7. The method of claim 6 further comprising the step of calculating the normalized length of the first database set according to the formula: len ⁡ ( s ) = ∑ s i ∈ s ⁢ idf ⁡ ( s i ) 2 wherein: s represents the first database set; len(s) represents the normalized length of the first database set; and, s i represents a specific token in s.
7. The method of claim 6 further comprising the step of calculating the normalized length of the first database set according to the formula: len ⁡ ( s ) = ∑ s i ∈ s ⁢ idf ⁡ ( s i ) 2 wherein: s represents the first database set; len(s) represents the normalized length of the first database set; and, s i represents a specific token in s. 8. The method of claim 7 further comprising the step of calculating the normalized length of the query set according to the formula: len ⁡ ( q ) = ∑ q i ∈ q ⁢ idf ⁡ ( q i ) 2 wherein: q represents the query set; len(q) represents the normalized length of the query set; and, q i represents a specific token in q.