Y. Zhao, K. Wang, R. Topor, J. Pan, and F. Giunchiglia. Proceedings of the 6th International Semantic Web Conference and 2nd Asian Semantic Web Conference (ISWC/ASWC2007), Busan, South Korea, volume 4825 of LNCS, page 659--672. Berlin, Heidelberg, Springer Verlag, (November 2007)