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An Introduction to Unification-Based Approaches to Grammar
These notes discuss a particular approach to encoding linguistic information, both syntactic and semantic, which has been called “unification-based” or
“complex-feature-based.” The term “unification-based grammar formalism”
covers quite a variety of formal devices, which have been developed along
historically different paths. The fact that they are regarded as a group is due
perhaps partly to accidental and historical circumstances, partly to a shared
underlying view of grammar, but most importantly to their reliance in some
way on one particular device—unification.
Historically, these grammar formalisms are the result of separate research
in computational linguistics, formal linguistics, and natural-language processing; related techniques can be found in theorem proving, knowledge representation research, and theory of data types. Several independently initiated
strains of research have converged on the idea of unification to control the flow
of information.
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