However, recent work has drawn attention to the fact that the specific formalism for which these results were obtained, and which we will refer to as VW-CCG (after Vijay-Shanker and Weir), differs from contemporary versions of CCG in several important aspects.
it allows one to restrict and even ban the use of combinatory rules on a per-grammar basis, whereas modern CCG postulates one universal set of rules, controlled by a fully lexicalized mechanism based on typed slashes, as in other approaches to categorial grammar (Baldridge 2002;Steedman and Baldridge 2011).