input: [0] 4. [Event] The owner of the Yahoo Financial RSS mashable changes the cache expiration period for this mashable to 1 minute. Within seconds UserA adds a filter block to his mashup, connects the Yahoo Financial block and previews the result of the filter. [Cache Entry] 
output: The existing cache entry for Yahoo Financial is used as the input to the filter block. This cache entry will remain for the full 5 minutes and then expire. All subsequent responses for the Yahoo Financial mashable will use a 1 minute expiration period.