14. The apparatus as set forth in claim 11 , wherein the selecting of a table of contents includes: determining a plurality of textual similarity links associating pairs of text fragments, at least some text fragments being included in more than one link; determining a plurality of candidate tables of contents each defined by a contiguous sub-sequence of the ordered sequence of text fragments and each having at least one combination of links satisfying criteria (i), (ii), (iii); ranking each candidate table of contents based on the textual similarity links having source text fragments contained in the candidate table of contents; choosing the highest ranked candidate tables of contents as the table of contents; and optimizing the plurality of textual similarity links having source text fragments contained in the table of contents to select no more than a single link for each entry, the optimizing satisfying criteria (i), (ii), and (iii).
14. The apparatus as set forth in claim 11 , wherein the selecting of a table of contents includes: determining a plurality of textual similarity links associating pairs of text fragments, at least some text fragments being included in more than one link; determining a plurality of candidate tables of contents each defined by a contiguous sub-sequence of the ordered sequence of text fragments and each having at least one combination of links satisfying criteria (i), (ii), (iii); ranking each candidate table of contents based on the textual similarity links having source text fragments contained in the candidate table of contents; choosing the highest ranked candidate tables of contents as the table of contents; and optimizing the plurality of textual similarity links having source text fragments contained in the table of contents to select no more than a single link for each entry, the optimizing satisfying criteria (i), (ii), and (iii). 15. The apparatus as set forth in claim 14 , wherein the determining of textual similarity links includes: tokenizing the text fragments; quantitatively comparing tokens of pairs of text fragments; identifying a pair of text fragments as linked conditional upon the quantitative comparing exceeding a selected threshold.