Jena is a Java framework for building Semantic Web applications. It provides a programmatic environment for RDF, RDFS and OWL, SPARQL and includes a rule-based inference engine.
R. Hoekstra, J. Breuker, M. Bello, and A. Boer. Proceedings of the Workshop on Legal Ontologies and Artificial Intelligence Techniques (LOAIT 2007), (June 2007)
Y. Raimond, S. Abdallah, M. Sandler, and F. Giasson. Proceedings of the 8th International Conference on Music Information Retrieval (ISMIR 2007), page 417--422. Vienna, Austria, (September 2007)