Clause 7.6 deals with symbols and graphics. The subject is the visual element of a statement. A symbol or graphic can carry a claim more forcefully than words, so the clause treats it as part of the statement. A programme that meets the clause can show what each symbol means, where it came from and that its use is authorised.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.