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Source1

{
  "resourceType": "CodeSystem",
  "id": "json-empty-behavior",
  "text": {
    "status": "generated",
    "div": "<!-- snip (see above) -->"
  },
  "extension": [
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
      "valueInteger": 4
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
      "valueCode": "fhir"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
      "valueCode": "informative",
      "_valueCode": {
        "extension": [
          {
            "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
            "valueUri": "http://hl7.org/fhir/tools/ImplementationGuide/hl7.fhir.uv.tools"
          }
        ]
      }
    }
  ],
  "url": "http://hl7.org/fhir/tools/CodeSystem/json-empty-behavior",
  "identifier": {
    "system": "urn:ietf:rfc:3986",
    "value": "urn:oid:2.16.840.1.113883.4.642.40.1.16.10"
  },
  "version": "1.0.0",
  "name": "JsonEmptyBehaviorCodes",
  "title": "Json Empty Behavior Codes",
  "status": "active",
  "experimental": false,
  "date": "2026-02-04T08:29:03+11:00",
  "publisher": "HL7 International / FHIR Infrastructure",
  "contact": [
    {
      "telecom": [
        {
          "system": "url",
          "value": "http://www.hl7.org/Special/committees/fiwg"
        }
      ]
    }
  ],
  "description": "empty-behaviour: what should be in JSON when a repeating elements has no items. Can be absent, present, or either",
  "jurisdiction": [
    {
      "coding": [
        {
          "system": "http://unstats.un.org/unsd/methods/m49/m49.htm",
          "code": "001"
        }
      ]
    }
  ],
  "caseSensitive": true,
  "content": "complete",
  "concept": [
    {
      "code": "absent",
      "display": "absent",
      "definition": "When there's no items, the json property for the array must be missing"
    },
    {
      "code": "present",
      "display": "present",
      "definition": "When there's no items, the json property for the array must be present and empty"
    },
    {
      "code": "either",
      "display": "either",
      "definition": "When there's no items, the json property for the array may be present and empty, or absent"
    }
  ]
}