A probabilistic relational algebra for the integration of information retrieval and database systems
ACM Transactions on Information Systems (TOIS)
Practical Lineage Tracing in Data Warehouses
ICDE '00 Proceedings of the 16th International Conference on Data Engineering
CS AKTive space: representing computer science in the semantic web
Proceedings of the 13th international conference on World Wide Web
Named graphs, provenance and trust
WWW '05 Proceedings of the 14th international conference on World Wide Web
A proof markup language for semantic web services
Information Systems - Special issue: The semantic web and web services
From SPARQL to rules (and back)
Proceedings of the 16th international conference on World Wide Web
Proceedings of the twenty-sixth ACM SIGMOD-SIGACT-SIGART symposium on Principles of database systems
LUBM: A benchmark for OWL knowledge base systems
Web Semantics: Science, Services and Agents on the World Wide Web
Explaining answers from the Semantic Web: the Inference Web approach
Web Semantics: Science, Services and Agents on the World Wide Web
Web Semantics: Science, Services and Agents on the World Wide Web
Semantics and complexity of SPARQL
ISWC'06 Proceedings of the 5th international conference on The Semantic Web
Explaining conclusions from diverse knowledge sources
ISWC'06 Proceedings of the 5th international conference on The Semantic Web
The Foundations for Provenance on the Web
Foundations and Trends in Web Science
Controlling access to RDF graphs
FIS'10 Proceedings of the Third future internet conference on Future internet
AnQL: SPARQLing up annotated RDFS
ISWC'10 Proceedings of the 9th international semantic web conference on The semantic web - Volume Part I
Using provenance to debug changing ontologies
Web Semantics: Science, Services and Agents on the World Wide Web
A general framework for representing, reasoning and querying with annotated Semantic Web data
Web Semantics: Science, Services and Agents on the World Wide Web
Exploring provenance in a linked data ecosystem
IPAW'12 Proceedings of the 4th international conference on Provenance and Annotation of Data and Processes
Ranking RDF with provenance via preference aggregation
EKAW'12 Proceedings of the 18th international conference on Knowledge Engineering and Knowledge Management
DeFacto - deep fact validation
ISWC'12 Proceedings of the 11th international conference on The Semantic Web - Volume Part I
ISWC'12 Proceedings of the 11th international conference on The Semantic Web - Volume Part I
Algebraic structures for capturing the provenance of SPARQL queries
Proceedings of the 16th International Conference on Database Theory
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The Semantic Web is based on accessing and reusing RDF data from many different-sources, which one may assign different levels of authority and credibility. Existing Semantic Web query languages, like SPARQL, have targeted the retrieval, combination and re-use of facts, but have so far ignored all aspects of meta knowledge, such as origins, authorship, recency or certainty of data. In this paper, we present an original, generic, formalized and implemented approach for managing many dimensions of meta knowledge, like source, authorship, certainty and others. The approach re-uses existing RDF modeling possibilities in order to represent meta knowledge. Then, it extends SPARQL query processing in such a way that given a SPARQL query for data, one may request meta knowledge without modifying the query proper. Thus, our approach achieves highly flexible and automatically coordinated querying for data and meta knowledge, while completely separating the two areas of concern.