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<Paper uid="P80-1013">
  <Title>CAPTURING LINGUISTIC GENERALIZATIONS WITH METARULES IN AN ANNOTATED PHRASE-STRUCTURE GRAMMAR</Title>
  <Section position="7" start_page="47" end_page="47" type="ackno">
    <SectionTitle>
9. Conclusions
</SectionTitle>
    <Paragraph position="0"> Metarules, when adapted to work on an APSG representation, are a very powerful tool for specifying generalizations in the grammar. A great deal of care must be exercised in writing metarutes, because it is easy to state generalizations that do not actually hold. Also, the output of metarutes can be used again aS input to the metarules, and this often produces surprising results. Of course, language is complex, and it is to be expected that describing Its generalizations will also be a difficult task.</Paragraph>
    <Paragraph position="1"> The success of the metarule formulation in deriving a small number of new rules comes in part from the Increased definitional power of APSGs over ordinary PSGs. For example, number agreement and feature inheritance can be expressed simply by appropriate annotations in an APSG, but require metarules on PSGs. The definitional compactness of APSGs means that fewer metarules are needed, and hence fewer derived rules are generated.</Paragraph>
  </Section>
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