Traditionally, event extraction has focused on monolingual training -typically English (Grishman et al., 2005;Ji and Grishman, 2008;Gupta and Ji, 2009;Liao and Grishman, 2010;Liao and Grishman, 2011;Li et al., 2013;Bronstein et al., 2015), and occasionally Chinese or other languages (Chen and Ji, 2009b;Piskorski et al., 2011;Li et al., 2012;Chen and Ng, 2012;Chen and Ng, 2014).
the ACE ontology contains 35 different argument types, and we also include the NONE label to indicate when there is no relationship between the trigger and the entity.