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Context-aware applications generally need to retrieve various kinds of dynamic context data from a large number of context sources. A middleware managing context sources must provide an efficient context lookup mechanism to ease application development. In this paper, the authors categorize the context sources as operating spaces and propose semantic peer-to-peer overlays over these spaces to accelerate dynamic context lookup in a context-aware middleware. Their proposed overlay structure is specially designed to deal with dynamic sensory context such as a person's location and temperature that are frequently changing and difficult to be promptly retrieved using traditional peer-to-peer protocols.
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