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<Paper uid="H86-1001">
  <Title>Research and Development in Natural Language Processing at BBN Laboratories in the Strategic Computing Program</Title>
  <Section position="3" start_page="1" end_page="1" type="intro">
    <SectionTitle>
2 IRUS-86: The Initial Test Bed System
</SectionTitle>
    <Paragraph position="0"> The architecture of IRUS \[Bates 83\] is a cascade consisting of a sequence of  translation modules: o An ATN parser which produces a syntactic tree. o A semantic interpreter which produces a formula of the meaning representation language MRL.</Paragraph>
    <Paragraph position="1"> o A postprocessor for resolving anaphora and ellipsis. o A translation module which produces a formula of the relational data base language ERL (&amp;quot;Extended Relational Language&amp;quot;). o A translation module which produces a sequence of commands for the  underlying data base access system.</Paragraph>
    <Paragraph position="2"> IRUS-86, the version of IRUS which is now installed at the Pacific Fleet Command Center, is a version of IRUS which is extended in several ways. Two of these extensions are especially worth mentioning: o IRUS-86 uses the NIKL system \[Moser 83\] to represent its domain model, i.e., the relationships between the predicates and relations of the meaning representation language MRL. The NIKL domain model supports the system's treatment of semantic anomaly, anaphora, and nominal compounds.</Paragraph>
  </Section>
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