Examples (1) and (2) show two sentences from the MPQA corpus where DSEs  The task of marking up these expressions has usually been approached using straightforward sequence labeling techniques using using simple features in a small contextual window (Choi et al., 2006;Breck et al., 2007).
due to the simplicity of the feature sets, this approach fails to take into account the fact that the semantic and pragmatic interpretation of sentences is not only determined by words but also by syntactic and shallow-semantic relations.