is applicable to all model types (UML and Domain-Specific Models). Also, it offers interoperability with existing, heterogeneous CASE tools. Its prototype implementation in the ModelBus environment is now available on the Eclipse project "MDDi".