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The Virtuoso #GQL + RDF Extension implements the ISO/IEC 39075:2024 Graph Query Language as a translation layer atop Virtuoso’s SPARQL engine, allowing property-graph queries over RDF data held in its quad store and thereby connecting the ISO #GQL standard with the W3C RDF/SPARQL ecosystem.#GQL queries are converted to SPARQL for execution by Virtuoso’s optimized engine (including its cost-based optimizer, transitive paths and geospatial indexing), while INSERT, DELETE, SET, REMOVE and MODIFY operations map to SPARQL Update for atomic changes; Virtuoso-specific features such as inference, owl:sameAs, geospatial functions and RDF 1.2 triple terms remain accessible through VERSION, DEFINE and OPTION clauses.

https://www.openlinksw.com/virtuoso/docs/gql/#gql-overview