On the complexity of propositional knowledge base revision, updates, and counterfactuals
Artificial Intelligence
The complexity of nested counterfactuals and iterated knowledge base revisions
Journal of Computer and System Sciences
Consistent query answers in inconsistent databases
PODS '99 Proceedings of the eighteenth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Data integration: a theoretical perspective
Proceedings of the twenty-first ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
A Portrait of the Semantic Web in Action
IEEE Intelligent Systems
Consistency Checking of Semantic Web Ontologies
ISWC '02 Proceedings of the First International Semantic Web Conference on The Semantic Web
Answering Queries Using Views over Description Logics Knowledge Bases
Proceedings of the Seventeenth National Conference on Artificial Intelligence and Twelfth Conference on Innovative Applications of Artificial Intelligence
On the decidability and complexity of query answering over inconsistent and incomplete databases
Proceedings of the twenty-second ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
The complexity of relational query languages (Extended Abstract)
STOC '82 Proceedings of the fourteenth annual ACM symposium on Theory of computing
The description logic handbook: theory, implementation, and applications
The description logic handbook: theory, implementation, and applications
Conceptual modeling with description logics
The description logic handbook
Computing consistent query answers using conflict hypergraphs
Proceedings of the thirteenth ACM international conference on Information and knowledge management
WWW '05 Proceedings of the 14th international conference on World Wide Web
Inconsistency Tolerance (Lecture Notes in Computer Science)
Inconsistency Tolerance (Lecture Notes in Computer Science)
Consistent query answering under key and exclusion dependencies: algorithms and experiments
Proceedings of the 14th ACM international conference on Information and knowledge management
IEEE Intelligent Systems
Tractable Reasoning and Efficient Query Answering in Description Logics: The DL-Lite Family
Journal of Automated Reasoning
DL-Lite: tractable description logics for ontologies
AAAI'05 Proceedings of the 20th national conference on Artificial intelligence - Volume 2
AAAI'05 Proceedings of the 20th national conference on Artificial intelligence - Volume 4
Non-standard reasoning services for the debugging of description logic terminologies
IJCAI'03 Proceedings of the 18th international joint conference on Artificial intelligence
Integrity and change in modular ontologies
IJCAI'03 Proceedings of the 18th international joint conference on Artificial intelligence
IJCAI'05 Proceedings of the 19th international joint conference on Artificial intelligence
Reasoning with inconsistent ontologies
IJCAI'05 Proceedings of the 19th international joint conference on Artificial intelligence
A framework for handling inconsistency in changing ontologies
ISWC'05 Proceedings of the 4th international conference on The Semantic Web
First-order query rewriting for inconsistent databases
ICDT'05 Proceedings of the 10th international conference on Database Theory
On the computational complexity of minimal-change integrity maintenance in relational databases
Inconsistency Tolerance
Computing minimum cost diagnoses to repair populated DL-based ontologies
Proceedings of the 17th international conference on World Wide Web
Lexicographical Inference over Inconsistent DL-Based Ontologies
RR '08 Proceedings of the 2nd International Conference on Web Reasoning and Rule Systems
Data Integration through ${\textit{DL-Lite}_{\mathcal A}}$ Ontologies
Semantics in Data and Knowledge Bases
Dealing with Inconsistencies in DL-Lite Ontologies
ESWC 2009 Heraklion Proceedings of the 6th European Semantic Web Conference on The Semantic Web: Research and Applications
Measuring Inconsistency in DL-Lite Ontologies
WI-IAT '09 Proceedings of the 2009 IEEE/WIC/ACM International Joint Conference on Web Intelligence and Intelligent Agent Technology - Volume 01
Inconsistency-tolerant semantics for description logics
RR'10 Proceedings of the Fourth international conference on Web reasoning and rule systems
Paraconsistent query answering over DL-Lite ontologies
Web Intelligence and Agent Systems
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Description Logics (DLs) have been widely used in the last years as formal language for specifying ontologies over the web. Due to the dynamic nature of this setting, it may frequently happen that data retrieved from the web contradict the intensional knowledge provided by the ontology through which they are collected, which therefore may result inconsistent. In this paper, we analyze the problem of consistent query answering over DL ontologies, i.e., the problem of providing meaningful answers to queries posed over inconsistent ontologies. We provide inconsistency tolerant semantics for DLs, and study the computational complexity of consistent query answering over ontologies specified in DL-Lite, a family of DLs specifically tailored to deal with large amounts of data. We show that the above problem is coNP-complete w.r.t. data complexity, i.e., the complexity measured w.r.t. the size of the data only. Towards identification of tractable cases of consistent query answering over DL-Lite ontologies, we then study the problem of consistent instance checking, i.e., the instance checking problem considered under our inconsistency-tolerant semantics. We provide an algorithm for it which runs in time polynomial in the size of the data, thus showing that the problem is in PTIME w.r.t. data complexity.