Abstract
Since many years, research on flexible querying of regular databases aims at making database systems better accessible, and this by allowing queries to be formulated in a more human consistent manner. In general, this is done by allowing the user to express preferences, which are not necessarily strict, but can be approximately specified. As a result, a satisfaction degree can be calculated for each record in the database, expressing the degree to which the particular record satisfies the users preferences. In addition to this, bipolar querying adds the notion of both positive and negative preferences in handling flexible queries. The reason for this is that it is sometimes more feasible for a user to express what is undesirable than to express what is desirable. Moreover, satisfactory and unsatisfactory cases do not necessarily have to be each others reverse, which is called heterogeneous bipolarity. To deal with this heterogeneous bipolarity, this paper introduces a new bipolar query satisfaction modeling framework, where, besides a satisfaction degree, also an independent dissatisfaction degree is used.
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