22. The computer-readable medium of claim 21 , wherein each token type is one of an alphabetic type, an alpha-numeric type, or a numeric type.
22. The computer-readable medium of claim 21 , wherein each token type is one of an alphabetic type, an alpha-numeric type, or a numeric type. 23. The computer-readable medium of claim 22 , wherein the token similarity score for each matched token pair is zero for a matched token pair if a first token and a second token of the token pair are of different types.