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<Paper uid="W91-0209">
  <Title>Lexical Operations in a Unification-based Framework</Title>
  <Section position="5" start_page="99" end_page="99" type="concl">
    <SectionTitle>
4 Conclusion
</SectionTitle>
    <Paragraph position="0"> We have argued that our notion of lexical rule can capture the productive linguistic element of derivationai morphological processes and metonymic and metaphorical sense extensions. In order to do this adequately we need rich lexical semantic information but we do not need to resort to general deductive or abductive inference on unconstrained world knowledge. By using semantic information to structure the lexicon, by means of types and inheritance, we can represent relationships between lexical rules and view them as essentially fully productive over defined subparts of the lexicon, while providing an initial account of blocking and lexicalisation. Itowever the work described here is at a preliminary stage. We need to provide detailed accounts of a range of derivation and conversion processes to see how adequately we can represent them as lexical rules, while structuring the lexicon and type system appropriately to constrain their operation.</Paragraph>
  </Section>
class="xml-element"></Paper>