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The Publish-Subscribe paradigm has been in the spotlight of recent research efforts. Its information oriented nature, the decoupling it offers between information providers and information consumers as well as its location-identity split properties, have inspired a variety of - mainly overlay - architectures that focus on multicast, mobility, indirection as well as on caching. Publish-Subscribe architectures are composed of three main components; publishers, subscribers and a network of brokers. Publishers are information providers that 'Publish' information (advertisements).
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