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In this paper, we describe our work in progress on the reasoning module of ec(h)o, an augmented audio-reality interface for museum visitors utilizing spatialized soundscapes and a semantic web approach to information. We used ontologies to describe the semantics of sound objects and represent user model. A rulebased system for selecting sound object uses semantic description of objects, visitor's interaction history and heuristics for continuity of the dialogue between user and the system.doi:10.1145/1013367.1013488 dblp:conf/www/KalantariHW04 fatcat:ktrqiwarfzctnh2b2plpahsq2i