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Comment by iand | Hacker News Reader

Apache Jena is a graph database and has been an Apache project since 2011 and graduated from the incubator in Apr 2012

http://jena.apache.org/

One tangential direction we want to go with Titan is benchmarking it as a distributed RDF store. With edge indexing now in Titan 0.3.0 and Blueprints Sail (GraphSail), Titan can represent an RDF graph and be queried using SPARQL.

   https://github.com/tinkerpop/blueprints/wiki/Sail-Ouplementation

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