Even methods using queries as a textual data source still extract class labels from documents using the same extraction patterns (Paşca, 2010).
from the point of view of evaluating class labels, run R dc is a valid representative of previous extraction methods, including (Etzioni et al., 2005;Kozareva et al., 2008;Van Durme and Paşca, 2008;Paşca, 2010;Wu et al., 2012).