Although there is a great deal of recent research on extracting knowledge from text (Agichtein and Gravano, 2000;Etzioni et al., 2005;Snow et al., 2006;Pantel and Pennacchiotti, 2006;Yates et al., 2007), much less progress has been made on the problem of drawing reliable inferences from this imperfectly extracted knowledge.
traditional logical inference methods are too brittle to be used to make complex inferences from automatically-extracted knowledge, and probabilistic inference methods (Richardson and Domingos, 2006) suffer from scalability problems.