10. The system of claim 8 , wherein the first and second textual distances each comprise a sum of values corresponding to intermediary textual elements between the text portion of the document corresponding to the first parameter and the text portions of the document corresponding to the second and third parameters.
11. The system of claim 10 , wherein the intermediary textual elements include at least one word having a first corresponding value in the sum of values and at least one textual element other than a word having a second corresponding value in the sum of values, the second corresponding value being distinct from the first corresponding value.