On the decidability of query containment under constraints
PODS '98 Proceedings of the seventeenth ACM SIGACT-SIGMOD-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
Foundations of Databases: The Logical Level
Foundations of Databases: The Logical Level
Aggregate Queries Over Conditional Tables
Journal of Intelligent Information Systems
A Portrait of the Semantic Web in Action
IEEE Intelligent Systems
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
Scalar aggregation in inconsistent databases
Theoretical Computer Science - Database theory
Data integration under integrity constraints
Information Systems - Special issue: The 14th international conference on advanced information systems engineering (CAiSE*02)
Tractable Reasoning and Efficient Query Answering in Description Logics: The DL-Lite Family
Journal of Automated Reasoning
Conjunctive query containment and answering under description logic constraints
ACM Transactions on Computational Logic (TOCL)
Answering aggregate queries in data exchange
Proceedings of the twenty-seventh ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
Data Complexity of Query Answering in Expressive Description Logics via Tableaux
Journal of Automated Reasoning
AAAI'05 Proceedings of the 20th national conference on Artificial intelligence - Volume 4
Conjunctive query answering for the description logic SHIQ
Journal of Artificial Intelligence Research
EQL-lite: effective first-order query processing in description logics
IJCAI'07 Proceedings of the 20th international joint conference on Artifical intelligence
Journal on data semantics X
The limits of querying ontologies
ICDT'07 Proceedings of the 11th international conference on Database Theory
Controlled Aggregate Tree Shaped Questions over Ontologies
FQAS '09 Proceedings of the 8th International Conference on Flexible Query Answering Systems
Aggregate queries for discrete and continuous probabilistic XML
Proceedings of the 13th International Conference on Database Theory
A refinement operator based method for semantic grouping of conjunctive query results
KES'10 Proceedings of the 14th international conference on Knowledge-based and intelligent information and engineering systems: Part III
Capturing continuous data and answering aggregate queries in probabilistic XML
ACM Transactions on Database Systems (TODS)
ER'11 Proceedings of the 30th international conference on Advances in conceptual modeling: recent developments and new directions
Categorize by: deductive aggregation of semantic web query results
ESWC'10 Proceedings of the 7th international conference on The Semantic Web: research and Applications - Volume Part I
Using domain ontologies as semantic dimensions in data warehouses
ER'12 Proceedings of the 31st international conference on Conceptual Modeling
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Answering queries over ontologies is an important issue for the Semantic Web. Aggregate queries were widely studied for relational databases but almost no results are known for aggregate queries over ontologies. In this work we investigate the latter problem. We propose syntax and semantics for epistemic aggregate queries over ontologies and study query answering for MAX, MIN, COUNT, CNTD, SUM, AVG queries for the ontology language DL-LiteA.