14. The method of claim 1 wherein the initially and subsequently processings individually comprise identifying the features present in respective ones of the initial documents and the subsequent documents.
14. The method of claim 1 wherein the initially and subsequently processings individually comprise identifying the features present in respective ones of the initial documents and the subsequent documents. 15. The method of claim 14 wherein the initial documents are not processed again to identify the features present in the initial documents after the initially processing.