The axiom parsing component uses a few content-based features, such as span similarity and number of relations, span lengths, and relative position; and various discourse features, such as discourse markers, punctuations, text organization, RST parse, an existing discourse segmentor from Soricut and Marcu (Soricut and Marcu 2003), node attachment, syntax, dominance, and XML structure; and all are clearly important.
we can observe that span similarity and punctuation features contribute most to the performance of the model.