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<Paper uid="W96-0513">
  <Title>Multilinguality and Reversibility in Computational Semantic Lexicons</Title>
  <Section position="2" start_page="51" end_page="51" type="ackno">
    <SectionTitle>
READ
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    <Paragraph position="0"> AGENT: VARi = HUMAN THEME: VAR2 = BOOK  We can then use the reversed lexicon to generate sentences that conform to the given syn-struc but substitute appropriate words or phrases in place of the variables. Sentences such as the following would signal problems: The book read John.</Paragraph>
    <Paragraph position="1"> John read into the book.</Paragraph>
    <Paragraph position="2"> John read the cheese.</Paragraph>
    <Paragraph position="3"> This is especially helpful for automatically generated lexicon entries such as nominalisations, which are created from verbal entries using lexical rules. Many thousands of such entries have been created; tools such as this provide a simple way to check their accuracy. Conclusion In this paper we argued that, although lexicographic and statistical approaches have their place in natural language processing, computational semantic lexicons are necessary for a wide range of phenomena and are applicable to a number of purposes. Unfortunately, large-scale acquisition of computational lexicons is difficult. Compounding this problem is the fact that analysis systems require different information than generation lexicons.</Paragraph>
    <Paragraph position="4"> We have developed a method that enables us to take advantage of the large investment made in the Mikrokosmos analysis lexicon. We outlined a relatively simple process for reversing analysis lexicons for eventual use in generation. This process transfers relevant information and re-indexes it according to the needs of generation. The process is not perfect; some information required in generation, such as collocational constraints, is not typically recorded in analysis lexicons. Nevertheless, the methods described here provide a baseline to which additional information can be added.</Paragraph>
    <Paragraph position="5"> Creating these reversed lexicons has produced a number of additional advantages beyond those originally envisioned, mostly in the area of testing and evaluating the semantic analysis system. By back-translating the results of semantic analysis, evaluation is simplified. Testing the content of individual lexicon entries can also be made easier by generating sample sentences that conform to them. And finally, theoretical issues concerning the content of analysis lexicons, generation lexicons and the text meaning representation language can be more fully investigated.</Paragraph>
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