Abstract Information systems have to deal with an increasing amount of data that is
heterogeneous, unstructured, or incomplete. In order to align and complete data, systems …

Entrustable professional activities (EPAs) have received much attention in the literature
since they were first proposed in 2005. Useful guidelines, workshops, courses, and …

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 …

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 about …

The importance of taking individual, potentially conflicting perspectives into account when
dealing with knowledge has been widely recognised. Many existing ontology management …

We perform an in-depth complexity analysis of query answering under guarded-based
classes of disjunctive tuple-generating dependencies (DTGDs), focusing on (unions of) …

In logics with the Craig interpolation property (CIP) the existence of an interpolant for an
implication follows from the validity of the implication. In logics with the projective Beth …

While the problem of answering positive existential queries, in particular, conjunctive
queries (CQs) and unions of CQs, over description logic ontologies has been studied …

Abstract The Guarded Negation Fragment (GNFO) is a fragment of first-order logic that
contains all unions of conjunctive queries, a restricted form of negation that suffices for …

View update is an important mechanism that allows updates on a view by translating them
into the corresponding updates on the base relations. The existing literature has shown the …