'Bridged' relations

(No idea how this concept is called, so hence the vague subject of this posting).

When one is using multiple classes and relations between them the relations cross each other. Is there a way to make a ‘bridge’ in a relationship to show these are not all connected with each other, but only connected to one other class?

Normal/Crossed:


           class
             |
             |
   class-----|-----class
             |
             |
           class

Bridged:


           class
             |
             |
   class----(-----class
             |
             |
           class