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Open-domain textual question answering techniques

Published online by Cambridge University Press:  14 August 2003

SANDA M. HARABAGIU
Affiliation:
Department of Computer Science, University of Texas at Dallas, Richardson, TX 75083, USA (e-mail: [email protected])
STEVEN J. MAIORANO
Affiliation:
Department of Computer Science, University of Sheffield, Sheffield S1 4DP, UK
MARIUS A. PAŞCA
Affiliation:
Language Computer Corporation, Dallas, TX 75206, USA (e-mail: [email protected])

Abstract

Textual question answering is a technique of extracting a sentence or text snippet from a document or document collection that responds directly to a query. Open-domain textual question answering presupposes that questions are natural and unrestricted with respect to topic. The question answering (Q/A) techniques, as embodied in today's systems, can be roughly divided into two types: (1) techniques for Information Seeking (IS), which localize the answer in vast document collections; and (2) techniques for Reading Comprehension (RC) that answer a series of questions related to a given document. Although these two types of techniques and systems are different, it is desirable to combine them for enabling more advanced forms of Q/A. This paper discusses an approach that successfully enhanced an existing IS system with RC capabilities. This enhancement is important because advanced Q/A, as exemplified by the ARDA AQUAINT program, is moving towards Q/A systems that incorporate semantic and pragmatic knowledge enabling dialogue-based Q/A. Because today's RC systems involve a short series of questions in context, they represent a rudimentary form of interactive Q/A which constitutes a possible foundation for more advanced forms of dialogue-based Q/A.

Type
Papers
Copyright
2003 Cambridge University Press

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