TIMEX2 1 and TimeML 2 ), publicly available annotated corpora (ACE, 3 TimeBank 4 ) and a number of automatic taggers (see, for example, (Mani and Wilson, 2000;Schilder, 2004;Hacioglu et al., 2005;Negri and Marseglia, 2005;Saquete, 2005;Han et al., 2006;Ahn et al., 2007)).
existing corpora have their limitations.