Relational to RDF Data Exchange in Presence of a Shape Expression Schema

Iovka Boneva (1, 2) , Jose Martin Lozano Aparicio (1, 2) , Sławek Staworko (1, 2)

1 CRIStAL - Centre de Recherche en Informatique, Signal et Automatique de Lille - UMR 9189
2 LINKS - Linking Dynamic Data

We study the relational to RDF data exchange problem, where the target constraints are specified using Shape Expression schema (ShEx). We investigate two fundamental problems: 1) consistency which is checking for a given data exchange setting whether there always exists a solution for any source instance, and 2) constructing a universal solution which is a solution that represents the space of all solutions. We propose to use typed IRI constructors in source-to-target tuple generating dependencies to create the IRIs of the RDF graph from the values in the relational instance, and we translate ShEx into a set of target dependencies. We also identify data exchange settings that are key covered, a property that is decidable and guarantees consistency. Furthermore, we show that this property is a sufficient and necessary condition for the existence of universal solutions for a practical subclass of weakly-recursive ShEx.

Domaines: Base de données [cs.DB]; Web

Iovka Boneva, Jose Martin Lozano Aparicio, Sławek Staworko. Relational to RDF Data Exchange in Presence of a Shape Expression Schema. AMW 2018 - 12th Alberto Mendelzon International Workshop on Foundations of Data Management, May 2018, Cali, Colombia. pp.1-16. ⟨hal-01775199⟩