In A.8 Requirements, figure 69, there are several compartments named 'references', but I cannot find the graphical notation rule associated to them. The notation I found in 8.2.3.6 is a white or black diamond.

Is the graphical notation missing something for the compartment, or is there an issue with the example?
In A.8 Requirements, figure 69, there are several compartments named 'references', but I cannot find the graphical notation rule associated to them. The notation I found in 8.2.3.6 is a white or black diamond.
Is the graphical notation missing something for the compartment, or is there an issue with the example?