Benjamin Klatt, Klaus Krogmann FZI Forschungszentrum Informatik Haid-und-Neu-Str. 10-14, 76131 Karlsruhe, Germany {klatt,krogmann}@fzi.de 1

Jan Jelschen, Andreas Winter Carl von Ossietzky Universit¨ at, Oldenburg, Germany {jelschen,winter}@se.uni-oldenburg.de Abstract

Benjamin Klatt, Martin K¨ uster, Klaus Krogmann, Oliver Burkhardt FZI Research Center for Information Technology Haid-und-Neu-Str. 10-14, 76131 Karlsruhe, Germany {klatt,kuester,krogmann,burkhardt}@fzi.de 1 Introduction