Several online RSS service providers (essentially, Web- based RSS readers) have proposed alternative solu- tions [2, 3]. In these “outsourced aggregation” scenar- ios, a centralized service provides a remote procedure interface which end-user applications may be built upon (or refactored to use). Such an application would store all its state—the set of subscribed feeds, the set of “old” and “new” entries—on the central server. It would then poll only this server to receive all updated data. The central RSS aggregation service would take responsibil- ity for polling the authoritative RSS feeds in the wider Internet. This addresses the bandwidth problem, in a way: A web site owner will certainly service fewer RSS requests as.
