Connection between Instances.
A Link is an Instance of an Association. It has a set of LinkEnds that matches the set of AssociationEnds of the Association. Links can be used as Connectors between Parts or Ports in UML 2.0, or they can be Links between Instances. In Modelio, a Link belongs to no element. When a Link acts as a Connector between Parts and/or Ports, these Parts or Ports should belong to the same context (be inside the same Collaboration, Classifier, and so on).
: Link (architecture_autodiagram)
Figure 219 : Link (architecture_autodiagram)
Model : Association [0..1]
LinkEnd : LinkEnd [2..2]
Sent : CommunicationChannel [0..1]