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Báo cáo khoa học: "DiMLex: A lexicon of discourse markers for text generation and understanding"

Discourse markers ('cue words') are lexical items that signal the kind of coherence relation holding between adjacent text spans; for example, because, since, and for this reason are different markers for causal relations. Discourse markers are a syntactically quite heterogeneous group of words, many of which are traditionally treated as function words belonging to the realm of grammar rather than to the lexicon. | DiMLex A lexicon of discourse markers for text generation and understanding Manfred Stede and Carla Umbach Technische Universităt Berlin Projektgruppe KIT Sekr. FR 6-10 Franklinstr. 28 29 D-10587 Berlin Germany email stede umbach @cs.tu-berlin.de Abstract Discourse markers cue words are lexical items that signal the kind of coherence relation holding between adjacent text spans for example because since and for this reason are different markers for causal relations. Discourse markers are a syntactically quite heterogeneous group of words many of which are traditionally treated as function words belonging to the realm of grammar rather than to the lexicon. But for a single discourse relation there is often a set of similar markers allowing for a range of paraphrases for expressing the relation. To capture the similarities and differences between these and to represent them adequately we are developing DiMLex a lexicon of discourse markers. After describing our methodology and the kind of information to be represented in DiMLex we briefly discuss its potential applications in both text generation and understanding. 1 Introduction Assuming that text can be formally described and represented by means of discourse relations holding between adjacent portions of text e.g. Mann Thompson 1988 we use the term discourse marker for those lexical items that in addition to non-lexical means such as punctuation aspectual and focus shifts etc. can signal the presence of a relation at the linguistic surface. Typically a discourse relation is associated with a wide range of such markers consider for instance the following variety of Concessions which all express the same underlying propositional content. The words treated here as discourse markers are underlined. We were in SoHo nevertheless I nonetheless I however I still I yet we found a cheap bar. We were in SoHo but we found a cheap bar anyway. Despite the fact that we were in SoHo we found a cheap bar. Notwithstanding the fact