Search Results for author: David Carral

Found 8 papers, 0 papers with code

Normalisations of Existential Rules: Not so Innocuous!

no code implementations7 Jun 2022 David Carral, Lucas Larroque, Marie-Laure Mugnier, Michaël Thomazo

Existential rules are an expressive knowledge representation language mainly developed to query data.

Materializing Knowledge Bases via Trigger Graphs

no code implementations4 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.

Knowledge Graphs

A Journey to the Frontiers of Query Rewritability

no code implementations21 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

Checking Chase Termination over Ontologies of Existential Rules with Equality

no code implementations25 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.

Modeling OWL with Rules: The ROWL Protege Plugin

no code implementations30 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.

Rule-based OWL Modeling with ROWLTab Protege Plugin

no code implementations30 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.

A Practical Acyclicity Notion for Query Answering over Horn-SRIQ Ontologies

no code implementations19 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.

On the Ontological Modeling of Trees

no code implementations13 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.

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