Abstract. For various purposes in the Verbmobil system it is necessary to build a full model of an unfolding dialog, on a suitably abstract level of representation. The basis of this model are representations of the individual utterances, and we capture their content by a combination of dialog act and propositional content. Our hierarchy of dialog acts was used to annotate 21 CD-ROMs from the Verbmobil corpus, and the experience gained with the framework influenced standardization efforts in the international scientific community. On the side of propositional content, particular attention was given to the representation of temporal expressions, due to the application domains of Verbmobil.
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