XMPP has a Publish-Subscribe capability, generally referred to as PubSub, which many XMPP experts see as very important.

A new white paper on the Isode website seeks to explain PubSub and its significance to non-experts. It also looks at the problems addressed by publish-subscribe systems, shows how XMPP PubSub has been used by two services (Collecta and buddycloud), discusses PubSub capabilities & potential applications and outlines M-Link’s PubSub support.

This whitepaper can be found at http://www.isode.com/whitepapers/xmpp-pubsub.html.