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Join For FreeHave you heard of Apache Jena? It's a Java framework for building Semantic Web applications that's been in the Apache incubation stage since November of 2010, and provides developers with a library to handle RDF, RDFS, RDFa, OWL and SPARQL in line with the relevant W3C recommendations.
Paolo Castagna, a software engineer at Talis Systems Ltd. and a committer for the Jena project, gave a talk at ApacheCon NA 2011 on how Jena utilizes RDF data and queries it with SPARQL. If your knowledge of these latter topics is a little rusty, don't fret: Paolo's talk includes an introduction to the fundamentals of the RDF data model as well as the SPARQL query language.
Get the .mp3 file for Paolo's talk here.
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