D-LTAG System: Discourse Parsing with a Lexicalized Tree-Adjoining Grammar

  • Authors:

  • Katherine Forbes;Eleni Miltsakaki;Rashmi Prasad;Anoop Sarkar;Aravind Joshi;Bonnie Webber

  • Affiliations:

  • Institute for Research in Cognitive Science, University of Pennsylvania, 3401 Walnut Street, Suite 400A, Philadelphia, PA 19104, U.S.A. E-mail: forbesk@linc.cis.upenn.edu;Institute for Research in Cognitive Science, University of Pennsylvania, 3401 Walnut Street, Suite 400A, Philadelphia, PA 19104, U.S.A. E-mail: elenimi@linc.cis.upenn.edu;Institute for Research in Cognitive Science, University of Pennsylvania, 3401 Walnut Street, Suite 400A, Philadelphia, PA 19104, U.S.A. E-mail: rjprasad@linc.cis.upenn.edu;School of Computing Science, Simon Fraser University, 8888 University Drive, Burnaby, BC, Canada V5A 1S6. E-mail: anoop@cs.sfu.ca;Institute for Research in Cognitive Science, University of Pennsylvania, 3401 Walnut Street, Suite 400A, Philadelphia, PA 19104, U.S.A. E-mail: joshi@linc.cis.upenn.edu;Division of Informatics, University of Edinburgh, 80 South Bridge, Edinburgh EH1 1HN, Scotland. E-mail: bonnie@inf.ed.ac.uk

  • Venue:
  • Journal of Logic, Language and Information
  • Year:
  • 2003

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Abstract

We present an implementation of a discourse parsing system for alexicalized Tree-Adjoining Grammar for discourse, specifying the integrationof sentence and discourse level processing. Our system is based on theassumption that the compositional aspects of semantics at thediscourse level parallel those at the sentence level. This coupling isachieved by factoring away inferential semantics and anaphoric features ofdiscourse connectives. Computationally, this parallelism is achievedbecause both the sentence and discourse grammar are LTAG-based and the sameparser works at both levels. The approach to an LTAG for discourse has beendeveloped by Webber and colleagues in some recent papers. Our system takes a discourseas input, parses the sentences individually, extracts the basic discourseconstituent units from the sentence derivations, and reparses the discoursewith reference to the discourse grammar while using the same parser usedat the sentence level.