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A Natural Language Toolkit: Reconciling Theory with Practice

  • Branimir Boguraev
Part of the Studies in Linguistics and Philosophy book series (SLAP, volume 35)

Abstract

Generalized Phrase Structure Grammar (GPSG) is a highly restrictive theory of natural language syntax, characterised by complex interaction between its various rule types and constraints. Motivated by desire for declarative semantics, the theory defines these as applying simultaneously in the process of licensing local trees. As a result, as far as practical implementations of GPSG are concerned, the theory loses its apparent efficient parsability and becomes computationally intractable. This paper describes one aspect of an UK collaborative effort to produce a general purpose morphological and syntactic analyser for English within the theoretical framework of Generalized Phrase Structure Grammar, namely the development of a tractable grammatical formalism with clear semantics, capable of supporting the task of writing a substantial grammar. The paper outlines the intellectual and pragmatic background of the development effort and traces the incremental evolution of this formalism, following discussions concerning the fundamental issues of rules interpretation, feature system, grammar organisation, parser strategy, environment for grammar writing and support, and the construction of a lexicon linked to the grammar. Particular emphasis is placed on the quesiton of how theoretical standpoints have been reconciled with practical constraints, and how the commitment to deliver a functional morphological and syntactic analyser of wide scope and coverage of English has influenced the current state of the grammatical formalism.

Keywords

Lexical Entry Computational Linguistics Default Rule Grammar Formalism Phrase Structure Grammar 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company 1988

Authors and Affiliations

  • Branimir Boguraev
    • 1
  1. 1.Computer LaboratoryUniversity of CambridgeCambridgeEngland

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