Fig. (4) A knowledge map graph specifying the concept “Mild Preeclampsia”. The abstracted-from relations are expressed by the directed links in the diagram. The concepts and their relations are graphically displayed in the map area (frame 1). When selecting a concept, the structures-text description is displayed (frame 2), in this case for the Proteinuria concept. For defining the constraints on the concept’s values, the editor use the interface on the bottom left area (frame 3), in this case “> =2+” and “> =0.3g”.