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This paper describes an XPath-based discourse analysis module for Spoken Dialogue Systems that allows the dialogue author to easily manipulate and query both the user input's semantic representation and the dialogue context using a simple and compact formalism. We show that, in managing the human-machine interaction, the discourse context and the dialogue history are effectively represented as Document Object Model (DOM) structures. DOM defines interfaces that dialogue scripts can use todoi:10.1145/1013367.1013499 dblp:conf/www/FabbrizioL04 fatcat:r2spuz7mqbbx3luxq4re5k6vfq