-------------------------------
   |                               | 
   |  object --> cursor            | 
   |    |           |              | 
   |    |           |              | 
   |  (meta)link    relation       | 
   |    |             |            | 
   |    |             |            | 
   |  interruption     ->pretense  | 
   |        |                      | 
   |        |--------- closed      | 
   |        |             |        | 
   |         --open       |        | 
   |            |        limit     | 
   |            |                  | 
   |             ------>limit(s)   | 
   |                               | 
    ------------------------------