Hi, On 08/01/17 23:25, Ling wrote:
Hi, very happy to join the Jena community. To start with, I have a few basic questions: 1) Is Jena still active in development, and with a good user community?
Yes.
2) Anyone know of any commercial use of it?
Yes, lots. If you look back through the mail list you'll see various threads on this type question with a good range of examples of commercial use, there was one such thread late last year if I recall correctly.
3) For millions of entities and relationships, will there an efficiency problem?
We (and others) run multiple production services with hundreds of millions of triples. Efficiency is sufficient for our purposes.
Of course the specifics matter!
4) Can Jena handle OWL ontology which are created by Protege?
Jena can read and access OWL ontologies. It provides a convenience API for accessing OWL 1 ontologies. There is no equivalent for OWL 2 though since OWL is encoded on top of RDF it is still possible to access OWL 2 ontologies through Jena, just takes more work.
Inference support for fragments of OWL 1 is provided out of the box and there are third party reasoners such as Protege. However, OWL inference at scale over large persistent models is not particularly well supported.
Dave
