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<Paper uid="P05-2026">
  <Title>A Domain-Specific Statistical Surface Realizer</Title>
  <Section position="3" start_page="151" end_page="151" type="intro">
    <SectionTitle>
2 Algorithm
</SectionTitle>
    <Paragraph position="0"> We use dependency tree representations for both the semantics and syntax of a sentence; we introduce the syntactic-semantic (SS) tree to combine information from both of these structures. An SS tree is constructed by &amp;quot;attaching&amp;quot; some of the nodes of a sentence's semantic tree to the nodes of its syntactic tree, obeying two rules:  are attached to two syntactic nodes y</Paragraph>
    <Paragraph position="2"> a descendant of x  in the semantic tree if and only if y  is a descendant of y  in the syntactic tree.</Paragraph>
    <Paragraph position="3"> The nodes of an SS tree are either unattached semantic or syntactic nodes, or else pairs of attached nodes. The SS tree's hierarchy is consistent with the hierarchies in the syntactic and semantic trees. We say that an SS tree T satisfies a semantic structure S if S is embedded in T. This serves as formalization of the idea of a sentence expressing a certain content.</Paragraph>
  </Section>
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