On Tuesday, Mar 16, 2004, at 13:00 America/New_York, Justin Chapweske
> You build your system primarily around a pull-based design so that you
> gain the simplicity and robustness of the pull-based approach.
> Then, you add an optional layer that allows receivers to register with
> the sources for an *unreliable* event notification that the source has
> been updated and should be polled again. By allowing the event
> notification to be unreliable, the system doesn't need to be concerned
> about dealing with failures during event notification.
This pretty well describes the architecture of RSS pings.