1. Léonard de Vinci Pôle Universitaire, Research Center, France and Saarland University, Saarland Informatics Campus, Germany and Dpt. SES, CNRS i3, Télécom Paris, Institut Polytechnique de Paris, France
2. Léonard de Vinci Pôle Universitaire, Research Center, France and Projekt and Chrome, Université de Nimes, France
3. OFFIS - Institute for Information Technology, Germany
4. Dpt. SES, CNRS i3, Télécom Paris, Institut Polytechnique de Paris, France
5. Saarland University, Saarland Informatics Campus, Germany
6. Léonard de Vinici Pôle Universitaire, Research Center, France