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<Paper uid="P92-1050">
  <Title>THE EXPRESSION OF LOCAL RHETORICAL RELATIONS IN INSTRUCTIONAL TEXT*</Title>
  <Section position="9" start_page="319" end_page="320" type="concl">
    <SectionTitle>
IMPLEMENTING
ALTERNATIONS
</SectionTitle>
    <Paragraph position="0"> This analysis of local rhetorical relations has resulted in a set of interrelated alternations, such as those just discussed, which I have formalized in terms of system networks from systemic-functional grammar (Halliday, 1976) 3.</Paragraph>
    <Paragraph position="1"> I am currently implementing these networks as an extension to the Penman text generation architecture (Mann, 1985), using the existing Penman system network tools. My system, called IMAGENE, takes a non-linguistic process structure such as that produced by a typical planner and uses the networks just discussed to determine the form of the rhetorical relations based on functional factors. It then uses the existing Penman networks for lower level clause'generation.</Paragraph>
    <Paragraph position="2"> IMAGENE starts by building a structure based on the actions in the process structure that are to be expressed and then passes over it a number of times making changes as dictated by the system networks for rhetorical structure. These changes, including various rhetorical demotions, marking nodes with their appropriate forms, ordering of clauses/phrases, and clause combining, are implemented as systemic-type realization statements for text. IMAGENE finally traverses the completed structure, calling Penman once for each group of nodes that constitute a sentence. A detailed discussion of this design can be found in Vander Linden (1992b). IMAGENE is capable, consequently, of producing instructional text that conforms to a formal, corpus-based notion of how realistic instructional text is constructed.</Paragraph>
    <Paragraph position="3"> 3System networks are decision structures in the form of directed acyclic graphs, where each decision point represents a system that addresses one of the alternations.</Paragraph>
  </Section>
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