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Source1

{
  "description": "A modifier extension for ElementDefinition that indicates the element uses a custom non-FHIR type. Supported types include 'any' (arbitrary JSON value), 'password' (sensitive credential), 'secret' (encrypted sensitive data), etc.",
  "derivation": "constraint",
  "fhirVersion": "4.3.0",
  "name": "CustomType",
  "abstract": false,
  "type": "Extension",
  "resourceType": "StructureDefinition",
  "title": "Custom Type",
  "status": "active",
  "id": "custom-type",
  "kind": "complex-type",
  "url": "http://health-samurai.io/fhir/core/StructureDefinition/additional-properties-custom-type",
  "context": [
    {
      "type": "element",
      "expression": "ElementDefinition.type"
    }
  ],
  "version": "0.2602.0",
  "differential": {
    "element": [
      {
        "id": "Extension",
        "path": "Extension",
        "short": "Marks element as using custom non-FHIR type",
        "definition": "When present, indicates that the element uses a custom type not defined in the FHIR specification.",
        "min": 0,
        "max": "1",
        "isModifier": true,
        "isModifierReason": "This extension fundamentally changes the validation behavior of the element, allowing values of a custom type instead of FHIR-typed values"
      },
      {
        "id": "Extension.extension",
        "path": "Extension.extension",
        "max": "0"
      },
      {
        "id": "Extension.url",
        "path": "Extension.url",
        "fixedUri": "http://health-samurai.io/fhir/core/StructureDefinition/additional-properties-custom-type"
      },
      {
        "id": "Extension.value[x]",
        "path": "Extension.value[x]",
        "short": "Custom type code",
        "definition": "The code identifying the custom type: 'any' for arbitrary JSON, 'password' for sensitive credentials, 'secret' for encrypted data, etc.",
        "min": 1,
        "max": "1",
        "type": [
          {
            "code": "code"
          }
        ]
      }
    ]
  },
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension"
}