Lexicalised features take into account the quality of lexical alignment, by weighting each rectangle (s 1 , s 2 , t 1 , t 2 ) by a probability of aligning s 1 to t 1 and s The Label-Specific features take into account the nature of the aligned dependencies.
the rectangles of the form ((s1, subj, s2), (t1, subj, t2)) will get more weight than a rectangle ((s1, subj, s2), (t1, nmod, t2)).