Previous literature in attribute extraction takes advantage of a range of data sources and extraction procedures (Chklovski and Gil, 2005;Tokunaga et al., 2005;Paşca and Van Durme, 2008;Yoshinaga and Torisawa, 2007;Probst et al., 2007;Wu and Weld, 2008).
these methods do not address the task of determining the level of specificity for each attribute.