@inproceedings{0f6d032bd2504e6b8aead7c97b36f777,
title = "RDF Query Answering in the Presence of Access Restrictions",
abstract = "In this work, we explore algorithms for answering conjunctive RDF queries in the presence of RDFS ontologies and access control. We consider an access control setting where by default all users have access to the complete graph, and a restriction can forbid user a user{\textquoteright}s access to specific IRIs. Here, restricting for user u the access to an IRI i entails that: no answer to a query by u may contain the IRI i; no triple containing i can be used to compute an answer for a query by i, nor to entail such a triple via reasoning with the ontology. We present a set of query answering algorithms for this novel context, and prove that five among them are correct, i.e., sound and complete, with respect to both the ontology and the access restrictions in place. We have implemented all our algorithms and present experiments comparing their performance.",
keywords = "Access Control, Query Answering, Semantic Web",
author = "Maxime Buron and Hritika Kathuria and Ioana Manolescu and George Siachamis",
note = "Publisher Copyright: {\textcopyright} The Author(s), under exclusive license to Springer Nature Switzerland AG 2026.; 31st International Conference on Cooperative Information Systems, CoopIS 2025 ; Conference date: 20-10-2025 Through 22-10-2025",
year = "2026",
month = jan,
day = "1",
doi = "10.1007/978-3-032-15538-2\_18",
language = "English",
isbn = "9783032155375",
series = "Lecture Notes in Computer Science",
publisher = "Springer Science and Business Media Deutschland GmbH",
pages = "312--330",
editor = "Cinzia Cappiello and Olaf Hartig and Mohamed Sellami and Ali Ouni",
booktitle = "Cooperative Information Systems - 31st International Conference, CoopIS 2025, Proceedings",
}