149019 20250124153131.0 doi 10.1108/EL-02-2023-0052 sideral 136315 ART-2023-136315 eng Yagüe, José Félix FUKG: answering flexible queries over knowledge graphs 2023 Purpose: There is an increasing interest in the use of knowledge graphs to represent real-world knowledge and a common need to manage imprecise knowledge in many real-world applications. This paper aims to study approaches to solve flexible queries over knowledge graphs. Design/methodology/approach: By introducing fuzzy logic in the query answering process, the authors are able to obtain a novel algorithm to solve flexible queries over knowledge graphs. This approach is implemented in the FUzzy Knowledge Graphs system, a software tool with an intuitive user-graphical interface. Findings: This approach makes it possible to reuse semantic web standards (RDF, SPARQL and OWL 2) and builds a fuzzy layer on top of them. The application to a use case shows that the system can aggregate information in different ways by selecting different fusion operators and adapting to different user needs. Originality/value: This approach is more general than similar previous works in the literature and provides a specific way to represent the flexible restrictions (using fuzzy OWL 2 datatypes). Access copy available to the general public Unrestricted info:eu-repo/grantAgreement/ES/AEI/PID2020-113903RB-I00 info:eu-repo/semantics/openAccess by-nc http://creativecommons.org/licenses/by-nc/3.0/es/ 1.5 2023 INFORMATION SCIENCE & LIBRARY SCIENCE 70 / 161 = 0.435 2023 Q2 T2 0.447 2023 Library and Information Sciences 2023 Q2 Computer Science Applications 2023 Q3 4.2 2023 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Huitzil, Ignacio Universidad de Zaragoza (orcid)0000-0002-7581-0345 Bobed, Carlos Universidad de Zaragoza (orcid)0000-0003-4239-8785 Bobillo, Fernando Universidad de Zaragoza (orcid)0000-0001-5136-4152 5007 570 Universidad de Zaragoza Dpto. Informát.Ingenie.Sistms. Área Lenguajes y Sistemas Inf. 42, 3 (2023), 368-392 Electron. libr. Electronic library 0264-0473 932280 http://zaguan.unizar.es/record/149019/files/texto_completo.pdf Postprint 1676297 http://zaguan.unizar.es/record/149019/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:149019 articulos driver 2025-01-24-14:49:07 ARTICLE