| http://www.w3.org/ns/prov#value | - As such, each Web page is represented as a feature vector, whose element is a word with its weighting xi=<xi1, xi2 . . . xin> The weighting xij is calculated by length-normalized log(tf).idf, which has the form: idft??1+log???(fd,t)1+log???(avefd)??1avedlb+S??(dlbd-avedlb),
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