The present invention is a method for operating a computer system to retrieve information from a computer database. This method decomposes documents from the database into subdocuments and then inverts the database. Also, a query for retrieving documents from a database is decomposed into terms. The...http://www.google.com.tw/patents/US6278990?utm_source=gb-gplus-share專利 US6278990 - Sort system for text retrieval
