UMLR — Link notation for instance diagrams does not cope with multiple classifiers

Figure 7.54 of ptc/06-01-02 shows an Instance Diagram notation for a
Link.
With the accompanying text:
"An instance specification whose classifier is an association represents
a link and is shown using the same notation as for
an association, but the solid path or paths connect instance
specifications rather than classifiers. It is not necessary to
show an underlined name where it is clear from its connection to
instance specifications that it represents a link and not
an association. End names can adorn the ends. Navigation arrows can be
shown, but if shown, they must agree with the
navigation of the association ends."

However this does not cater for the fact that the metamodel allows an
InstanceSpecification to be associated with many Classifiers.

Proposed resolution:
Extend the metamodel for Instances to explicitly model Links. For a good
start see the instances model in the MOF2 Core Abstract Semantics
chapter (it is not part of MOF - it is only there to explain the
semantics of MOF in terms of metamodel instances).