code: public static Type[] getRCC8Relations(GeometricShapeVariable gv1, GeometricShapeVariable gv2) {
  		return getRelations(gv1, gv2, true);		
  	}
docs: Get the RCC8 relation(s) existing between two {@link GeometricShapeVariable}s.
  @param gv1 The first {@link GeometricShapeVariable} (the source of the directed edge).
  @param gv2 The second {@link GeometricShapeVariable} (the destination of the directed edge).
  @return The RCC8 relation(s) existing between the two given {@link GeometricShapeVariable}s.