A PCBU has a duty to consult workers, and their HSRs where they have them, on health and safety matters, and to consult people who share a duty for the same matter, for example a security guard employed by a private company but contracted to a hospital may be owed duties by both. References in the code to consulting workers include consulting their HSRs.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.