1. WebRecommender(SearchEngine se) WebRecommender(SearchEngine se) WebRecommender(SearchEngine se) Util StopwordRemover Remove(String s) : String <<interface>> SearchEngine Search(Query q) : List<Page> StructureFeatureRecommender Recommend(Page p): List<Page> SemanticFeatureRecommender Recommend(Page p): List<Page> YahooSearch Search(Query q) : List<Page> BasicRecommender Recommend(Page p): List<Page> <<interface>> WebRecommender Recommend(Page p): List<Page> GoogleSearch Search(Query q) : List<Page> <<interface>> QueryFormulator And(Query q1, Query q2) : Query Or(Query q1, Query q2) : Query QueryFormulator1 And(Query q1, Query q2) : Query Or(Query q1, Query q2) : Query Stemmer Stem(String s) : String HTMLStripper Strip(Page p) : String HTMLParser Parse(Page p) : ParseTree <<interface>> QueryTermFilter FilterQueryTerms(List<String> keyTerms) : List<String> TFIDFQueryTermFilter FilterQueryTerms(List<String> keyTerms) : List<String>