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Below we describe the winning system that we built for the KDD Cup 2002 Task 1 competition. Our system is a Rule-based Information Extraction (IE) system. It combines pattern matching, Natural Language Processing (NLP) tools, semantic constraints based on the domain and the specific task, and a post-processing stage for making the final curation decision based on the various evidence (positive and negative) found within the document. Development and implementation were made using the DIAL IE language and the ClearLab development environment. The results achieved were significantly superior than those achieved using categorization approaches.
Regev et al. (Sun,) studied this question.