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Summary: In Proceedings of the Fourteenth International Joint Conference on Arti cial Intelligence IJCAI '95
CRYSTAL: Inducing a
Conceptual Dictionary
Stephen Soderland, David Fisher,
Jonathan Aseltine, Wendy Lehnert
Department of Computer Science
University of Massachusetts, Amherst, MA 01003-4610
fsoderlan d sher aseltine lehnertg@cs.umass.edu
Abstract
One of the central knowledge sources of an in-
formation extraction IE system is a dictio-
nary of linguistic patterns that can be used
to identify references to relevant information
in a text. Automatic creation of conceptual
dictionaries is important for portability and
scalability of an IE system. This paper de-
scribes CRYSTAL, a system which automat-
ically induces a dictionary of concept-node
de nitions" su cient to identify relevant in-
formation from a training corpus. Each of
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