Subsumption between queries to object-oriented databases
Information Systems - Special issue on extending database technology
Description logics for conceptual data modeling
Logics for databases and information systems
Description Logics in Data Management
IEEE Transactions on Knowledge and Data Engineering
A Graph-Based Framework for Multiparadigmatic Visual Access to Databases
IEEE Transactions on Knowledge and Data Engineering
Structured Objects: Modeling and Reasoning
DOOD '95 Proceedings of the Fourth International Conference on Deductive and Object-Oriented Databases
Practical Reasoning for Expressive Description Logics
LPAR '99 Proceedings of the 6th International Conference on Logic Programming and Automated Reasoning
Query-by-example: a data base language
IBM Systems Journal
A Knowledge-Based Query System for Biological Databases
FQAS '02 Proceedings of the 5th International Conference on Flexible Query Answering Systems
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The so called Visual Query Systems try to support unskilled users in formulating complex queries to highly structured databases, by providing graphic paradigms for visualizing the database conceptual models, and by allowing to build queries through visual interactions. In the present paper we propose a paradigm, for supporting the user in building sophisticated queries, based on a uniform graphical presentation of conceptual models and queries. Its most important novelty is that it is based on a semantic representation of the database conceptual models in terms of Description Logics. In this way it is possible to perform relevant inferential tasks on the query, in order to allow the user to: (i) interactively and iteratively build queries; (ii) be prevented from building inconsistent queries; (iii) interactively explore the database semantics; (iv) be gradually introduced only to those part of the conceptual model relevant for the query formulation; (v) be provided with simple, but effective, features for query refinement and query generalization.