GraphDB-Lite Fact Sheet

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Version 3 by Reneta Popova
on Aug 21, 2014 17:58.

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GraphDB-Lite is a high-performance semantic repository created by Ontotext including a native RDF rule entailment engine. It is implemented in Java and packaged as a Storage and Inference Layer (SAIL) for the Sesame openRDF framework. The supported semantics can be configured through rule-set definition and selection. Rule-sets for OWL-Horst, unconstrained RDFS with OWL- Lite and the OWL2 RL profile are included. Custom rule-sets allow tuning for optimal performance and expressivity.
Reasoning and query evaluation are performed in-memory. A reliable persistence strategy ensures data preservation, consistency, and integrity. GraphDB-Lite can manage millions of explicit statements on desktop hardware. A principle limitation of GraphDB-Lite is the relatively slow delete operation, whereas loading, reasoning, and query evaluation proceed extremely quickly even against huge ontologies and knowledge bases. According to the limited evaluation data available, GraphDB-Lite is the fastest OWL repository available.
GraphDB's web site, [http://www.ontotext.com/owlim|http://www.ontotext.com/owlim]{color:#0000ff},{color} [http://www.ontotext.com/products/ontotext-graphdb/|http://www.ontotext.com/products/ontotext-graphdb/] provides extensive information and references regarding support contacts and mailing lists, documentation, download details and latest performance benchmarks.

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The key features of the current release of GraphDB-Lite can be summarised as follows:
* *The fastest* *semantic repository* in the Wworld, it can perform non-trivial inference on millions of RDF data statements;
* *Pure Java implementation*, ensuring ease of deployment and portability;
* Compatible with *Sesame 2*, which brings interoperability benefits and support for all major RDF syntaxes and query languages;
+GraphDB-Lite+ is a Java library without user interface. Sesame's Web UI applications can be used.
+Interfaces (API, Web Services)+: GraphDB implements the SAIL interfaces of Sesame, so it can be used locally (embedded) or remotely via the Sesame HTTP server.
+Platform:+ Java JRE version 1.6 or later (both 32-bit and 64-bit versions). If using custom rule-sets are used rule-sets, then a Java JDK version 1.6 or later is required.
+Supported standards:+ GraphDB is bound to the data and query standards supported by Sesame. RDF is the basic data standard; the supported query languages are: SeRQL, SPARQL, RQL, RDQL.
+Syntaxes:+ The import and export of all major RDF syntaxes (XML, N3, N-Triples, N-Quads, Turtle, TriG, TriX) is supported through Sesame.
h1. Licensing

GraphDB-Lite -- (c) Copyright Ontotext AD. GraphDB-Lite is _not open-source software_. GraphDB-Lite is licensed for use free of charge. Re-distribution of GraphDB-Lite in any form other than the original distribution package is strictly forbidden. Any form of modification or reverse-engineering of GraphDB-Lite is forbidden. GraphDB-Lite is distributed without any warranty. Full licensing information is available in the licencse file in the 'doc' folder of the distribution package.
Sesame - (c) Copyright Aduna b.v. Sesame is an open-source library, available under [LGPL|http://www.gnu.org/copyleft/lesser.html].

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 1.1 and SeRQL) and RDF syntaxes (e.g. RDF/XML, N3, Turtle).

The development of GraphDB is partly supported by [SEKT|http://www.sekt-project.com/], [TAO|http://www.tao-project.eu], [TripCom|http://www.tripcom.org/], [LarKC|http://www.larkc.eu/], and other [FP6|http://cordis.europa.eu/fp6/] and [FP7|http://cordis.europa.eu/fp7/] European research [projects|http://www.ontotext.com/research/]. [projects|http://www.ontotext.com/resources/].