The five identifiers (UN number, name, class or division, subsidiary hazard and packing group) come before the rest of the description; where the description is typed as a single string, as on the multimodal form, those five appear in that order with nothing in between except as the Code allows. Anything a competent authority or another mode requires goes after the description, and a sketch of where the goods sit in the unit is encouraged.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.