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<Paper uid="C90-3046">
  <Title>Japanese Sentence Analysis as Argumentation</Title>
  <Section position="2" start_page="0" end_page="0" type="intro">
    <SectionTitle>
1 Introduction
</SectionTitle>
    <Paragraph position="0"> Sentence analyses are essentially reasoning processes which derive assumptions/expectations t?om observed input sentences. A syntactic structure ex-.</Paragraph>
    <Paragraph position="1"> tracted fl'om a sentence by parsing is only a prediction, and may be invalidated by semantic or contextual analyses. This is because interpretation of a sentence requires the use of semantic and contextual analyses to determine its meaning, and because information expressed by an utterance is partial. Furthermore, even when utterances are not grammatical, it is impractical for a parser to reject them because of their ungrammatieality. Therefore, the following two desiderata can be considered for such sentence analyses: to select plausible candidates from among many possible candidates and to integrate, in a uniform manner, syntactic, semantic, m~d pragmatic processing. null From these viewpoints, this paper proposes that sentence analysis should be treated as defeasible reasoning, and presents such a treatment using an argumentation system \[7\], which is a formalization of defeasible rea~soning, that includes arguments and defeat rules that capture defe,asibility. In particular, this paper discusses treatments of chart parsing \[5\], e~use analyses, and interpretation of Japanese noun phrases with adnominal particles. Since there is a continuity from syntactic analysis (parsing) to semantic and contextual analyses when viewed as reasoning processes, we use the word analysis rather than parsing.</Paragraph>
  </Section>
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