Publish/Subscribe for RDF-based P2P Networks

Publish/subscribe systems are an alternative to query based systemsin cases where the same information is asked for over and over, and where clientswant to get updated answers for the same query over a period of time. Recentpublish/subscribe systems such as P2P-DIET have introduced this paradigm inthe P2P context. In this paper we built on the experience gained with P2P-DIETand the Edutella P2P infrastructure and present the first implementation of a P2Ppublish/subscribe system supporting metadata and a query language based onRDF. We define formally the basic concepts of our system and present detailedprotocols for its operation. Our work utilizes the latest ideas in query processingfor RDF data, P2P indexing and routing research.