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<Paper uid="A92-1030">
  <Title>XTAG - A Graphical Workbench for Developing Tree-Adjoining Grammars*</Title>
  <Section position="6" start_page="227" end_page="228" type="concl">
    <SectionTitle>
6 Conclusion
</SectionTitle>
    <Paragraph position="0"> We described a workbench for the development of tree-adjoining grammars and their parsers and discussed some issues that arise in the design of the graphic interface. null The unique characteristics of tree-adjoining grammars, its elementary objects found in the lexicon (extended trees) and the derivational history of derived 6Newer versions of the system are copied into the same directory as they become available.</Paragraph>
    <Paragraph position="1"> rPrevious releases of X will not work with XTAG. X11R4 is free software available from MIT.</Paragraph>
    <Paragraph position="2">  trees (also a tree), require a specially crafted interface in which the perspective is shifted from a string-based to a tree-based system. XTAG provides such a workbench. null The kernel of XTA G is a predictive left to right parser for unification-based tree-adjoining grammar \[Schabes, 1991\]. XTAG includes a graphical editor for trees, a graphical tree printer based on a new algorithm, utilities for manipulating and displaying feature structures for unification-based tree-adjoining grammar, facilities for keeping track of the derivational history of TAG trees combined with adjoining and substitution, a parser for unification based tree-adjoining grammars, utilities for defining grammars and lexicons for tree-adjoining grammars, a morphological recognizer for English (75 000 stems deriving 280 000 inflected forms) and a tree-adjoining grammar for English that covers a large range of linguistic phenomena.</Paragraph>
    <Paragraph position="3"> XTAG without the large morphological and syntactic lexicons is public domain software. The large morphological and syntactic lexicons can be obtained through an agreement with ACL's Data Collection Initiative.</Paragraph>
    <Paragraph position="4"> XTAG runs under Common Lisp and X Window (CLX).</Paragraph>
  </Section>
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