For the special case of Rote extractors, a more attractive alternative has been proposed by Brin (1998), Agichtein and Gravano (2000), and Ravichandran and Hovy (2002).
essentially, for any text snippet of the form A 1 pA 2 qA 3 , these systems estimate the probability that a relationship r(p, q) holds between entities p and q, given the interstitial context, as 2 the probability of a relationship r(p, q) is the number of times that pattern xA 2 y predicts any relationship r(x, y) in the training set T .