Many approaches have been used in DP, the majority of them using machine learning algorithms, such as probabilistic models<cite> (Soricut and Marcu, 2003)</cite> , SVMs (Reitter, 2003; duVerle and Prendinger, 2009; Hernault et al., 2010; Feng and Hirst, 2012) and dynamic conditional random field (Joty et al., 2012) .