D. Elenius, M. Johnson, R. Ford, G. Denker, and D. Martin. Proceedings of the 6th International Semantic Web Conference and 2nd Asian Semantic Web Conference (ISWC/ASWC2007), Busan, South Korea, volume 4825 of LNCS, page 743--756. Berlin, Heidelberg, Springer Verlag, (November 2007)