6. The method of claim 1 further comprising, for each source file in the collection, transforming the respective source file to a respective archive file of a common file type, wherein the respective archive file includes at least all content extracted from the respective source file as tag content.
6. The method of claim 1 further comprising, for each source file in the collection, transforming the respective source file to a respective archive file of a common file type, wherein the respective archive file includes at least all content extracted from the respective source file as tag content. 7. The method of claim 6 wherein the common file type is a text-readable Portable Document Format (PDF).