Abstract
The PRC Adaptive Knowledge-based Text Understanding System (PAKTUS) was developed as an Independent Research and Development project at PRC from 1984 through 1992. It includes a core English lexicon and grammar, a concept network, processes for applying these to lexical, syntactic, semantic, and discourse analysis, and tools that support the adaptation of the generic core to new domains, primarily by acquiring sublanguage and domain-specific lexicon and topic patterns. The lexical, syntactic, and semantic analysis components required little adaptation for MUC-5, the most significant change being conversion of the task-specific semantic representations to object-oriented form. The discourse analysis component was modified to operate on the task-specific semantic structures, rather than the generic case frames.
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