document: Jena : implementing the semantic web recommendations The new Semantic Web recommendations for RDF , RDFS and OWL have , at their heart , the RDF graph . Jena2 , a second-generation RDF toolkit , is similarly centered on the RDF graph . RDFS and OWL reasoning are seen as graph-to-graph transforms , producing graphs of virtual triples . Rich APIs are provided . The Model API includes support for other aspects of the RDF recommendations , such as containers and reification . The Ontology API includes support for RDFS and OWL , including advanced OWL Full support . Jena includes the de facto reference RDF\/XML parser , and provides RDF\/XML output using the full range of the rich RDF\/XML grammar . N3 I\/O is supported . RDF graphs can be stored in-memory or in databases . Jena 's query language , RDQL , and the Web API are both offered for the next round of standardization .
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