Evènement pour le groupe Séminaire Linguistique et Informatique

Date 2008-03-10  15:00-17:00
TitreLexical Resource Semantics: Combinatorics, Selection, and Computation 
RésuméLexical Resource Semantics (LRS) is a framework for integrating logical semantic representations with a constraint-based theory of grammar. It combines semantic representations in the tradition of Montague grammar with grammar specification techniques from Head-driven Phrase Structure Grammar. To derive the semantics of phrases from the semantics of their daughters, LRS does not use the lambda calculus, although its semantic representations are based on higher order logic, and lambda operators are available for specifying meaning representations. Instead of using the lambda calculus, the semantic combinatorics emerges from a small number of grammatical principles which impose constraints on various semantic attribute values of phrases depending on the values of corresponding attribute values at their syntactic daughters. As a result of constraint interaction, each utterance contains a logical formula of two-sorted type theory (Ty2, Gallin 1975) as value of a distinguished semantics attribute. This formula specifies the meaning of of the utterance. In case an utterance is ambiguous, the denotation of the HPSG grammar contains models of the utterance which may be syntactically isomorphic and differ only with respect to different formulae in the distinguished semantics attribute. In this talk I will outline the LRS architecture with particular emphasis on the combinatorial system and the ways in which lexical items select semantic features of their arguments. I will then explain how LRS grammars can be implemented in an extension of a constraint logic programming system for HPSG grammars (TRALE). This will be illustrated with a small fragment of English modelled after the grammar of Pollard and Sag (1994), augmented with an LRS module. The talk does not presuppose in-depth knowledge of HPSG or Ty2. However, a certain degree of familiarity with the use of higher order logic in semantic theories of natural languages and with a grammar framework with a rich feature system (such as LFG or a version of Tree Adjoining Grammar with feature structures) would be useful. If you would like to prepare for the talk, you might want to take a brief look at the LRS sections of Richter & Kallmeyer (2007), 'Feature logic-based semantic composition: A comparison between LRS and LTAG', available from www.sfs.uni-tuebingen.de/~fr/current/richterkallmeyer.pdf 
LieuSalle 076 
OrateurFrank Richter 
UrlUniversité de Tübingen 

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