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Research Paper #846

Title:Time, Tense and Aspect in Natural Language Database Interfaces
Authors:Androutsopoulos,I; Ritchie,GD; Thanisch,P
Date:Mar 1997
Presented:Submitted to the Journal of Natural Language Engineering
Abstract:Most existing natural language database interfaces (NLDBs) were designed to be used with database systems that provide very limited facilities for manipulating time-dependent data, and they do not support adequately temporal linguistic mechanisms (verb tenses, temporal adverbials, temporal subordinate clauses, etc.). The database community is becoming increasingly interested in temporal database systems, that are intended to store and manipulate in a principled manner information not only about the present, but also about the past and future. When interfacing to temporal databases, supporting temporal linguistic mechanisms becomes crucial. We present a framework for constructing natural language interfaces for temporal databases (NLTDBs), that darws on research in tense and aspect theories, temporal logics, and temporal databases. The framework consists of a temporal intermediate representation language called TOP, and HPSG grammar that maps a wide range of questions involving temporal mechanisms to appropriate TOP expressions, and a probably correct method for translating from TOP to TSQL2, TSQL2 being a recently proposed temporal extension of the SQL database language. This framework was employed to implement a prototype NLTDB.

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