Abstract
Qualitative spatial representation and reasoning (QSR) [1] lends itself well to modelling by constraints. In the standard modelling approach, a spatial object, such as a region, is described by a variable, and the qualitative relation between spatial objects, such as the topological relation between two regions, contributes a constraint. We study here an alternative constraint-based formulation of QSR. In this approach, a spatial object is a constant, and the relation between spatial objects is a variable. We call this the relation-variable approach, in contrast to the conventional relation-constraint approach.
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