An epistemic operator for description logics
Artificial Intelligence
Description logics of minimal knowledge and negation as failure
ACM Transactions on Computational Logic (TOCL)
Foundations of Databases: The Logical Level
Foundations of Databases: The Logical Level
TARK '88 Proceedings of the 2nd conference on Theoretical aspects of reasoning about knowledge
Communications of the ACM - ACM at sixty: a look back in time
Translating SQL Applications to the Semantic Web
DEXA '08 Proceedings of the 19th international conference on Database and Expert Systems Applications
The Expressive Power of SPARQL
ISWC '08 Proceedings of the 7th International Conference on The Semantic Web
Mining the Content of Relational Databases to Learn Ontologies with Deeper Taxonomies
WI-IAT '08 Proceedings of the 2008 IEEE/WIC/ACM International Conference on Web Intelligence and Intelligent Agent Technology - Volume 01
Bridging the gap between OWL and relational databases
Web Semantics: Science, Services and Agents on the World Wide Web
Semantics and complexity of SPARQL
ACM Transactions on Database Systems (TODS)
EQL-lite: effective first-order query processing in description logics
IJCAI'07 Proceedings of the 20th international joint conference on Artifical intelligence
Effective query rewriting with ontologies over DBoxes
IJCAI'09 Proceedings of the 21st international jont conference on Artifical intelligence
Interpreting relational databases in the RDF domain
Proceedings of the sixth international conference on Knowledge capture
Epistemic querying of OWL knowledge bases
ESWC'11 Proceedings of the 8th extended semantic web conference on The semantic web: research and applications - Volume Part I
Review: survey of directly mapping sql databases to the semantic web
The Knowledge Engineering Review
Querying Semantic Data on the Web?
ACM SIGMOD Record
Converting relational to graph databases
First International Workshop on Graph Data Management Experiences and Systems
Ultrawrap: SPARQL execution on relational data
Web Semantics: Science, Services and Agents on the World Wide Web
RDB2RDF: completed transformation from relational database into RDF ontology
Proceedings of the 8th International Conference on Ubiquitous Information Management and Communication
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Mapping relational databases to RDF is a fundamental problem for the development of the Semantic Web. We present a solution, inspired by draft methods defined by the W3C where relational databases are directly mapped to RDF and OWL. Given a relational database schema and its integrity constraints, this direct mapping produces an OWL ontology, which, provides the basis for generating RDF instances. The semantics of this mapping is defined using Datalog. Two fundamental properties are information preservation and query preservation. We prove that our mapping satisfies both conditions, even for relational databases that contain null values. We also consider two desirable properties: monotonicity and semantics preservation. We prove that our mapping is monotone and also prove that no monotone mapping, including ours, is semantic preserving. We realize that monotonicity is an obstacle for semantic preservation and thus present a non-monotone direct mapping that is semantics preserving.