A method for storing input information in an information retrieval system database wherein a plurality of information subject categories are provided. A plurality of subject lexicons are provided, each subject lexicon of the plurality of subject lexicons corresponding to an information...http://www.google.ca/patents/US5717914?utm_source=gb-gplus-sharePatent US5717914 - Method for categorizing documents into subjects using relevance normalization for documents retrieved from an information retrieval system in response to a query 
