{
  "resourceType": "StructureDefinition",
  "id": "StructureDefinition-map-xd-metadata-preservation",
  "url": "http://objects.directtrust.org/standards/artifacts/StructureDefinition/StructureDefinition-map-xd-metadata-preservation",
  "version": "20261102",
  "name": "map_xd_metadata_preservation",
  "title": "MAP XD metadata preservation",
  "status": "draft",
  "date": "2026-11-02",
  "description": "Preserves a named XD metadata value without changing the semantics of a native FHIR mapping; for metadata without an exact FHIR R4 field.",
  "fhirVersion": "4.0.1",
  "kind": "complex-type",
  "abstract": false,
  "type": "Extension",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation": "constraint",
  "context": [
    {
      "type": "element",
      "expression": "List"
    },
    {
      "type": "element",
      "expression": "DocumentReference"
    }
  ],
  "differential": {
    "element": [
      {
        "id": "Extension",
        "path": "Extension",
        "short": "MAP XD metadata preservation",
        "definition": "Preserves a named XD metadata value without changing the semantics of a native FHIR mapping; for metadata without an exact FHIR R4 field."
      },
      {
        "id": "Extension.extension",
        "path": "Extension.extension",
        "slicing": {
          "discriminator": [
            {
              "type": "value",
              "path": "url"
            }
          ],
          "rules": "closed"
        },
        "min": 2,
        "max": "*"
      },
      {
        "id": "Extension.extension:fieldName",
        "path": "Extension.extension",
        "sliceName": "fieldName",
        "min": 1,
        "max": "1",
        "type": [
          {
            "code": "Extension"
          }
        ]
      },
      {
        "id": "Extension.extension:fieldName.url",
        "path": "Extension.extension.url",
        "fixedUri": "fieldName"
      },
      {
        "id": "Extension.extension:fieldName.value[x]",
        "path": "Extension.extension.value[x]",
        "min": 1,
        "max": "1",
        "type": [
          {
            "code": "string"
          }
        ]
      },
      {
        "id": "Extension.extension:xdValue",
        "path": "Extension.extension",
        "sliceName": "xdValue",
        "min": 1,
        "max": "1",
        "type": [
          {
            "code": "Extension"
          }
        ]
      },
      {
        "id": "Extension.extension:xdValue.url",
        "path": "Extension.extension.url",
        "fixedUri": "xdValue"
      },
      {
        "id": "Extension.extension:xdValue.value[x]",
        "path": "Extension.extension.value[x]",
        "min": 1,
        "max": "1",
        "type": [
          {
            "code": "string"
          }
        ]
      },
      {
        "id": "Extension.url",
        "path": "Extension.url",
        "fixedUri": "http://objects.directtrust.org/standards/artifacts/StructureDefinition/StructureDefinition-map-xd-metadata-preservation"
      },
      {
        "id": "Extension.value[x]",
        "path": "Extension.value[x]",
        "max": "0"
      }
    ]
  }
}