4. The computer-implemented method of claim 1 , wherein the keywords are those n-grams extracted during the filtering process.
4. The computer-implemented method of claim 1 , wherein the keywords are those n-grams extracted during the filtering process. 5. The computer-implemented method of claim 4 , wherein for each subject extracted keyword, a frequency, f, of the subject keyword in the harvested Web documents, and a number of the Web documents, N, that includes the subject keyword are calculated and the phase transition method calculates relevancy of the subject keyword, based on its frequency in the harvested Web documents and the number of Web documents that include the subject keyword.