Have 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.
Handling RDF data with Apache Jena
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Handling RDF data with Apache Jena
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