Reasoning with individuals in concept languages
Data & Knowledge Engineering
Combining fuzzy information from multiple systems (extended abstract)
PODS '96 Proceedings of the fifteenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Complexity of answering queries using materialized views
PODS '98 Proceedings of the seventeenth ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Fuzzy sets as a basis for a theory of possibility
Fuzzy Sets and Systems
Levelwise Search and Borders of Theories in KnowledgeDiscovery
Data Mining and Knowledge Discovery
Multi-User View Integration System (MUVIS): An Expert System for View Integration
Proceedings of the Sixth International Conference on Data Engineering
Answering queries using views: A survey
The VLDB Journal — The International Journal on Very Large Data Bases
Using Fagin's Algorithm for Merging Ranked Results in Multimedia Middleware
COOPIS '99 Proceedings of the Fourth IECIS International Conference on Cooperative Information Systems
The description logic handbook: theory, implementation, and applications
The description logic handbook: theory, implementation, and applications
Answering queries from statistics and probabilistic views
VLDB '05 Proceedings of the 31st international conference on Very large data bases
Data integration with uncertainty
VLDB '07 Proceedings of the 33rd international conference on Very large data bases
Bootstrapping pay-as-you-go data integration systems
Proceedings of the 2008 ACM SIGMOD international conference on Management of data
A Crisp Representation for Fuzzy $\cal SHOIN$ with Fuzzy Nominals and General Concept Inclusions
Uncertainty Reasoning for the Semantic Web I
Towards a Scalable Query Rewriting Algorithm in Presence of Value Constraints
Journal on Data Semantics XII
A semantics and complete algorithm for subsumption in the classic description logic
Journal of Artificial Intelligence Research
Reasoning within fuzzy description logics
Journal of Artificial Intelligence Research
Expressive reasoning with horn rules and fuzzy description logics
RR'07 Proceedings of the 1st international conference on Web reasoning and rule systems
sPLMap: a probabilistic approach to schema matching
ECIR'05 Proceedings of the 27th European conference on Advances in Information Retrieval Research
Schema integration based on uncertain semantic mappings
ER'05 Proceedings of the 24th international conference on Conceptual Modeling
| Hi-index | 0.00 |
This paper proposes an approach to the tolerant rewriting of queries in terms of views when the views and the queries may involve fuzzy value constraints in the context of a Local-As-View mediation system. These constraints describe attribute values as a set of elements attached with a degree in [0, 1] that expresses the plausibility attached to a given element, i.e., attribute values more or less plausible/typical in the views, while in the queries, they denotes preferences, i.e., more or less desired values. The problem of rewriting queries is formalized in the setting of the description logic FL0 extended to fuzzy value constraints. We propose an algorithm of gradual and structural subsumption for this extended logic, that plays a key role in the query rewriting algorithm. Finally, we characterize the tolerant query rewriting forms and propose an algorithm to compute them.