callout node.
Here all calls to the corresponding role method will be forwarded to the base method.
The purpose of the Java call hierarchy view is to statically display all potential control flows originating from or leading to a specific program element. Since callout and callin method bindings in OT/J introduce new kinds of control flows, it is only appropriate to also visualize the control flows induced by such method bindings.
Whenever a given method can be invoked via a callout method binding,
the call hierarchy shows a callout node.
Here all calls to the corresponding role method will be forwarded to the base method.
Whenever a callin method binding may intercept a given control flow,
a 
callin node is shown.
Note, that a callin control flow is only taken at runtime,
if the enclosing team is active and no guard predicate evaluates to false.
