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<Paper uid="P98-2199">
  <Title>Segregatory Coordination and Ellipsis in Text Generation</Title>
  <Section position="4" start_page="1220" end_page="1220" type="relat">
    <SectionTitle>
3 Related Work
</SectionTitle>
    <Paragraph position="0"> Because sentences with coordination can express a lot of information with fewer words, many text generation systems have implemented the generation of coordination with various levels of complexities. In earlier systems such as EPICURE (Dale, 1992), sentences with conjunction are formed in the strategic component as discourse-level optimizations. Current systems handle aggregations decisions including coordination and lexical aggregation, such as transforming propositions into modifiers (adjectives, prepositional phrases, or relative clauses), in a sentence planner (Scott and de Souza, 1990; Dalianis and Hovy, 1993; Huang and Fiedler, 1996; Callaway and Lester, 1997; Shaw, 1998).</Paragraph>
    <Paragraph position="1"> Though other systems have implemented coordination, their aggregation rules only handle simple conjunction inside a syntactic structure, such as subject, object, or predicate. In contrast to these localized rules, the staged algorithm used in CASPER is global in the sense that it tries to find the most concise coordination structures across all the propositions. In addition, a simple heuristic was proposed to avoid generating overly complex and potentially ambiguous sentences as a result of coordination.</Paragraph>
    <Paragraph position="2"> CASPER also systematically handles ellipsis and coordination in prepositional clauses which were not addressed before. When multiple propositions are combined, the sequential order of the propositions is an interesting issue. (Dalianis and Hovy, 1993) proposed a domain specific ordering, such as preferring a proposition with an animate subject to appear before a proposition with an inanimate subject. CASPER sequentializes the propositions according to an order that allows the most concise coordination of propositions. null</Paragraph>
  </Section>
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