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<Paper uid="P85-1032">
  <Title>Structure-Sharing in Lexical Representation</Title>
  <Section position="2" start_page="0" end_page="0" type="intro">
    <SectionTitle>
1. Introduction
</SectionTitle>
    <Paragraph position="0"> The project we refer to as HPSG is the current phase of an ongoing effort at Hewiett-Pa~',axd Laboratories to develop an English language understanding system which implements current work in theoretical linguistics. Incorporating innovations in the areas of lexicon, grammar, parser, and semantics, HPSG is the successor to the GPSG system reported on at the 1982 ACL meeting z Like the GPSG system, the current implementation is based on the linguistic theory known Generalized Phrase Structure Grammar, 2 though incorporating insights from Carl Pollard's recent work on Head Grammars ~ which lead us to employ a richer lexicon and a significantly smaller grammar. We report here on the structure of our lexicon, the mechanisms used in its representation, and the resulting sharp decre~e in the number of phrase structure rules needed. 4 I Gawron, et al. (1982).</Paragraph>
  </Section>
class="xml-element"></Paper>