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<Paper uid="P94-1021">
  <Title>Constraint-Based Categorial Grammar Gosse Bouma and Gertjan van Noord Alfa-informatica and Behavorial and Cognitive Neurosciences,</Title>
  <Section position="2" start_page="0" end_page="0" type="intro">
    <SectionTitle>
1 Introduction
</SectionTitle>
    <Paragraph position="0"> Combinations of Categorial Grammar (co) and unification naturally lead to the introduction of polymorphic categories. Thus, Karttunen (1989) categorizes NP's as X/X, where x is a verbal category, Zeevat el al. (1987) assign the category X/(NP\X) to NP's, and Emms (1993) extends the Lambek-calculus with polymorphic categories to account for coordination, quantifier scope, and extraction.</Paragraph>
    <Paragraph position="1"> The role of polymorphism has been restricted, however, by the fact that in previous work categories were defined as feature structures using the simple, nonrecursive, constraints familiar from feature description languages such as PATR. Relational constraints can be used to define a range of polymorphic categories that are beyond the expressive capabilities of previous approaches. null In particular, the introduction of relational constraints captures the effects of (recursive) lexical rules in a computationally attractive manner. The addition of such rules makes it feasible to consider truly 'lexicalist' grammars, in which a powerful lexical component is accompanied by a highly restricted syntactic component, consisting of application only.</Paragraph>
  </Section>
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