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ACM SIGMOD Digital Symposium Collection - Volume 8 (DiSC'06) © 2006 ACM, Inc. 2005 Proceedings of ACM SIGMOD, PODS, CIKM, CVDB, DaMoN, DMSN, DOLAP, GIR, GIS, HyperText, IHIS, IQIS, JCDL, KRAS, MDM, MIR, MobiDE, P2PIR, WIDM, SIGKDD and SIGIR, and 2005 Volumes of TODS. Copyright © 2005 by the Association for Computing Machinery, Inc. 2005 Volumes of SIGMOD Record, SIGIR Forum and KDD Explorations are publications of ACM, however, the authors retain copyright to their contributions, and should be contacted directly for permission.

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