University of Massachusetts: description of the CIRCUS system as used for MUC-4
نویسندگان
چکیده
CIRCUS uses no syntactic grammar and produces no parse tree as it analyzes a sentence . Rather, it uses lexically-indexed syntactic knowledge to segment incoming text into noun phrases, prepositional phrases, and ver b phrases. These constituents are stored in global buffers that track the subjects, verbs, direct objects, and prepositiona l phrases of a sentence. Because we restrict the buffer contents to simple constituents with a highly local sense of th e sentence, larger constituents like clauses are not explicitly stored by the syntactic component of CIRCUS .
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