Welcome to the proceedings of the 13th International Conference on Database Systems for Advanced Applications (DASFAA 2008) which was held in New Delhi, India. DASFAA 2008 continued the tradition of providing an inter- tional forum for technical discussion among researchers, developers and users of database systems from academia, business and industry. Organizing DASFAA 2008 was a very rewarding experience; it gave us an excellent opportunity to work with many ?ne colleagues both within and outside India. We would like to thank Jayant Haritsa and Ramamohanarao Kotagiri for putting together a world-classProgramCommittee. The committee workedvery hardto bring a high-qualitytechnical programto the conference.DASFAA 2008 also included an industrial track co-chaired by Anand Deshpande and Takeshi Fukuda. The conference also featured three tutorials: (1) Preference Query For- lation and Processing: Ranking and Skyline Query Approaches, by Seung-Won Huang and Wolf-Tilo Balke, (2) Stream Processing: Going Beyond Database Management Systems, by Sharma Chakravarthy, and (3) The Semantic Web: Semantics for Data and Services on the Web, by Vipul Kashyap and Christoph Bussler. We would like to thank S. Sudarshan and Kian-lee Tan for their e?ort in organizing the tutorials, Srinath Srinivasa and Wookey Lee for the panels, Prasan Roy and Anthony Tung for the demos, and Sanjay Chawla and Chee- Yong Chan for the workshops.

This book constitutes the refereed proceedings of the 12th International Conference on Database Systems for Advanced Applications, DASFAA 2007, held in Bangkok, Thailand, April 2007. Coverage includes query language and query optimization, data mining and knowledge discovery, P2P and grid-based data management, XML databases, database modeling and information retrieval, Web and information retrieval, database applications and security.

This book constitutes the refereed proceedings of the Second Pacific-Asia Conference on Knowledge Discovery and Data Mining, PAKDD-98, held in Melbourne, Australia, in April 1998. The book presents 30 revised full papers selected from a total of 110 submissions; also included are 20 poster presentations. The papers contribute new results to all current aspects in knowledge discovery and data mining on the research level as well as on the level of systems development. Among the areas covered are machine learning, information systems, the Internet, statistics, knowledge acquisition, data visualization, software reengineering, and knowledge based systems.