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Feature structure
In
phrase structure grammars
, such as
generalised phrase structure grammar
,
head-driven phrase structure grammar
and
lexical functional grammar
, a
feature structure
is essentially a set of
attribute-value pairs
. For example the attribute named
number
might have the value
singular
. The value of an attribute may be either
atomic
, e.g. the symbol
singular
, or complex (most commonly a feature structure, but also a list or a set).
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