Storing RDF as a graph

RDF is the first W3C standard for enriching information resources of the Web with detailed meta data. The seman-tics of RDF data is defined using a RDF schema. The most expressive language for querying RDF is RQL, which en-ables querying of semantics. In order to support RQL, a RDF storage system has to map the RDF graph model onto its storage structure. Several storage systems for RDF data have been developed, which store the RDF data as triples in a relational database. To evaluate an RQL query on those triple structures, the graph model has to be rebuilt from the triples. In this paper, we presented a new approach to store RDF data as a graph in a object-oriented database. Our ap-proach avoids the costly rebuilding of the graph and effi-ciently queries the storage structure directly. The advan-tages of our approach have been shown by performance test on our prototype implementation OO-Store. 1