Knowledge compilation and theory approximation
Journal of the ACM (JACM)
Complexity and expressive power of logic programming
ACM Computing Surveys (CSUR)
A Conjunctive Query Language for Description Logic Aboxes
Proceedings of the Seventeenth National Conference on Artificial Intelligence and Twelfth Conference on Innovative Applications of Artificial Intelligence
Description logic programs: combining logic programs with description logic
WWW '03 Proceedings of the 12th international conference on World Wide Web
Pellet: A practical OWL-DL reasoner
Web Semantics: Science, Services and Agents on the World Wide Web
Reasoning in Description Logics by a Reduction to Disjunctive Datalog
Journal of Automated Reasoning
Hexastore: sextuple indexing for semantic web data management
Proceedings of the VLDB Endowment
Approximate OWL-Reasoning with Screech
RR '08 Proceedings of the 2nd International Conference on Web Reasoning and Rule Systems
Implementing an Inference Engine for RDFS/OWL Constructs and User-Defined Rules in Oracle
ICDE '08 Proceedings of the 2008 IEEE 24th International Conference on Data Engineering
Semantics and complexity of SPARQL
ACM Transactions on Database Systems (TODS)
Modular reuse of ontologies: theory and practice
Journal of Artificial Intelligence Research
First order LUB approximations: characterization and algorithms
Artificial Intelligence - Special volume on reformulation
The RDF-3X engine for scalable management of RDF data
The VLDB Journal — The International Journal on Very Large Data Bases
Hypertableau reasoning for description logics
Journal of Artificial Intelligence Research
LUBM: A benchmark for OWL knowledge base systems
Web Semantics: Science, Services and Agents on the World Wide Web
YARS2: a federated repository for querying graph structured data from the web
ISWC'07/ASWC'07 Proceedings of the 6th international The semantic web and 2nd Asian conference on Asian semantic web conference
Towards scalable instance retrieval over ontologies
KSEM'10 Proceedings of the 4th international conference on Knowledge science, engineering and management
Datalog+/-: A Family of Logical Knowledge Representation and Query Languages for New Applications
LICS '10 Proceedings of the 2010 25th Annual IEEE Symposium on Logic in Computer Science
Optimizing enterprise-scale OWL 2 RL reasoning in a relational database system
ISWC'10 Proceedings of the 9th international semantic web conference on The semantic web - Volume Part I
Programming Support Innovations for Emerging Distributed Applications
OWLIM: A family of scalable semantic repositories
Semantic Web
A comparison of reasoning techniques for querying large description logic ABoxes
LPAR'06 Proceedings of the 13th international conference on Logic for Programming, Artificial Intelligence, and Reasoning
Towards a complete OWL ontology benchmark
ESWC'06 Proceedings of the 3rd European conference on The Semantic Web: research and applications
What to ask to an incomplete semantic web reasoner?
IJCAI'11 Proceedings of the Twenty-Second international joint conference on Artificial Intelligence - Volume Volume Three
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Triple stores implementing the RL profile of OWL 2 are becoming increasingly popular. In contrast to unrestricted OWL 2, the RL profile is known to enjoy favourable computational properties for query answering, and state-of-the-art RL reasoners such as OWLim and Oracle's native inference engine of Oracle Spatial and Graph have proved extremely successful in industry-scale applications. The expressive restrictions imposed by OWL 2 RL may, however, be problematical for some applications. In this paper, we propose novel techniques that allow us (in many cases) to compute exact query answers using an off-the-shelf RL reasoner, even when the ontology is outside the RL profile. Furthermore, in the cases where exact query answers cannot be computed, we can still compute both lower and upper bounds on the exact answers. These bounds allow us to estimate the degree of incompleteness of the RL reasoner on the given query, and to optimise the computation of exact answers using a fully-fledged OWL 2 reasoner. A preliminary evaluation using the RDF Semantic Graph feature in Oracle Database has shown very promising results with respect to both scalability and tightness of the bounds.