That "little known database software" is called an RDF triplestore. You can think of it as a graph store on steroids, which allows you to formulate very complex

That "little known database software" is called an RDF triplestore. You can think of it as a graph store on steroids, which allows you to formulate very complex queries on linked data (which wikipedia has plenty of). Take a look at https://www.futurelearn.com/courses/linked-data https://www.futurelearn.com/courses/linked-data for learning more (not affiliated with the authors, just enjoyed the course).