3rd International Workshop on Web Dynamics in conjunction with the 13th International World Wide Web Conference New York City, New York, USA, May 18, 2004 Session 1 Dynamics of Search Engine Rankings – A Case Study Judit Bar-Ilan, Mark Levene, and Mazlita Mat-Hassan ...................................................................................................... 3 Local Methods for Estimating PageRank Values Yen-Yu Chen, Qingqing Gan, and Torsten Suel ................................................................................................................ 14 Finding Relevant Web Pages Through Equivalent Hyperlinks Simon Courtenage, and Steven Williams .............................................................................................................................. 24 Session 2 A Context Ultra-Sensitive Approach to High Quality Web Recommendations based on Web Usage Mining and Neural Network Committees Olfa Nasraoui, and Mrudula Pavuluri ................................................................................................................................... 32 Mining Evolving Web Clickstreams with Explicit Retrieval Similarity Measures Olfa Nasraoui, Cesar Cardona, and Carlos Rojas .............................................................................................................. 42 A Recommendation Model Based on Latent Principal Factors in Web Navigation Data Yanzan Zhou, Xin Jin, and Bamshad Mobasher................................................................................................................. 52 Session 3 RDFTL : An Event-Condition-Action Language for RDF George Papamarkos, Alexandra Poulovassilis, and Peter Wood ..................................................................................... 62 A Dataflow Approach To Efficient Change Detection of HTML/XML Documents in WebVigiL Anoop Sanka, Shravan Chamakura, and Sharma Chakravarthy ....................................................................................... 76 Modeling Semantic Web Services with OPM/S – A Human and Machine-Interpretable Language Dov Dori, Eran Toch, and Iris Reinhartz-Berger ............................................................................................................... 86 Session 4