Equipped with suitable indices, a catalog and an annotated corpus let us find "scientists who played some musical instrument", and answer many other powerful classes of queries (Li et al., 2010;Sawant and Chakrabarti, 2013).
accurate corpus annotation has been intensely investigated (Mihalcea and Csomai, 2007;Cucerzan, 2007;Milne and Witten, 2008;Kulkarni et al., 2009;Han et al., 2011;Ratinov et al., 2011;Hoffart et al., 2011).