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In wireless sensor networks the nodes periodically sense the environment, and huge amount of raw data are injected into the network. In order to extract useful information from the network, yet at the same time to incur least energy consumption, complex event processing techniques are highly required. In this paper we propose a framework for complex event processing in wireless sensor networks. Our framework is based on the layered network, and transforms the complex events into sub-events that are suitable to be detected by nodes within regional areas. As a middleware, our framework is easy to extend, and various complex event processing algorithms could be embedded into the framework.