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There are changes both internal (several performance improvements, and some functionality additions to existing APIs), and external. The features in 11g can be summarized as follows (they are also included in the Oracle World presentation available at: http://www.oracle.com/technology/tech/semantic_technologies/index.html (second link under 'what's new')
(1) Fast bulk-load (several times faster than the 10gR2 batch load) [New API]
(2) Native OWL inferencing (for an OWL subset that includes property characteristics, class comparisons, proprety comparisons, individual comparions and class expressions) [New API]
(3) Faster query [these changes are internal only]
(4) New SQL operators for enhancing a relational query using an ontology
(The above is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions.The development, release, and timing of any features or functionality described for Oracle’s products remain at the sole discretion of Oracle.)
Oracle Database Semantic Technologies Group
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Wanted to start this thread to extend this a little further. It is very nice to see OWL support, bulk load api and other options in 11g that were not supported in 10g.
I am just curious to see what else is going be added to 11g from semantic web perspective? It will be good, may be if you can give some idea what we can expect in the next 6 months to 1 year.
[For example I like the way application express team gives the information about their statement of direction http://www.oracle.com/technology/products/database/application_express/apex_sod.html ]