GraphDB-SE is the commercial edition of GraphDB – a high-performance semantic repository created by Ontotext. It is implemented in Java and packaged as a Storage and Inference Layer (SAIL) for the Sesame RDF framework. GraphDB-SE is a native RDF rule-entailment and storage engine. The supported semantics can be configured through rule-set definition and selection. Included are rule-sets for OWL-Horst , unconstrained RDFS  with OWL Lite  and the OWL2 profiles RL and QL . Custom rule-sets allow tuning for optimal performance and expressivity.
The key features of the current release of GraphDB-SE can be summarised as follows:
is a Java library without user interface. Sesame's Web UI applications can be used.
GraphDB-SE is available under an RDBMS-like commercial license on a per-server-CPU basis; it is neither free nor open-source. To purchase a license or obtain a copy for evaluation, please, contact GraphDBemail@example.com.
GraphDB-SE is distributed as a ZIP archive that contains GraphDB-SE's compiled jar's, all required libraries, configuration files, documentation, sample code and data. GraphDB-SE is designed to be used as a Storage and Inference Layer (SAIL) for the Sesame openRDF framework – no GraphDB specific interfaces are intended for external use. A repackaged Sesame 2 SDK is included as part of the GraphDB distribution. Use of the rule-compiler (i.e. custom rule-sets) requires the Java Development Kit (JDK) version 1.6 or later, otherwise a Java Runtime Environment (JRE) version 1.6 or later is required.
GraphDB uses Sesame as a library, taking advantage of its APIs for storage and querying, as well as the support for a wide variety of query languages (e.g. SPARQL and SeRQL) and RDF syntaxes (e.g. RDF/XML, N3, Turtle).
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