Starting with version 4.5, Virtuoso provides built-in support for SPARQL, the standard query language for RDF and the semantic web. Adoption of SPARQL with Virtuoso is effortless, as any existing SQL client applications and stored procedures can take advantage of SPARQL simply by using it in the place of or inside SQL queries. Additionally, Virtuoso offers the standard SPARQL protocol to HTTP clients.
This chapter discusses Virtuoso's RDF triple storage and query capabilities. This is divided into a discussion of the RDF data representation, the SPARQL and SQL API's, protocol support and standard compliance notes.
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