Parsing with Typed Feature Structures

Shuly Wintner, Nissim Francez

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


In this paper we provide for parsing with respect to grammars expressed in a general TFS-based formalism, a restriction of ALE. Our motivation being the design of an abstract (WAM-like) machine for the formalism, we consider parsing as a computational process and use it as an operational semantics to guide the design of the control structures for the abstract machine. We emphasize the notion of abstract typed feature structures (AFSs) that encode the essential information of TFSs and define unification over AFSs rather than over TFSs. We then introduce an explicit construct of multi-rooted feature structures (MRSs) that naturally extend TFSs and use them to represent phrasal signs as well as grammar rules. We also employ abstractions of MRSs and give the mathematical foundations needed for manipulating them. We then present a simple bottom-up chart parser as a model for computation: grammars written in the TFS-based formalism are executed by the parser. Finally, we show that the parser is correct.
Original languageEnglish
Title of host publicationProceedings of the Fourth International Workshop on Parsing Technologies
StatePublished - 31 Jan 1996
Externally publishedYes

Bibliographical note

PostScript, 15 pages; Proc. 4th Intl. Workshop on Parsing Technologies, Prague, September 1995


  • cmp-lg
  • cs.CL


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