As a baseline, we used the original candidate sentences generated by MEAD.
we have complemented this parser with three other approaches: (Jindal and Liu, 2006)'s approach is used to identify intra-sentence comparison relations; we have designed a tagger based on (Fei et al., 2008)'s approach to identify topicopinion relations; and we have proposed a new approach to tag attributive relations (Mithun, 2012).