Federated database systems for managing distributed, heterogeneous, and autonomous databases
ACM Computing Surveys (CSUR) - Special issue on heterogeneous databases
CYC: a large-scale investment in knowledge infrastructure
Communications of the ACM
Query caching and optimization in distributed mediator systems
SIGMOD '96 Proceedings of the 1996 ACM SIGMOD international conference on Management of data
Navigational plans for data integration
AAAI '99/IAAI '99 Proceedings of the sixteenth national conference on Artificial intelligence and the eleventh Innovative applications of artificial intelligence conference innovative applications of artificial intelligence
The object data standard: ODMG 3.0
The object data standard: ODMG 3.0
Information integration using logical views
Theoretical Computer Science - Special issue on the 6th International Conference on Database Theory—ICDT '97
A Uniform Framework for Integrating Knowledge in Heterogeneous Knowledge Systems
ICDE '95 Proceedings of the Eleventh International Conference on Data Engineering
Object Exchange Across Heterogeneous Information Sources
ICDE '95 Proceedings of the Eleventh International Conference on Data Engineering
MedMaker: A Mediation System Based on Declarative Specifications
ICDE '96 Proceedings of the Twelfth International Conference on Data Engineering
Don't Scrap It, Wrap It! A Wrapper Architecture for Legacy Data Sources
VLDB '97 Proceedings of the 23rd International Conference on Very Large Data Bases
Using Schema Matching to Simplify Heterogeneous Data Translation
VLDB '98 Proceedings of the 24rd International Conference on Very Large Data Bases
Generic Schema Matching with Cupid
Proceedings of the 27th International Conference on Very Large Data Bases
Using Consensus Methods for Solving Conflicts of Data in Distributed Systems
SOFSEM '00 Proceedings of the 27th Conference on Current Trends in Theory and Practice of Informatics
Translation Schemes and the Fundamental Problem of Database Design
ER '96 Proceedings of the 15th International Conference on Conceptual Modeling
Weakly Constraining Multimedia Types Based on a Type Embedding Ordering
MIS '98 Proceedings of the 4th International Workshop on Advances in Multimedia Information Systems
On the Expressive Power of Data Integration Systems
ER '02 Proceedings of the 21st International Conference on Conceptual Modeling
Scaling heterogeneous databases and the design of Disco
ICDCS '96 Proceedings of the 16th International Conference on Distributed Computing Systems (ICDCS '96)
Secure mediation: requirements, design, and architecture
Journal of Computer Security - IFIP 2000
Query-answering algorithms for information agents
AAAI'96 Proceedings of the thirteenth national conference on Artificial intelligence - Volume 1
Semantic representation of multimedia content: Knowledge representation and semantic indexing
Multimedia Tools and Applications
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In an environment of heterogeneous data sources it may be necessary to integrate these in order to provide a single global view to the data. Nowadays this problem is solved by mediators, which are tolerant not only to heterogeneity of the sources, but also of their availability and of structural changes. For some mediation problems it is reasonable to assume the existence of a fixed structured target schema as the global view. In these cases, mismatches of target concepts and source concepts can occur, which make it impossible for a mediator to interpret the data correctly and completely at the same time. We will show how to enforce correct interpretations by imposing constraints on the mappings between the target schema and the source schemas. The strength of such constraints can be decreased in a flexible and controlled way, for the sake of exploiting more sources, and at the cost of potentially loosing assurance in correctness. Additionally, we treat interpretation completeness of sources. A careful specification of data structures and algorithms allows for using mappings of this kind in a generic mediation system. The data structures represent mappings explicitly by linking structural descriptions of source data to the target schema expressed in an object oriented data model.