Query Rewriting and Optimisation with Database Dependencies in Ontop.
Mariano Rodríguez-Muro, Roman Kontchakov, Michael Zakharyaschev · 2013
Abstract. We present technologies that underpin the OBDA system Ontop and take full advantage of storing data in relational databases. We discuss the theoretical foundations of Ontop, including the tree-witness query rewriting, T-mappings and optimisations based on database integrity constraints and SQL features. 1