From Symmetric Association Class Hop - modelint/shlaer-mellor-metamodel GitHub Wiki

When hopping from an Association Class on a Symmetric Reflexive Association, there is only one Perspective. Therefore, it is sufficient to specify only the Rnum to arrive at the only possible destination Class.

A symmetric association features only one perspective. In the Territory adjacency example we say that a Territory is adjacent to another Territory. Saying that Brazil is adjacent to Venezuela is the same as saying that Venezuela is adjacent to Brazil.

When an association class formalizes a symmetric reflexive association, there is only one way to hop from the association class and it is not necessary to specify a destination class or perspective.

images/from-symmetric-association-class-hop-10.png

Identifiers

1. Number + Path + Domain

Attributes

No non-referential attributes