, pp. 645-656, 2003. Personalization Paradigm in Service Delivery Platforms 19. J. Chomicki. Querying with intrinsic preferences. In Proceedings of the 8th EDBT, Prague, Czech Republic, pp. 34-51, 2002. 20. L. Cranor, B. Dobbs, S. Egelman, G. Hogben, J. Humphrey, M. Langheinrich, M. Marchiori, M. Presler-Marshall, J. Reagle, and M. Schunter. The platform for privacy preferences 1.1 (p3p 1.1) specification. Technical report, W3C, 2005. 21. P. Dell'Acqua, L. Pereira, and A. Vitoria. User preference information in query answer- ing. In Proceedings of the 5th International Conference on Flexible Query Answering Systems, Copenhagen, Denmark, pp. 163-173, 2002. 22. K. L. Dempski. Real time television content platform: Personalized programming over existing broadcast infrastructures. In Proceedings of the 2nd International Conference on Adaptive Hypermedia and Adaptive Web-based System, USA, 2002. 23. A. K. Dey. Understanding and using context. Personal and Ubiquitous Computing, 5(1): 4-7, 2001. 24. P. Germanakos and C. Mourlas. Adaptation and personalization of web-based multi- media content. In Digital Multimedia Perception and Design, G. Ghinea and S. Y. Chen (Eds.), Idea Group, Inc., Hershey, USA, pp. 284-304. 25. A. Y. Halevy. Answering queries using views: A survey. The VLDB Journal, 10:270-294, 2001. 26. J. Han and M. Kamber. Data Mining: Concepts and Techniques. Morgan Kaufmann Publishers, New York, USA, 550pp. ISBN 1-55860-489-8, 2000. 27. O. Hasan, M. E. Atwood, J. Waters, and B. W. Char. A context-sensitive search mecha- nism. In Proceedings of INMIC. 8th International Volume, Lahore, Pakistan, pp. 368- 374, 2004. 28. S. Holland and W. Kiessling. Situated preferences and preference repositories for personalized database applications. In ER-Conceptual Modeling, Shanghai, China, pp. 511-523, 2004. 29. F. K. Hwang, D. S. Richards, and P. Winter. The Steiner Tree Problem. Elsevier, North- Holland, Netherlands, 1992. W. Kiessling. Foundations of preferences in database systems. In Proceedings of the 28th Conferenc