Each item of dangerous goods is matched to its UN number and proper shipping name drawn from the list, using the most specific entry available, the generic or not-otherwise-specified entries where no specific entry exists, the Australian-specific entries where they apply, and the technical name supplement where a special provision requires it. The chosen entry drives every downstream duty: packing instruction, limited quantity amount, labels, placards and documentation.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.