an SCFG) which annotates the nonterminals with headwords.
such a headlexicalized stochastic grammar does not capture dependencies between nonheadwords (such as more and than in the WSJ construction carry more people than cargo where neither more nor than are headwords of the NP-constituent more people than cargo) , whereas a frontier-lexicalized DOP model using large subtrees does capture these dependencies since it includes subtrees in which e.g.