In Controlled Query Evaluation (CQE) confidential data are protected through a declarative policy and a (optimal) censor, which guarantees that answers to queries are maximized without disclosing secrets. In this paper we consider CQE over Description Logic ontologies and study query answering over all optimal censors. We establish data complexity of the problem for ontologies specified in DL-LiteR and for variants of the censor language, which is the language used by the censor to enforce the policy. In our investigation we also analyze the relationship between CQE and the problem of Consistent Query Answering.
2019, SEBD 2019 Italian Symposium on Advanced Database Systems, Pages - (volume: 2400)
A novel approach to controlled query evaluation in DL-Lite (04b Atto di convegno in volume)
Lembo D., Rosati R., Savo D. F.
Gruppo di ricerca: Data Management and Semantic Technologies