Thus, in section 2.3, for comparison with reported results in <cite>Sporleder and Lapata (2005)</cite> , our F1-score is defined accordingly, i.e., seg- mentation boundaries j such that 0 ≤ j < k. In addition, we will report unlabeled bracketing precision, recall and F1-score, as defined in the PARSEVAL metrics (Black et al., 1991) and evaluated via the widely used evalb package.