Design and performance evaluation of cloud-based XML publish/subscribe services

XML message filtering and routing have been recognized as a standard for data exchange for XML dissemination services. These services are often realized using the Publish/Subscribe (pub/sub) model. The Pub/sub model is commonly used by various web-based systems, such as Web content syndication, RSS feeds, location-based services. Conventional XML filtering and forwarding is an application-layer multicast approach that relies on XML-capable brokers. Those XML-capable brokers are built above the network layer using an overlay model for message dissemination. Such an overlay model introduces a great deal of overhead in terms of initial deployment and subsequent operational cost for those XML-capable brokers that typicall