{
  "description": "This is a widely used term used to correlate the same request / event across logs with an arbitrary (but unique) value.\\r\\n\\r\\nThis can be implemented so that the response contains an un-changed Correlation ID \\r\\n\\r\\nIn Spine http requests this will match the value of NHSD-Correlation-ID header.",
  "_filename": "Extension-NHSDigital-MessageHeader-messageId.StructureDefinition.json",
  "package_name": "uk.nhsdigital.r4",
  "date": null,
  "derivation": "constraint",
  "publisher": null,
  "fhirVersion": "4.0.1",
  "name": "ExtensionMessageHeadermessageId",
  "mapping": [ {
    "uri": "http://hl7.org/v3",
    "name": "RIM Mapping",
    "identity": "rim"
  } ],
  "abstract": false,
  "type": "Extension",
  "experimental": null,
  "resourceType": "StructureDefinition",
  "title": null,
  "package_version": "2.4.6",
  "status": "draft",
  "id": "b60ff0e6-b34e-47a0-930c-e4786660acb9",
  "kind": "complex-type",
  "url": "https://fhir.nhs.uk/StructureDefinition/Extension-MessageHeader-messageId",
  "context": [ {
    "type": "element",
    "expression": "MessageHeader"
  } ],
  "version": null,
  "differential": {
    "element": [ {
      "id": "Extension.url",
      "path": "Extension.url",
      "fixedUri": "https://fhir.nhs.uk/StructureDefinition/Extension-MessageHeader-messageId"
    }, {
      "id": "Extension.value[x]",
      "min": 1,
      "path": "Extension.value[x]",
      "type": [ {
        "code": "Identifier"
      } ]
    } ]
  },
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension"
}