{
  "resourceType": "StructureDefinition",
  "id": "period-duration",
  "url": "http://nictiz.nl/fhir/StructureDefinition/period-duration",
  "version": "1.0.4",
  "name": "Period Duration",
  "title": "Period Duration",
  "status": "active",
  "publisher": "Nictiz",
  "contact": [
    {
      "name": "Nictiz",
      "telecom": [
        {
          "system": "url",
          "value": "https://www.nictiz.nl",
          "use": "work"
        }
      ]
    }
  ],
  "description": "The duration of the period. Specifying a duration can only be done in conjunction with Period.start or Period.end. Example: 24 hours in a 24 hour urine specimen (which is a core element Specimen.collection.duration from FHIR R4 onwards).",
  "copyright": "CC0",
  "fhirVersion": "3.0.2",
  "mapping": [
    {
      "identity": "hcim-timeinterval-v1.0-2017EN",
      "uri": "https://zibs.nl/wiki/TimeInterval-v1.0(2017EN)",
      "name": "HCIM TimeInterval-v1.0(2017EN)"
    }
  ],
  "kind": "complex-type",
  "abstract": false,
  "contextType": "resource",
  "context": [
    "Period"
  ],
  "type": "Extension",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "Extension.extension",
        "path": "Extension.extension",
        "max": "0"
      },
      {
        "id": "Extension.url",
        "path": "Extension.url",
        "fixedUri": "http://nictiz.nl/fhir/StructureDefinition/period-duration"
      },
      {
        "id": "Extension.value[x]",
        "path": "Extension.value[x]",
        "short": "Duration",
        "alias": [
          "Tijdsduur"
        ],
        "type": [
          {
            "code": "Duration"
          }
        ],
        "mapping": [
          {
            "identity": "hcim-timeinterval-v1.0-2017EN",
            "map": "NL-CM:20.3.4",
            "comment": "Duration"
          }
        ]
      }
    ]
  }
}