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<Paper uid="C90-3080">
  <Title>QPATR and Constraint Threading</Title>
  <Section position="6" start_page="383" end_page="383" type="concl">
    <SectionTitle>
7 Lexlcal Prediction
</SectionTitle>
    <Paragraph position="0"> QPATR includes a facility of prediction whereby FSMs are proposed for new lexical items encountered in input but not contained in the lexicon. Predictions are made on tim basis of contextual infomaation coUoeted during the analysis of input. A ftmdamental distinction is made between open and closed lexical categories, and dds inl'ormation must be represented with definitions of con'esponding nmcros in the grammar. These definitions may refer to semantic as well as syntactic categorial information. A prediction is blocked if the proposed FSM does not match an open lexical class or if it is described by an entry already in the lexicon, but FSMs may be constructed tbr new lexieal items having homonyms in the lexicon. The definition of open is not used actively to propose an FSM but rather passively to test rite admissibility of an FSM already constructed from the context.</Paragraph>
  </Section>
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