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<Paper uid="C92-2083">
  <Title>Structural Patterns vs. String Palterns for Extracting Semantic Information from Dictionari~</Title>
  <Section position="5" start_page="0" end_page="0" type="concl">
    <SectionTitle>
6. Conclusion
</SectionTitle>
    <Paragraph position="0"> Viewed ideally, the choice between structural patterns and string patterns is obviously in favor of structural patterns, because they are more suitable for achieving accuracy in the extraction of semantic information from dictionaries.</Paragraph>
    <Paragraph position="1"> Controversy rises only when considering the reliability of parsing the dictionary definitions themselves. In this paper, we show the feasibility of applying structural patterns to parsed definitions in order to extract semantic information from dictionaries, with the goal of deriving and making explicit the basic general knowledge implicitly stored in any standard printed dictionary. Structural patterns, much more than string patterns, provide the rich semantic information that makes the lexicon a relational network expanding in ndimensions. Not only semantic features or relations directly related to the definiendum are extracted, but also further specifications of the words extracted as values of semantic features or relations.</Paragraph>
    <Paragraph position="2"> We have also described a robust procedure for extracting this semantic information. The syntactic analysis of the definition text provided by a general text parser is evaluated automatically and, if necessary, a post-process applies 1o refine the parse given the context of a dictionary, The results of the structural patterns are differentiated according to the success of the parse. In this way, the use of a grammar improves the quality and the reliability of the semantic information extracted.</Paragraph>
    <Paragraph position="3"> Note For the specific concerns of the Italian Academy, Vanderwende is responsible for sections 1-3 and the English part of section 4, and Montemagni is responsible for the Italian part of section 4 and sections 5-6.</Paragraph>
  </Section>
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