Semantic Query Routing and Processing in P2P Database Systems: The ICS-FORTH SQPeer Middleware
نویسندگان
چکیده
Peer-to-peer (P2P) computing is currently attracting enormous attention. In P2P systems a very large number of autonomous computing nodes (the peers) pool together their resources and rely on each other for data and services. More and more P2P data management systems employ nowadays intensional (i.e., schema) information for integrating and querying peer bases in, so-called, Semantic Overlay Networks (SONs). Such information can be easily captured by emerging Semantic Web languages such as RDF/S. However, a fully-fledged framework for evaluating semantic queries over peer RDF/S bases (materialized or virtual) is missing. In this paper, we present the ICS-FORTH SQPeer middleware for routing and processing RQL queries and RVL views taking into account the data distribution (e.g., vertical, horizontal) involved in peer bases. To the best of our knowledge, SQPeer is the first middleware exploiting the full-power of RDF/S-based SONs for both hybrid and adhoc P2P database systems.
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