Conceptual Modeling - ER 2004 23rd International Conference on Conceptual Modeling, Shanghai, China, November 8-12, 2004. Proceedings - Atzeni, Paolo; Atzeni, Paolo; Chu, Wesley; Chu, Wesley; Lu, Hongjun; Lu, Hongjun; Zhou, Shuigeng; Zhou, Shuigeng; Ling, Tok Wang; Ling, Tok Wang (Springer Berlin Heidelberg : Imprint: Springer, 2004)