Seth Ladd blogs about Oracle 10g, which has support for RDF. He found a lot to like, including the ability to define rules (e.g., for RDFS or OWL), and one show stopper — any modifications to the RDF model (e.g., adding a triple) require rebuilding your rule indexes. Oracle has some documents and papers online on its RDF support, including:

• RDF 10g release
• Supporting Ontology-based Semantic Matching in RDBMS, Souripriya Das, Eugene Inseok Chong, George Eadon, Jagannathan Srinivasan
• RDF Support in Oracle RDBMS, S. Das (presentation)

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