Java toolkit for manipulating RDF models from HP Labs Bristol
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ARP - RDF/XML Parser
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Persistence - MySQL, Oracle and Postgres
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Ontology Subsystem - API for managing RDF, RDFS, OWL
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Reasoning Subsystem - Inference capabilities for RDFS and
OWL
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RDQL query language
Jena is powerful, flexible and easy Java based toolkit for
developing applications within the Semantic Web.