From Asymmetric Association Class Hop
If the Association is Asymmetric, it has two distinct Perspectives, so you need to specify which one is the destination of the Hop.
In any action language, therefore, it is sufficient to specify either Perspective name (verb phrase) or destination Class for a Non Reflexive Association. In the case of a Reflexive Association, however, the Perspective must be supplied (since the Class is the same on either side).
- Number + Path + Domain
No non-referential attributes