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Head-driven phrase structure grammar
Head-driven phrase structure grammar
(
HPSG
) is a highly lexicalized, non-derivational
generative grammar
theory developed by
Carl Pollard
and
Ivan Sag
. It is a type of
phrase structure grammar
, as opposed to a
dependency grammar
, and it is the immediate successor to
generalized phrase structure grammar
. HPSG draws from other fields such as
computer science
(
data type theory
and
knowledge representation
) and uses
Ferdinand de Saussure
's notion of the
sign
. It uses a uniform formalism and is organized in a modular way which makes it attractive for
natural language processing
.
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