For example, event mentions are typically predications that require more complex lexico-semantic processing, and furthermore, the capability of extracting features that characterize them has been available only since semantic parsers based on PropBank (Palmer, Gildea, and Kingsbury 2005) and FrameNet (Baker, Fillmore, and Lowe 1998) corpora have been developed.
entity coreference resolution has been intensively studied and many successful techniques for identifying mention clusters have been developed (Cardie and Wagstaf 1999;Haghighi and Klein 2009;Stoyanov et al.