20. The medium of claim 16 , further comprising: modifying the section of content in the electronic document according to the determined one or more updates.
21. The medium of claim 20 , wherein the determined one or more updates include updated price information present in the copy of the source, wherein said modifying the section of content in the electronic document according to the determined one or more updates comprises: updating at least one price indicated in the section of content in the electronic document according to the updated price information.