55 citations · 114 across the 15 of their papers we have counts for
3 papers · 1 filter
High-Level Why-Not Explanations using Ontologies
Balder ten Cate, Cristina Civili, Evgeny Sherkhonov +1
We propose a novel foundational framework for why-not explanations, that is, explanations for why a tuple is missing from a query result. Our why-not explanations leverage concepts…
Ontology-based Data Access: A Study through Disjunctive Datalog, CSP, and MMSNP
Meghyn Bienvenu, Balder ten Cate, Carsten Lutz +1
Ontology-based data access is concerned with querying incomplete data sources in the presence of domain-specific knowledge provided by an ontology. A central notion in this setting…
Queries with Guarded Negation (full version)
Vince Barany, Balder ten Cate, Martin Otto
A well-established and fundamental insight in database theory is that negation (also known as complementation) tends to make queries difficult to process and difficult to reason ab…