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<Paper uid="W98-0304">
  <Title>Representing temporal discourse markers for generation purposes</Title>
  <Section position="4" start_page="22" end_page="22" type="intro">
    <SectionTitle>
2 Related work
</SectionTitle>
    <Paragraph position="0"> Work on discourse marker generation in general has focussed on marker selection, mainly for causal relations (Elhadad and McKeown 1990; Vander Linden and Martin 1995), and on the realization of RST's subject-matter relations (Rhsner and Stede 1992; Delin et al. 1996). As for temporal markers, Dorr and Gaasterland (1995) examine the generation of English temporal subordinating conjunctions. Gagnon and Lapalme (1993), on the other hand, describe the generation of French temporal adverbs based on a DRT representation of the discourse.</Paragraph>
    <Paragraph position="1"> While Gagnon and Lapalme (1993) only briefly address conjunctions and prepositions, Dorr and Gaasterland (1995) present a detailed study of temporal connectives, but they consider English markers only. The only account on automatically producing German temporal expressions that we know of is Ehrich (1987); however, she discusses the interaction of tense and aspect in simple sentences only.</Paragraph>
    <Paragraph position="2"> Most studies that deal with discourse markers regard their production as a mere consequence of other sentence level decisions such as aggregation, lexicalization, syntactic structuring, and--in the case of temporal markers--as determined by tense and aspectual choices. We believe, however, that one needs a more flexible control to increase the expressiveness of generation systems. Although there have been quite a few studies on individual aspects of sentence planning, little attention has been paid to the interaction between the various tasks--exceptions are Rambow and Korelsky (1992) and Wanner and Hovy (1996)--and in particular to the role of marker choice in the overall sentence planning process.</Paragraph>
    <Paragraph position="3"> There exists a large body of research in NLU on analysing the temporal structure of texts, including the role of temporal markers, though again restricted to English (Moens and Steedman 1988; Lascarides and Oberlander 1993; Hitzeman et al. 1995). We turn to these studies when it comes to identifying the information that needs to be assembled for representing temporal markers.</Paragraph>
  </Section>
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