The cost model for fragmented XML streams

The cost-model for XML stream is the theory foundation in the research of XML stream dissemination, fragmentation and evaluation. According to the matching operations in fragmented XML stream system, this paper analyzes the features of the system overhead on client, network and server, and brings in the cost model for fragmented XML stream based on Hole-Filler model. Based on the cost model, this paper illustrates the influence of the fragmentation policy on XML dissemination system by an application and proposes a series of selection policies for XML stream fragmentation to improve the system efficiency, adaptivity and scalability.