“SPARQL 1.1 is a set of specifications that provide languages and protocols to query and manipulate RDF graph content on the Web or in an RDF store” (The W3C SPARQL Working Group, 2013). SPARQL can be used to express queries across diverse data sources.
Reference
The W3C SPARQL Working Group. 2013. “SPARQL 1.1 Overview.” https://www.w3.org/TR/sparql11-overview/.