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The primary goal of RFID middleware as a tool of item management is to provide a series of filtered tag data to the RFID-based applications. The middleware also provides a means of specifying event-constraints in order to filter a huge number of raw data cought from the associated RF readers. In terms of specifying the RFID event-constraints for the applications' events refinement, the current specifications are too circumstantial to be understood by application developers who are lacking in professional and technological backgrounds on RFID middleware. The application developers have got to be acquired the RFID's event services such as ALE, ONS and EPCIS as well as other detailed RFID-relevant technologies. To alleviate these difficulties, this paper proposes a RFID event management framework supporting an XML-based RFID event management policy definition language and its exchanging protocol. Through the proposed framework, it is expected for the developers to be able to easily specify their event-constraints by furnishing with a high-level abstraction.