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<Paper uid="W91-0111">
  <Title>COMMON HEURISTICS FOR PARSING, GENERATION, AND WHATEVER...</Title>
  <Section position="8" start_page="89" end_page="90" type="concl">
    <SectionTitle>
6 Concluding Remarks
</SectionTitle>
    <Paragraph position="0"> We have introduced a set of general heuristics for controlling symbolic computation on logic constraints, and demonstrated that sentence parsing and generation are attributed to these heuristics. In the above presentation, parsing is for the most part based on truth maintenance (resolution of dependencies among arguments)  controlled by heuristics (H1) and (H2), whereas generation is more dependent on goal satisfaction controlled by (H3) and (H4). In more realistic cases, however.</Paragraph>
    <Paragraph position="1"> both processes would involve both kinds of computation in a more intertwined way.</Paragraph>
    <Paragraph position="2"> A related nice feature of our framework is that, in principle, all the types of constraints -- syntactic, semantic, pragmatic and extralinguistic -- are treated uniformly and integrated naturally, though a really efficient implementation of such an integrated system requires further research. In this connection, we have undertaken to study how to implement the above heuristics in a more principled and flexible way, based on a notion of potential energy \[4\], but the present paper lacks the space for discussing the details.</Paragraph>
    <Paragraph position="3"> In this paper we have discussed only task-independent aspects of control heuristics. Our conjecture is that we will be able to dispense with domain-dependent and task-dependent control heuristics altogether. The domain/task-dependent characteristics of information processing will be captured in terms of the assignment of energy functions to the relevant constraints. The resulting system will still be free from stipulation of the directions of information flow, allowing multi-directional information processing, since neither the symbolic component nor the analog component (that is, energy) of the constraint refers explicitly to information flow.</Paragraph>
  </Section>
class="xml-element"></Paper>