Oil IT Journal Interviews Geir Engdahl, CTO and co-founder of Cognite. Cognite Data Fusion is built atop a PostgreSQL database. A new API, a.k.a the PG3, a ‘Pretty Good Property Graph for PostgreSQL’ allows for ad-hoc model extensions. Cognite likes standards, graphs and open source software. Has Oil IT Journal’s long time skepticism regarding the Semantic Web been misplaced?