Many methods have been proposed for solving this problem by automatically extracting gazetteers from large amounts of texts (Riloff and Jones, 1999;Thelen and Riloff, 2002;Etzioni et al., 2005;Shinzato et al., 2006;Talukdar et al., 2006;Nadeau et al., 2006).
these methods require complicated induction of patterns or statistical methods to extract high-quality gazetteers.