Since our definition of terminology only allows for nouns and numbers, we restrict prediction to words of the corresponding POS tags Q = {CD, NN, NNS, NNP, NNPS} using the Stanford POS tagger (Toutanova et al., 2003).
we assign a POS tag p i to each word from s i and only extract features/predict using the classifier if p i ∈ Q; otherwise we always assign the Outside tag.