OPERA is a natural language question answering system allowing the interrogation of a data base consisting of an extensive listing of operas. The linguistic front-end of OPERA is a comprehensive grammar of French, and its semantic component translates the syntactic analysis into logical formulas (first order logic formulas).However there are quite a fiew constructions which can be analysed syntactically in the grammar but for which we are unable to specify translations. Foremost among these are anaphoric and elliptic contructions. Thus this paper describes the extension of OPERA to anaphoric and elliptic constructions on the basis of the Discourse Representation Theory (DRT).
[1]
Naomi Sager,et al.
Natural language information processing
,
1980
.
[2]
Wolfgang Schönfeld,et al.
A Theory for the Representation of Knowledge
,
1986,
IBM J. Res. Dev..
[3]
David H. D. Warren,et al.
An Efficient Easily Adaptable System for Interpreting Natural Language Queries
,
1982,
CL.
[4]
Richard Montague,et al.
The Proper Treatment of Quantification in Ordinary English
,
1973
.
[5]
Morris Salkoff,et al.
Une grammaire en chaîne du français : analyse distributionnelle
,
1973
.