... into two planes of processing - the data plane and the query plane. The data plane captures the flow of mes-sages in the system while the query plane captures the flow of queries and query-related ... Altinel, M., Zhang, H., Franklin, M.J., and Fischer, P.M. Path Sharing and Predicate Evaluation for High-Performance XML Filtering. TODS, 28(4), 467-516, Dec. 2003. [17] Diao, Y., and Franklin, ... plane, is underway. We expect to fully implement the data and query planes using YFilter over the course of the sum-mer, and deploy our system on PlanetLab [31] in the fall. We also plan...