YARS is a data store for RDF in Java and allows for querying RDF based on a declarative query language, which offers a somewhat higher abstraction layer than the APIs of RDF toolkits such as Jena or Redland.
DERI researchers have developed a new high-speed RDF search engine capable of answering search queries with more than seven billion RDF statements in mere fractions of a second.
K. Tolle. AISTA'04: International Conference on Advances in Intelligent Systems
- Theory and Applications in cooperation with IEEE Computer Society,
Centre de Recherche Public Henri Tudor, Luxembourg, (November 2004)