5. The method of claim 4 , wherein applying the excluding rules comprises applying a first set of rules for syntactic phrases that have a role of subjects and applying a second set of rules for syntactic phrases that have a role of objects.
5. The method of claim 4 , wherein applying the excluding rules comprises applying a first set of rules for syntactic phrases that have a role of subjects and applying a second set of rules for syntactic phrases that have a role of objects. 7. The method of claim 5 , wherein applying the second set of rules comprises excluding subject noun phrases which contain non-proper name definite descriptions, excluding noun phrases which contain pronouns, and excluding subject noun phrases which do not appear at the beginning of text.