E.g. in SysML it is not unusual, having ports and properties with no name in cases where the port/property is typed/classified (at least as long as there is only on port/property of that type).
However due to the fact that the Relationship Matrix do not allow to show the type, those unnamed elements cannot be identified by the user.
An option to show the type of the element as well would allow to use the Relationship Matrix for unnamed elements as well.