A little over a decade has passed since the release of the ?rst Netscape browser. In 1995, the World Wide Web was viewedlargelyas an academiccuriosity.Now, of course, the Web is an integral part of the fabric of modern society. It is impossible to imagine science, education, commerce, or government functioning without the Web. We take the Web for granted, and often assume that Internet connectivity is guaranteed to all of us as a birthright. Although the Web indeed has become world wide and has lost a bit of its original aura as a consequence of its ubiquity, a burgeoning community of researchers and practitioners continues to work toward the next generation of the Web a Web where information will be stored in a machine-processable form and where intelligent computer-based agents will access and automatically combine myriad services on the Internet of the kind that are now available only to people interacting directly with their Web browsers."

by Roberto Cencioni At the Lisbon Summit in March 2000, European heads of state and government set a new goal for the European Union - to become the most competitive knowled- based society in the world by 2010. As part of this objective, ICT (information and communication technologies) services should become available for every citizen, and for all schools, homes and businesses. The book you have in front of you is about Semantic Web technology and law. Law is something omnipresent; all citizens - at some points in their lives - have to deal with it. In addition, law involves a large group of professionals, and is a mul- billion business world wide. Information technology is important because it that can improve citizens' interaction with law, as well as improve legal professionals' work environment. Legal professionals dedicate a significant amount of their time to finding, reading, analyzing and synthesizing information in order to take decisions, and prepare advice and trials, among other tasks. As part of the "Semantic-Based Knowledge and Content Systems" Strategic Objective, the European Commission is funding projects to construct technology to make the Semantic Web vision come true. 1 The articles in this book are related to two current foci of the Strategic Objective : * Knowledge acquisition and modelling, capturing knowledge from raw information and multimedia content in webs and other distributed repositories to turn poorly structured information into machi- processable knowledge.

This book constitutes the refereed proceedings of the 13th International Conference on Knowledge Engineering and Knowledge Management, EKAW 2002, held in Siguenza, Spain in October 2002. The 20 revised full papers and 14 revised short papers presented together with an invited contribution were carefully reviewed and selected from a total of 110 submissions. The papers address all current issues in knowledge processing and key ingredients for building the semantic web, such as ontologies, knowledge modeling and representation, languages and tools, knowledge management, and knowledge acquisition.