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<Paper uid="W00-1415">
  <Title>An Empirical Analysis of Constructing Non.restrictive NP Modifiers to Express Semantic Relations</Title>
  <Section position="2" start_page="0" end_page="0" type="abstr">
    <SectionTitle>
Abstract
</SectionTitle>
    <Paragraph position="0"> It is not a rare phenomenon for human written text to use non-restrictive NP modifiers to express essential pieces of information or support the situation presented in the main proposition containing the NP, for example, &amp;quot;Private Eye, which couldn't afford the libel payment, had been threatened with closure.&amp;quot; (from Wall Street Journal) Yet no previous research in NLG investigates this in detail. This paper describes corpus analysis and a psycholinguistic experiment regarding the acceptability of using non-restrictive NP modifiers to express semantic relations that might normally be signalled by 'because' and 'then'. The experiment tests several relevant factors and enables us to accept or reject a number of hypotheses. The results are incorporated into an NLG system based on a Genetic Algorithm.</Paragraph>
  </Section>
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