Query-based multilingual opinion mining was addressed in several NTCIR shared tasks (Seki et al., 2007;Seki et al., 2010).
the application of this simple approach to the gold dependency graphs in the training partition of the MPQA leads to oracle F 1 scores of 86.0%, 95.8% and 93.0% in the reconstruction of opinion, agent and target spans, respectively, according to the proportional scores described in §5.2.