Welcome to WWW9! Message from the Program Committee Chair. Credits. Performance. Integrating user-perceived quality into Web server design (N. Bhatti, A. Bouch, A. Kuchinsky). Analyzing factors that influence end-to-end Web performance (B. Krishnamurthy, C.E. Wills). SPREAD: scalable platform for reliable and efficient automated distribution (P. Rodriguez, S. Sibal). Security. Risks of the Passport single signon protocol (D.P. Kormann, A.D. Rubin). Design and implementation of an access control processor for XML documents (E. Damiani, S. De Capitani di Vimercat, S. Paraboschi, P. Samarati). Supporting reconfigurable security policies for mobile programs (B. Hashii, S. Malabarba, R. Pandey, M. Bishop). Rich queries. Squeal: a structured query language for the Web (E. Spertus, L.A. Stein). Robust intra-document locations (T.A. Phelps, R. Wilensky). Integrating keyword search into XML query processing (D. Florescu, D. Kossmann, I. Manolescu). XML session-1. Web modelling Language (WebML): a modeling language for designing Web sites (S. Ceri, P. Fraternali, A. Bongio). JavaML: a markup language for Java source cod (G.J. Badros). An interchange format for cross-media personalized publishing (P. van Amstel, P. van der Eijk, E. Hassdijk, D. Kuilman). Mobile access. Annotation-based Web content transcoding (M. Hori, G. Kondoh, K. Ono, S.i. Hirose, S. Singhal). Focused Web searching with PDSa (O. Buyukkokten, H. Garcia-Molina, A. Paepcke). Two approaches to bringing Internet services to WAP devices (E. Kaasinen, M. Aaltonen, J. Kolari, S. Melakoski, T. Laakko). Storage infrastructure. The Term Vector Database: fast access to indexing terms for Web pages (R. Stata, K. Bharat, F. Maghoul). How dynamic is the Web? (B.E. Brewington, G. Cybenko). WebBase: a repository of Web pages (J. Hirai, S. Raghavan, H. Garcia-Molina, A. Paepcke). Web characterization. On near-uniform URL sampling (M.R. Henzinger, A. Heydon, M. Mizenmacher, M. Najork). Graph structure in the Web (A. Broder, R. Kumar, F. Maghoul, P. Raghavan, S. Rajagopalan, R. Stata, A. Tomkins, J. Wiener). BLT: Bi-layer Tracing of HTTP and TCP/IP (A. Feldmann). Practice and experience. Web search behaviour of Internet experts and newbies (C. Hölscher, G. Strube). Extensible use of RDF in a business context (K. Forsberg, L. Dannstedt). The evolution of a manufacturing Web site (S.L. Fowler, A.-M.J. Novack, M.J. Stillings). Hypermedia and link analysis. Link prediction and path analysis using Markov chains (R.R. Sarukkai). The stochastic approach for link-structure analysis (SALSA) and the TKC effect (R. Lempel, S. Moran). Concepts for improved visualization of Web link attributes (H. Weinreich, W. Lamersdorf). Search and ranking. Query routing for Web search engines: architecture and experiments (A. Sugiura, O. Etzioni). ADMIRE: an adaptive data model for meta search engines (L. Huang, M. Hemmje, E.J. Neuhold). An efficient algorithm to rank Web resources (D. Zhang, Y. Dong). WTMS: a system for collecting and analyzing topic-specific Web information (S. Mukherjea). Tools. Semantic community Web portals (S. Staab, J. Angele, S. Decker, M. Erdmann, A. Hotho, A. Maedche, H.-P. Schnurr, R. Studer, Y. Sure). SearchPad: explicit capture of search context to support Web search (K. Bharat). Automating Web navigation with the WebVCR (V. Anupam, J. Freire, B. Kumar, D. Lieuwen). Continuous querying in database-centric Web applications (J.C. Shafer, R. Agrawal). Hypermedia. AVoN calling: AXL for voice-enabled Web navigation (S. Rollins, N. Sundaresan). Open hypermedia as user controlled meta data for the Web (K. Grønbæk, L. Sloth, N.O. Bouvin). I-Views: a community-oriented system for sharing streaming video on the Internet (P. Pan, G. Davenport). Enhancing Web accessibility via the Vox Portal and a Web-hosted dynamic HTML - VoxML converter (S. Goose, M. Newman, C. Schmidt, L. Hue). Architecture. HTTP 'Next Generation' (M. Spreitzer, B. Janssen). Customized Internet radio (V. Krishnan, S.G. Chang). Running the Web backwards: appliance data services (A.C. Huang, B.C. Ling, J.J. Barton, A. Fox). Caching. Latency-sensitive hashing for collaborative Web caching (K.-L. Wu, P.S. Yu). Proactive Web caching with cumulative prefetching for large multimedia data (J. Jung, D. Lee, K. Chon). Protocol considerations for a prefix-caching proxy for multimedia streams (S. Gruber, J. Rexford, A. Basso). Data mining. Using Memex to archive and mine communitity Web browsing experience (S. Chakrabarti, S. Srivastava, M. Subramanyam, M. Tiwari). Web-collaborative filtering: recommended music by crawling the Web (W.W. cohen, W. Fan). Mining the Web for relations (N. Sundaresan, J. Yi). XML session-2. Presenting tailored resource descriptions: will XSLT do the job? (A. Crawsey). SilkRoute: trading between relations and XML (M. Fernández, W.-C. Tan, D. Suciu). Millau: an encoding format for efficient representation and exchange of XML over the Web (M. Girardor, N. Sundaresan). E-commerce. An entropy approach to unintrusice targeted advertising on the Web (J.A. Tomlin). A Web marketing system with automatic pricing (N. Abe, T. Kamba). MicolSPs: providing convenient and low-cost high-bandwidth access (J. Brustoloni, J. Garay). Content and control. Object browsing using the Internet Imaging Protocol (K. Martinez, S. Perry, J. Cupitt). Discovering the gap between Web site designers' expectations and users' behaviour (T. Nakayama, H. Kato, Y. Yamane). What is this page known for? Computing Web page reputations (D. Rafiei, A.O. Mendelzon). Author Index. Subject Index.