1. Siemens Corporate Technology, Information and Communications, Otto-Hahn-Ring 6, Munich, Germany, thilo.grundmann.ext@siemens.com
2. Siemens Corporate Technology, Information and Communications, Otto-Hahn-Ring 6, Munich, Germany
3. Forschungszentrum Informatik, Haid-und-Neu-Str. 10-14 Karlsruhe, Germany, xue@fzi.de
4. Forschungszentrum Informatik, Haid-und-Neu-Str. 10-14 Karlsruhe, Germany
5. Fraunhofer IPA, Nobelstrasse 12, Stuttgart, Germany, jens.kuehnle@ipa.fraunhofer.de
6. Fraunhofer IPA, Nobelstrasse 12, Stuttgart, Germany