Integrating elliptic conjunctions into a CCG based parser
Tilman Vierhuff, Sabine Heidenreich and Bernd
Hildebrandt
Abstract
The variant of Steedman's Combinatory Categorial Grammar uesd in the
Collaborative Research Center 360 "Situated Artifical Communicators"
allows efficient and incremental processing of German instructions for
a cognitive robotics system. This paper introduces the grammar
formalism and elaborates on the rules Steedman suggested for inclusion
of coordinating constructs. It is shown that several instances of
coordination rules are needed in order to capture different phenomena
of coordination.
The traditional unification mechanism prevailing in contemporary
computational linguistics and also used in the SFB 360 is incapable
of coping with elliptic coordination. We will show that the
introduction of directional information flow overcomes this problem
without sacrificing the descriptive potential of unification. Additionally,
a limited short-term memory is integrated into the parser which allows
for processing of many different elliptic sentences.
Postscript-File (~87 k)
Anke Weinberger,
2001-11-22, 2002-01-10