Data integration: a theoretical perspective
Proceedings of the twenty-first ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
The description logic handbook: theory, implementation, and applications
The description logic handbook: theory, implementation, and applications
Complexity of the Two-Variable Fragment with Counting Quantifiers
Journal of Logic, Language and Information
Tractable Reasoning and Efficient Query Answering in Description Logics: The DL-Lite Family
Journal of Automated Reasoning
Fusions of description logics and abstract description systems
Journal of Artificial Intelligence Research
Modular reuse of ontologies: theory and practice
Journal of Artificial Intelligence Research
Conservative extensions in expressive description logics
IJCAI'07 Proceedings of the 20th international joint conference on Artifical intelligence
IJCAI'05 Proceedings of the 19th international joint conference on Artificial intelligence
Data complexity of reasoning in very expressive description logics
IJCAI'05 Proceedings of the 19th international joint conference on Artificial intelligence
Model-theoretic inseparability and modularity of description logic ontologies
Artificial Intelligence
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To enable ontology reuse, the Web Ontology Language (OWL) allows an ontology κv to import an ontology κh. To reason with such a κv, a reasoner needs physical access to the axioms of κh. For copyright and/or privacy reasons, however, the authors of κh might not want to publish the axioms of κh; instead, they might prefer to provide an oracle that can answer a (limited) set of queries over κh, thus allowing κv to import κh "by query." In this paper, we study import-by-query algorithms, which can answer questions about κv ∪ κh by accessing only κv and the oracle. We show that no such algorithm exists in general, and present restrictions under which importing by query becomes feasible.