Inner and outer bipolarity in database querying

Recently a new line of research on database querying has been triggered by the observation that humans usually express their preferences using both positive and negative statements. This results in semantically richer bipolar queries consisting of conditions of the two types, where conditions of the former type express satisfactory or desired properties of data sought, while conditions of the latter type are used to express properties the user finds unsatisfactory or ineligible. We present a novel framework for evaluating bipolar queries - a technique that allows for a proper representation of hesitation and conflicts together with modeling needs and wishes of the user, where bipolar satisfaction degrees are implemented to model hesitation and conflicts, and possibilisic interpretation of “and possibly” operator is implemented to model user´s needs and wishes. Furthermore, simple, but illustrative, examples of application of the introduced framework are presented and its properties with regard to various interpretations of implication implemented in the “and possibly” operator are studied.