Federated database systems for managing distributed, heterogeneous, and autonomous databases
ACM Computing Surveys (CSUR) - Special issue on heterogeneous databases
Automated resolution of semantic heterogeneity in multidatabases
ACM Transactions on Database Systems (TODS)
CoBase: a scalable and extensible cooperative information system
Journal of Intelligent Information Systems - Special issue on intelligent integration of information
The TSIMMIS Approach to Mediation: Data Models and Languages
Journal of Intelligent Information Systems - Special issue: next generation information technologies and systems
OntoSeek: Content-Based Access to the Web
IEEE Intelligent Systems
EKAW '00 Proceedings of the 12th European Workshop on Knowledge Acquisition, Modeling and Management
Approximate Query Translation Across Heterogeneous Information Sources
VLDB '00 Proceedings of the 26th International Conference on Very Large Data Bases
Semantic Integration in Heterogeneous Databases Using Neural Networks
VLDB '94 Proceedings of the 20th International Conference on Very Large Data Bases
Neural Network Technology to Support View Integration
OOER '95 Proceedings of the 14th International Conference on Object-Oriented and Entity-Relationship Modelling
Resolving Ontological Heterogeneity in the KRAFT Project
DEXA '99 Proceedings of the 10th International Conference on Database and Expert Systems Applications
Exploiting Hierarchical Global Views for Query Reformulation
KDEX '99 Proceedings of the 1999 Workshop on Knowledge and Data Engineering Exchange
A Conceptual Indexing Method for Content-Based Retrieval
DEXA '99 Proceedings of the 10th International Workshop on Database & Expert Systems Applications
Using Ontologies for Domain Information Retrieval
DEXA '00 Proceedings of the 11th International Workshop on Database and Expert Systems Applications
Dynamic Integration and Query Processing with Ranked Role Sets
COOPIS '96 Proceedings of the First IFCIS International Conference on Cooperative Information Systems
A Schema Analysis and Reconciliation Tool Environment for Heterogeneous Databases
IDEAS '99 Proceedings of the 1999 International Symposium on Database Engineering & Applications
A Web Site Indexing Process for an Internet Information Retrieval Agent System
WISE '00 Proceedings of the First International Conference on Web Information Systems Engineering (WISE'00)-Volume 1 - Volume 1
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The global information management scenario requires support systems which help the user in discovering interesting information contained in heterogeneous sources spread through all over the world. In the present paper, we introduce the notion of hierarchical global concepts to support the flexible management of imprecise and heterogeneous representation of information. In particular, we show how the characteristics of a cluster hierarchy can be exploited in the query reformulation phase in order to comply with the user imprecise and uncertain information requirements. The technique has been implemented in a FIPA compliant multi-agent system, with a mediator-like architecture.