I noticed in Seth Ladd’s Semergence blog that the next version of Oracle’s RDF Database (11g) is expected to have native inferencing for a subset of OWL. This is in addition to faster querying and bulk-loading and “new SQL operators for enhancing a relational query using an ontology”. See this thread in Oracle’s Semantic Technologies Forum.

According to a recent presentation on 10g, the native OWL inferencing will include:

• Basics: class, subclass, property, subproperty, domain,
  range, type
• Property Characteristics: transitive, symmetric, functional, inverse functional, inverse
• Class comparisons: equivalence, disjointness
• Property comparisons: equivalence
• Individual comparisons: same, different
• Class expressions: complement

We’ve not yet tried 10g, but it’s on our short list of things to do. I guess this task just moved up in the list.

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