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<Paper uid="A94-1042">
  <Title>Guided Sentences Composition for Disabled People</Title>
  <Section position="3" start_page="0" end_page="205" type="intro">
    <SectionTitle>
2 ILLICO
</SectionTitle>
    <Paragraph position="0"> In our approach, knowledge is separated into four distinct modules : - a set of lexical rules (the lexicon) specifies expected words and expressions ; - in a restricted version of the Metamorphosis Grammar formalism (Colmerauer, 1975), a set of syntactic rules (the grammar) defines expected structures of sentences and grammatical agreements ; - by means of lambda-expressions operating on the semantic representation associated with relevant syntactic categories, a set of semantic rules allows the production of semantic representations ; - a set of conceptual rules (the conceptual model) defines domain constraints and connectivity constraints (Godbert et al., 1993).</Paragraph>
    <Paragraph position="1"> The algorithm for coroutining the treatment of the different kinds of knowledge in order to avoid dead ends along the guided composition mode is described in (Milhaud et al., 1992).</Paragraph>
    <Paragraph position="2"> Our approach has led us to develop in Prolog a software, ILLICO, allowing for the conception of natural language interfaces with guided sentences  composition. The following figure illustrates general principle of the approach.</Paragraph>
  </Section>
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