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The authors demonstrate ProSem, a scalable wide-area publish/subscribe system that supports complex, stateful subscriptions as well as simple ones. One unique feature of ProSem is its cost-based joint optimization of both subscription processing and notification dissemination. ProSem uses novel reformulation techniques to expose new alternatives for processing and disseminating data using standard stateless content-driven network components. The ubiquity of the Internet has generated unprecedented demand for information. A publish/subscribe system is well-suited to the task of matching data recipients (subscribers) to data providers (publishers).
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