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Workshops, June 1stWorkshop 1: 1st International Workshop on the Semantic Sensor Web (SemSensWeb 2009) Workshops, May 31stWorkshop 7: 5th Workshop on Scripting and Development for the Semantic Web (SFSW2009) 1st International Workshop on Stream Reasoning (SR2009) (Half day)Data streams occur in a variety of modern applications, such as network monitoring, traffic engineering, sensor networks, RFID tags applications, telecom call records, financial applications, Web logs, click-streams. They have been studied since 2000 and todaySpecialized Stream Database Management Systems exist. While such systems proved to be an optimal solution for on the fly analysis of data streams, such systems suffers from several limitation. They cannot handle heterogeneous data streams originating from a variety of already deployed sensors. They cannot combine data streams with slowly evolving knowledge at query time. They cannot perform reasoning tasks. At the same time, while reasoners are year after year scaling up in the classical, time invariant domain of ontological knowledge; reasoning upon rapidly changing information has been neglected or forgotten. Thus, we are assisting to the rising of a new trend, hereby named "Stream Reasoning" as an unexplored, yet high impact, research area; a new multi-disciplinary approach which will provide the abstractions, foundations, methods, and tools required to give answer to questions concerning reasoning over streaming data, such as: "is a traffic jam going to happen in this highway? And is then convenient to reallocate travelers based upon the forecast?" or Starting from lesson learned in the database community, new foundational theories can be developed, rooted into formal disciplines such |