In: T. Pellegrini; S. Schaffert (Hrsg.). Proceedings of I-MEDIA '07 and I-SEMANTICS '07 International Conferences on New Media Technology and Semantic Systems as part of (TRIPLE-I 2007), September 5-7, Graz, Austria. International Conferences on Knowledge Management and New Media Technology (I-MEDIA), Pages 270-277, J.UCS, Online-Proceedings, 9/2007.