Using Default Logic for Lexical Knowledge

Lexical knowledge is knowledge about the morphology gram mar and semantics of words This knowledge is increasingly important in language engineering and more generally in information retrieval in formation ltering intelligent agents and knowledge management Here we present a framework based on default logic called Lexica for captur ing lexical knowledge We show how we can use contextual information about a given word to identify relations such as synonyms antinyms specializations and meronyms for the word We also show how we can use machine learning techniques to facilitate engineering a Lexica knowl edgebase