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<Paper uid="W94-0301">
  <Title>Discovery and Format of Input Structures for Tactical Generation</Title>
  <Section position="2" start_page="0" end_page="0" type="intro">
    <SectionTitle>
INTRODUCTION
</SectionTitle>
    <Paragraph position="0"> Our concern here is with the proper composition and form of the structures which serve as the output of strategic generation and the input to tactical generation -- that is, as the interface between these processes. We take discourse relations (essentially semantic recta-relations) and &amp;quot;rhetorical types&amp;quot; (pragmatic objects similar to speech acts) to be major elements of tactical input. Our brief is that these should be discovered via judgments of synonymy, and should be arranged in networks or lattices rather than exclusively in hierarchies.</Paragraph>
    <Paragraph position="1"> Section 1 motivates and describes a paraphrase-oriented discovery method based on a suggestion by \[Ivir et al 1973\] and compares it with a similar proposal \[Knott and Dale 1992\]. Section 2 discusses rhetorical types and their discovery. Section 3 compares the paraphrase-based point of view with that of theories in the style of RST which concentrate on elucidating the speaker's underlying rhetorical goals. A general theme will be that much information concerning rhetorical goals and strategy should remain beyond the view of tactical generation programs.</Paragraph>
    <Paragraph position="2"> Section 4 defends the departure from strict hierarchy in our discourse networks. Finally, section 5 proposes a complete lattice as tactical generation input for a paragraph-length discourse studied by \[Mann and Thompson 1983, 1984, 1985\] and gives one example of an alternate version which could be generated. The discourse relations and rhetorical types we feel are needed to generate this discourse are listed in an Appendix I. Each is accompanied by several possible expressive structures.</Paragraph>
    <Paragraph position="3"> We will be describing no particular programs or processes.</Paragraph>
    <Paragraph position="4"> We are concerned with strategic programs only in attempting to influence their final output. Concerning tactical generation procedures suitable for expressing the lattice of Section 5, see \[Seligman 1991\] .</Paragraph>
  </Section>
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