no code implementations • 7 Jun 2022 • David Carral, Lucas Larroque, Marie-Laure Mugnier, Michaël Thomazo
Existential rules are an expressive knowledge representation language mainly developed to query data.
no code implementations • 4 Feb 2021 • Efthymia Tsamoura, David Carral, Enrico Malizia, Jacopo Urbani
The chase is a well-established family of algorithms used to materialize Knowledge Bases (KBs), like Knowledge Graphs (KGs), to tackle important tasks like query answering under dependencies or data cleaning.
no code implementations • 21 Dec 2020 • Piotr Ostropolski-Nalewaja, Jerzy Marcinkowski, David Carral, Sebastian Rudolph
This paper is about (first order) query rewritability in the context of theory-mediated query answering.
Databases
no code implementations • 25 Nov 2019 • David Carral, Jacopo Urbani
Therefore, one can apply existing acyclicity notions to check chase termination over an axiomatisation of an ontology and then use the original ontology for reasoning.
no code implementations • 30 Aug 2018 • Md. Kamruzzaman Sarker, David Carral, Adila A. Krisnadhi, Pascal Hitzler
In our experience, some ontology users find it much easier to convey logical statements using rules rather than OWL (or description logic) axioms.
no code implementations • 30 Aug 2018 • Md. Kamruzzaman Sarker, Adila Krisnadhi, David Carral, Pascal Hitzler
It has been argued that it is much easier to convey logical statements using rules rather than OWL (or description logic (DL)) axioms.
no code implementations • 19 Apr 2018 • David Carral, Cristina Feier, Pascal Hitzler
Conjunctive query answering over expressive Horn Description Logic ontologies is a relevant and challenging problem which, in some cases, can be addressed by application of the chase algorithm.
no code implementations • 13 Oct 2017 • David Carral, Pascal Hitzler, Hilmar Lapp, Sebastian Rudolph
Trees -- i. e., the type of data structure known under this name -- are central to many aspects of knowledge organization.