... types of features include contextual (Lin, 1998), co-occurrence (Yang and Callan, 2008), and syntactic dependency (Pantel and Lin, 2002; Pantel and Ravichandran, 2004). So far there is no systematic ... pattern-based approaches include question-answer relations (such as birthdates and inven-tor) (Ravichandran and Hovy, 2002), synonyms and antonyms (Lin et al., 2003), general purpose analogy (Turney ... Ra-vichandran and Hovy, 2002; Pantel and Pennac-chiotti, 2006). It utilizes a few man-crafted seed patterns to extract instances from corpora, then extracts new patterns using these instances, and...