This paper outlines the latest version of XISL (eXtensible Interaction Scenario Language). XISL is an XML-based markup language for web-based multimodal interaction systems. XISL enables to describe synchronization of multimodal inputs/outputs, dialog flow/transition, and some other descriptions required for multimodal interaction. XISL inherits these features from VoiceXML and SMIL. The original feature of XISL is that XISL has enough modality-extensibility. We present the basic XISL tags, outline of XISL execution systems, and then make a comparison with other languages.
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Katsurada et al. (2003) studied this question.