Requêtes flexibles avec des concepts disjonctifs


In the context of flexible DB querying system, this paper introduces a novel strategy implementing the Querying By Example paradigm, named DCQ standing for Disjunctive Concept Querying, that extends a flexible querying system with subjective disjunctive concepts : it proposes two stored procedures that can be embedded in any relational database management system to build a formal query from a few user-given examples that represent the diversity of what the user is looking for. The first procedure infers the membership function of the implicit imprecise concept underlying the provided examples, with the specificity of allowing for complex disjunctive concepts : it is able to both capture properties shared by most of the selected representative tuples as well as specific properties possessed by only one specific representative tuple. The second procedure allows to exploit the resulting fuzzy concept in a query.