In: Bärbel Mersching; Marcus Hund; Zaheer Aziz (Hrsg.). KI 2009: Advances in Artificial Intelligence. German Conference on Artificial Intelligence (KI-2009), September 15-18, Paderborn, Germany, Pages 249-256, Lecture Notes in Artificial Intelligence (LNAI), Vol. 5803, ISBN 978-3-642-04616-2, Springer-Verlag, Heidelberg, 9/2009.