Lexical Rules and Lexical Organization: Productivity in the Lexicon

  • Onur T. Sehitoglu
  • Cem Bozsahin
Part of the Text, Speech and Language Technology book series (TLTB, volume 10)


In this paper we outline a lexical organization for Turkish that makes use of lexical rules for inflections, semantically predictable derivations, and lexical category changes to control the proliferation of lexical entries. Lexical rules handle changes in grammatical roles, enforce type constraints, and control the mapping of subcategorization frames in valencychanging operations. A lexical inheritance hierarchy facilitates the enforcement of type constraints. The resulting grammar architecture has morphology embedded in the lexicon.

The design has been tested as part of an HPSG grammar for Turkish. Rebracketing in compounds and phrasal scope in affixation present formidable difficulties for lexical rules. In terms of performance, run-time execution of the rules seems to be a far better alternative than precompilation. The latter causes exponential growth in the lexicon due to intensive use of inflections and derivations in Turkish.


Lexical Item Lexical Entry Computational Linguistics Categorial Grammar Derivational Morphology 
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

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • Onur T. Sehitoglu
    • 1
  • Cem Bozsahin
    • 1
  1. 1.Department of Computer EngineeringMiddle East Technical UniversityAnkaraTurkey

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