如何在FHIR中使用扩展来扩展原始数据类型？

{
  "url": "http://example.com/fhir/extensions/patient-identifier",
  "name": "PatientIdentifierExtension",
  "status": "active",
  "type": {
    "system": "http://hl7.org/fhir/data-types",
    "code": "string"
  },
  "description": "A custom patient identifier used by Example Hospital."
}

{
  "resourceType": "Patient",
  "id": "example",
  "extension": [
    {
      "url": "http://example.com/fhir/extensions/patient-identifier",
      "valueString": "EX12345"
    }
  ],
  "name": [
    {
      "use": "official",
      "family": "Doe",
      "given": ["John"]
    }
  ]
}

import json

# 定义扩展
extension = {
    "url": "http://example.com/fhir/extensions/patient-identifier",
    "valueString": "EX12345"
}

# 创建Patient资源
patient = {
    "resourceType": "Patient",
    "id": "example",
    "extension": [extension],
    "name": [
        {
            "use": "official",
            "family": "Doe",
            "given": ["John"]
        }
    ]
}

# 输出JSON
print(json.dumps(patient, indent=2))