The present invention can be used in a natural language processing system to determine a relationship (such as similarity in meaning) between two textual segments. The relationship can be identified or determined based on logical graphs generated from the textual segments. A relationship between first...http://www.google.com.tw/patents/US6871174?utm_source=gb-gplus-share專利 US6871174 - System and method for matching a textual input to a lexical knowledge base and for utilizing results of that match
