PARC's Bridge and Question Answering System
Daniel G. Bobrow, Bob Cheslow, Cleo Condoravdi, Lauri
Karttunen, Tracy Holloway King, Rowan Nairn, Valeria de
Paiva, Charlotte Price, and Annie Zaenen
Abstract
This paper describes a system designed to robustly map from natural
language sentences to logical, abstract knowledge representations (the
Bridge system). The system runs on PARC's parser, generator, and
ordered rewrite platform XLE. The Bridge system has been extended to
include a type of light inference, based on an entailment and
contradiction detection algorithm which also runs on XLE. The paper
then describes a search and question answering application Asker which
uses the Bridge system to create a semantic representation that provides the basis for an index of text passages and
which allows a user to query the index in natural language.
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