3[3]Berners-Lee T.Semantic web road map[EB/OL].Internal note WorldWideWebConsortium.http://www.w3.org/DesignIssues/Semantic.html,1998-09.
4[6]Robertson S.Sparck Jones Relevance weighting of search terms,Journal of American Society for Information Science,1976; 27 (3):129-146
5[7]Sal tonqYang C,Wong A.A vector-space model for automatic indexing,Communications of the ACM,1975; 18(11):613-620
6[8]Han E -h,Boley D,ginim,Gross R.Document categorization and query generation on the world wide Web using Web ACE.Journal of artificial Intelligence Review,1999; (3):365-391