UML14 — UML Semantics, p 81, 145

Summary: The Semantics introduces AssociationRole and AssociationEndRole wich inherits from the original Association and AssociationEnd (p81). Unfortunately, the xxxRole have a mandatory xxx as a "base" (multiplicity 1). I believe this is a bug, since it forces you to create an explicit association between the Classifiers, even for a

link, etc. Suggested correction: make the base optional (multiplicity 0,1) for AssociationEndRole with constraint base, local, global, self or parameter; make it optional too for related AssociationRole; leave it as is (mandatory) for ClassifierRole. Make it mandatory through OCL constraints for other AssociationEndRoles and AssociationRoles.

Redundant with issue# 1019.