The W3C Semantic Web Group recently standardized its recommendation for the SPARQL Query Language for RDF. RDF is a directed, labeled graph data format for representing information in the Web.
SPARQL (pronounced Sparkle) is a query language for RDF that can be used against diverse data sources, whether the data is stored natively as RDF or viewed as RDF via middleware. SPARQL in many ways opens the door to the true Semantic Web and once fully adopted as the main RDF query language, will accelerate creation of advanced automated data sharing applications.
Ivan Herman recently presented a tutorial entitled “Introduction to the Semantic Web” that gives a great overview of how the Semantic Web works.