Context-Free grammar rewriting and the transfer of packed linguistic representations

  • Authors:
  • Marc Dymetman;Frédéric Tendeau

  • Affiliations:
  • Xerox Research Centre Europe, Meylan, France;Lernout & Hauspie, Wemmel, Belgium

  • Venue:
  • COLING '00 Proceedings of the 18th conference on Computational linguistics - Volume 2
  • Year:
  • 2000

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Abstract

We propose an algorithm for the trausfer of packed linguistic structures, that is, finite collections of labelled graphs which share certain subparts. A labelled graph is seen as a word over a vocabulary of description elements (nodes, arcs, labels), and a collection of graphs as a set of such words, that is, as a language over description elements. A packed representation for the collection of graphs is then viewed as a context-free grammar which generates such a language. We present an algorithm that uses a conventional set of transfer rules but is capable of rewriting the CFG representing the source packed structure into a CFG representing the target packed structure that preserves the compaction properties of the source CFG.