If a symbol for an element that appears on a Package Diagram is not directly within the namespace of the context of that Diagram show the fully qualified name. This policy works well for Package Diagrams, where the symbol for the Package itself does not usually appear in its own Package Diagram.
In Magic Cyber-Systems Engineer® (Cameo Systems Modeler®) Webel recommends the following:
Alternatively, another device for indicating ownership may be used, such as showing the element graphically/visually within a Package or Model package symbol (in which case the namespace of that container might also need to be indicated). However, this approach is usually NOT recommended according to Webel Best Practice as the Diagram can "break" if the ownership is changed elsewhere.
You may also use a Containment operator, but it may "vanish" from the Diagram if the ownership is changed elsewhere:The SysMLv1.7 policy does not however strictly work well with the highly recommended Webel "Focus" BDD approach, where a "focus" Block is shown in its own BDD.
In general, you can use your common sense in this matter. Where the ownership of any Element shown in a Diagram is not clear in context, use one of the above ways to indicate ownership.