... re-call of 55.1%, a precision of 71.9% and a resultingF-measure of 62.4% for the detection of the classnonreferential. The overall classification accuracywas 75.1%. The advantage of using ... otherthings, information about the parts of speech and lemmata of words in the context of it (obtained au-tomatically). Other features encode the presenceor absence of, resp. the distance to, certain ... categories, and adecision tree diagram. The diagram told them e.g.to use wh-question formation as a test to distin-guish extrapos it and prop-it on the one handfrom normal and vague on the other. The...