3. The method of claim 2 , wherein the meta-level features comprise one of a location of the question and answer pair, relation of the question and answer pair to another question and answer pair of the plurality of question and answer pairs, and a relevant named entity.
2. The method of claim 1 , the generating meta-level features further comprising: resolving, by the web server, a pronominal anaphora of the question and answer pair using question and answer pairs listed on the web page preceding the question and answer pair.