An after-hours service rarely holds a full health summary, so each event summary must capture what matters. For every encounter the record and the report to the regular practice include the patient's known allergies, or that none are known, in the designated field so that prescribing alerts work, and where relevant the adverse drug reactions, current medicines, current health problems and relevant past history the patient or carer reported, together with what the service found and did. The service audits event summaries for completeness.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.