Lexicon definition is one of the main bottlenecks in the development of new applications in the field of Information Extraction from text. Generic resources (., lexical databases) are promising for reducing the cost of specific lexica definition, but they introduce lexical ambiguity. This paper proposes a methodology for building application-specific lexica by using WordNet. Lexical ambiguity is kept under control by marking synsets in WordNet with field labels taken from the Dewey Decimal Classification. tion requirement. Unfortunately one of the current trends in IE is the progressive reduction of the size of training corpora: ., from the 1,000 texts.
