The results of recent studies, as reported in Section 2.2, seem to show that current resolution of discourse references in RTE systems hardly affects performance.
our intuition is that these results can be attributed to four major limitations shared by these studies: (1) the datasets, where discourse phenomena were not well repre-sented; (2) the off-the-shelf coreference resolution systems which may have been not robust enough; (3) the limitation to nominal coreference; and (4) overly simple integration of reference information into the inference engines.