18. The method of claim 17 , further comprising annotating the document in view of the identified tokens.
17. The method of claim 11 , comprising: evaluating each token against at least 3 different Markov models to determine respective relative probabilities that the token corresponds to the Markov models, at least 2 of the Markov models being directed to terms that are of interest, and at least one of the Markov models being directed to terms that are not of interest; and identifying tokens associated with said at least 2 of the Markov models directed to terms of interest.