Contextual Bipolar Database Queries: A Conjunctive and Disjunctive Perspective

We extend our approach to bipolar database queries which makes it possible to use a necessary (required, mndatory, obligatory) and optional (desired) condition connected with a non-conventional aggregation operator “and, if possible” exemplified by “find a house which is “inexpensive” and, if possible, located possibly ‘close to public transportation”’ in which “and, if possible,...” is not the traditional “and”. We extend first this formulation by context exemplified by “find houses which are inexpensive and – if possible, with respect to other houses in town – are possibly close to public transportation”. We use a logical representation of the “and, if possible...” operator but also mention some other ones, notably based on the winnow operator. Moreover, we present a new formulation of a contextual bipolar query, “find a house which is inexpensive or - if impossible, with respect to other houses in own – is new”. We mention an inclusive and exclusive character of these two formulations. We present a context awareness related view of these bipolar queries, and provide some remarks on intention awareness.