RDF updates with constraints

Abstract

This paper deals with the problem of updating an RDF database, expected to satisfy user-defined constraints as well as RDF intrinsic semantic constraints. As updates may violate these constraints, side-effects are generated in order to preserve consistency. We investigate the use of nulls (blank nodes) as placeholders for unknown required data as a technique to provide this consistency and to reduce the number of side-effects. Experimental results validate our goals.