{
  "resourceType": "StructureDefinition",
  "url": "https://fhir.nhs.uk/StructureDefinition/NHSDigital-MessageDefinition",
  "name": "NHSDigitalMessageDefinition",
  "status": "draft",
  "fhirVersion": "4.0.1",
  "kind": "resource",
  "abstract": false,
  "type": "MessageDefinition",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/MessageDefinition",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "MessageDefinition.url",
        "path": "MessageDefinition.url",
        "min": 1,
        "mustSupport": true
      },
      {
        "id": "MessageDefinition.description",
        "path": "MessageDefinition.description",
        "min": 1,
        "mustSupport": true
      },
      {
        "id": "MessageDefinition.useContext.code",
        "path": "MessageDefinition.useContext.code",
        "binding": {
          "strength": "required",
          "valueSet": "https://fhir.nhs.uk/ValueSet/NHSDigital-usage-context-type"
        }
      },
      {
        "id": "MessageDefinition.event[x]",
        "path": "MessageDefinition.event[x]",
        "type": [
          {
            "code": "Coding"
          }
        ],
        "mustSupport": true,
        "binding": {
          "strength": "required",
          "valueSet": "https://fhir.nhs.uk/ValueSet/NHSDigital-message-events"
        }
      },
      {
        "id": "MessageDefinition.focus",
        "path": "MessageDefinition.focus",
        "min": 1,
        "mustSupport": true
      }
    ]
  }
}