no code implementations • 17 Jul 2023 • Tim S. Lyon, Sebastian Rudolph
This paper establishes alternative characterizations of very expressive classes of existential rule sets with decidable query entailment.
1 code implementation • 27 Apr 2023 • Lucía Gómez Álvarez, Sebastian Rudolph, Hannes Strass
Standpoint EL is a multi-modal extension of the popular description logic EL that allows for the integrated representation of domain knowledge relative to diverse standpoints or perspectives.
no code implementations • 13 Apr 2023 • Thomas Feller, Tim S. Lyon, Piotr Ostropolski-Nalewaja, Sebastian Rudolph
We propose a generic framework for establishing the decidability of a wide range of logical entailment problems (briefly called querying), based on the existence of countermodels that are structurally simple, gauged by certain types of width measures (with treewidth and cliquewidth as popular examples).
no code implementations • 25 Feb 2023 • Lucía Gómez Álvarez, Sebastian Rudolph, Hannes Strass
The tractability of the lightweight description logic EL has allowed for the construction of large and widely used ontologies that support semantic interoperability.
no code implementations • 6 Sep 2022 • Thomas Feller, Tim S. Lyon, Piotr Ostropolski-Nalewaja, Sebastian Rudolph
The FCS class properly generalizes the class of finite-expansion sets (FES), and for signatures of arity at most 2, the class of bounded-treewidth sets (BTS).
no code implementations • 14 Jun 2022 • Lucía Gómez Álvarez, Sebastian Rudolph, Hannes Strass
By virtue of this result, existing highly optimised OWL reasoners can be used to provide practical reasoning support for ontology languages extended by standpoint modelling.
no code implementations • 27 Dec 2021 • Faiq Miftakhul Falakh, Sebastian Rudolph, Kai Sauerwald
As our second core contribution, we provide a characterization of all logics for which our result can be strengthened to assignments producing transitive preference relations (as in K&M's original work).
no code implementations • 29 Jun 2021 • Bartosz Bednarczyk, Sebastian Rudolph
In logic-based knowledge representation, query answering has essentially replaced mere satisfiability checking as the inferencing problem of primary interest.
no code implementations • 29 Apr 2021 • Faiq Miftakhul Falakh, Sebastian Rudolph, Kai Sauerwald
The AGM postulates by Alchourr\'{o}n, G\"{a}rdenfors, and Makinson continue to represent a cornerstone in research related to belief change.
no code implementations • 21 Jan 2021 • Emanuel Kieroński, Sebastian Rudolph
The Triguarded Fragment (TGF) is among the most expressive decidable fragments of first-order logic, subsuming both its two-variable and guarded fragments without equality.
no code implementations • 22 Dec 2020 • Nacira Abbas, Kholoud Alghamdi, Mortaza Alinam, Francesca Alloatti, Glenda Amaral, Claudia d'Amato, Luigi Asprino, Martin Beno, Felix Bensmann, Russa Biswas, Ling Cai, Riley Capshaw, Valentina Anita Carriero, Irene Celino, Amine Dadoun, Stefano De Giorgis, Harm Delva, John Domingue, Michel Dumontier, Vincent Emonet, Marieke van Erp, Paola Espinoza Arias, Omaima Fallatah, Sebastián Ferrada, Marc Gallofré Ocaña, Michalis Georgiou, Genet Asefa Gesese, Frances Gillis-Webber, Francesca Giovannetti, Marìa Granados Buey, Ismail Harrando, Ivan Heibi, Vitor Horta, Laurine Huber, Federico Igne, Mohamad Yaser Jaradeh, Neha Keshan, Aneta Koleva, Bilal Koteich, Kabul Kurniawan, Mengya Liu, Chuangtao Ma, Lientje Maas, Martin Mansfield, Fabio Mariani, Eleonora Marzi, Sepideh Mesbah, Maheshkumar Mistry, Alba Catalina Morales Tirado, Anna Nguyen, Viet Bach Nguyen, Allard Oelen, Valentina Pasqual, Heiko Paulheim, Axel Polleres, Margherita Porena, Jan Portisch, Valentina Presutti, Kader Pustu-Iren, Ariam Rivas Mendez, Soheil Roshankish, Sebastian Rudolph, Harald Sack, Ahmad Sakor, Jaime Salas, Thomas Schleider, Meilin Shi, Gianmarco Spinaci, Chang Sun, Tabea Tietz, Molka Tounsi Dhouib, Alessandro Umbrico, Wouter van den Berg, Weiqin Xu
Although linked open data (LOD) is one knowledge graph, it is the closest realisation (and probably the only one) to a public FAIR Knowledge Graph (KG) of everything.
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 • 14 Feb 2020 • Franz Baader, Bartosz Bednarczyk, Sebastian Rudolph
On the other hand, the satisfiability problem becomes undecidable if inverse roles are added to the languages.
2 code implementations • 21 Jun 2019 • Xiaoyu Yin, Dagmar Gromann, Sebastian Rudolph
SPARQL is a highly powerful query language for an ever-growing number of Linked Data resources and Knowledge Graphs.
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.
no code implementations • WS 2017 • Shima Asaadi, Sebastian Rudolph
Learning word representations to capture the semantics and compositionality of language has received much research interest in natural language processing.
no code implementations • 3 Nov 2015 • Sarah Alice Gaggl, Sebastian Rudolph, Lukas Schweizer
To exploit the Web Ontology Language OWL as an answer set programming (ASP) language, we introduce the notion of bounded model semantics, as an intuitive and computationally advantageous alternative to its classical semantics.
no code implementations • 15 Dec 2014 • Sebastian Rudolph, Michaël Thomazo, Jean-François Baget, Marie-Laure Mugnier
We provide a generic algorithm for query entailment under gbts, which is worst-case optimal for combined complexity with or without bounded predicate arity, as well as for data complexity and query complexity.
no code implementations • 16 Jan 2014 • Sebastian Rudolph, Birte Glimm
Provided that queries contain only simple roles, our result also shows decidability of entailment of (unions of) conjunctive queries in the logic that underpins OWL 1 DL and we believe that the presented results will pave the way for further progress towards conjunctive query entailment decision procedures for the Description Logics underlying the OWL standards.
no code implementations • 12 Dec 2012 • Michael Schneider, Sebastian Rudolph, Geoff Sutcliffe
We then report on the results of evaluating several state-of-the-art OWL 2 DL reasoners on problems that use combinations of features in a way that the global restrictions are violated.