UsiComp: An Extensible ModelDriven Composer

Modern User Interfaces need to dynamically adapt at runtime to their context of use, i.e. mainly to the changes that can oc-cur in the environment or in the platform. Model-Driven En-gineering offers powerful solutions to handle the design and the implementation of such UIs. But this approach requires the creation of an important amount of models and trans-formations, each of them in turn requiring specific knowl-edge and competencies. This leads to the need of an adapted tool sustaining the designers ’ work. This paper presents Usi-COMP, an integrated and open framework that makes the de-sign and the runtime easier. It relies on a service-based archi-tecture and proposes two modules, for design and execution. The implementation has been made using OSGi services of-fering dynamic possibilities for using and extending the tool. This paper describes this architecture and shows the extension capacities of the framework through two running examples