A SPARQL 1.1 server for RDF graphs, exposing HTTP APIs for query, update, and dataset management (TDB2, etc.). In production it is valued for maturity, containerization, and predictable behavior under load. OWL2 reasoning can be added via Jena’s built‑in inference/rule engines or by integrating external OWL2 DL reasoners. For enterprise data quality, SHACL validation is available (Jena SHACL); SPIN-style constraints can be implemented as SPARQL rules/CONSTRUCT.