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In this paper, we focus on RFID middleware's event management functionality that provides a means of specifying event-constraints for filtering a huge number of raw data cought from the associated RF readers. However, the current specifications are too circumstantial to be understood by the application developers who used to lack the professional and technological backgrounds of the RFID middleware functionality. As an impeccable solution, we propose the concept of event-constraint policy that is not only representing semantic contents of RFID domains but also providing transparencies with higher level abstractions for RFID applications. We also embody the proposed concept in an XML-based RFID event policy definition language, which is abbreviated to rXPDL. Finally, we expect that the application developers are able to easily specify their RFID applications' event-constraints through the proposed concept, and that the concept is also able to be extensively applied to other ad hoc sensor networks.