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<正>Document Object Model(DOM)is widely used fordynamic description of eXtensible Markup Language(XML)document and its manipulations.VoiceXML is anXML instance targeting voice interaction for enterpriselevel telephony applications.A design on DOM extensionfor VoiceXML is thus introduced in this paper to providea standard way on VoiceXML manipulation and build anexposing mechanism for VoiceXML applications.Coreextension module and event module are presented indetail.