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Name

mod_changedpage

Synopsis

mod_changedpage does for RSS 1.0 what the cloud element does for RSS 0.9x: it introduces a form of Publish and Subscribe. We’ll discuss Publish and Subscribe in detail in Chapter 9, but basically it enables a system in which you can “subscribe” to a feed and be notified when something new is published.

mod_changedpage uses only one element, which points to a changedPage server . Users wishing to be told when the feed has updated send an HTTP POST request of a certain format to this server. Upon updating, this server sends a similar POST request back to the user. The user’s client then knows about the update. Again, Chapter 9 examines this in detail.


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