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FQAS'11 Proceedings of the 9th international conference on Flexible Query Answering Systems
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This paper proposes an approach aimed at obviating empty answers for a family of conjunctive queries involving value constraints. Contrary to the approaches based on a relaxation of the predicates involved in the query, the principle suggested here consists in replacing the query by a similar one which has been processed previously and whose answer is known to be non-empty. This technique thus avoids the combinatory explosion induced by classical relaxation-based approaches.