RIDE'04 Service Description and Matchmaking Security Service Discovery and Composition Secure Interoperability, Availability and Dependability Document Publishing, Caching, and Versioning Keynote Talk1: Leveraging of Social Science and Applied Science for E-government Applications Keynote Talk2: The Challenges of Delivering Content and Applications on the Internet Cover Page Message from the General Chairs Message from the Program Chairs ©2005 Association for Computing Machinery