{
  "resourceType": "ValueSet",
  "id": "yes-no-unknown-test",
  "url": "http://example.org/fhir/ValueSet/yes-no-unknown",
  "version": "1.0.0",
  "name": "YesNoUnknown",
  "title": "Yes / No / Unknown",
  "status": "active",
  "experimental": false,
  "date": "2026-05-08",
  "publisher": "Example Org",
  "description": "A simple value set with three answers: yes, no, or unknown.",
  "compose": {
    "include": [
      {
        "system": "http://terminology.hl7.org/CodeSystem/v2-0136",
        "concept": [
          {
            "code": "Y",
            "display": "Yes"
          },
          {
            "code": "N",
            "display": "No"
          }
        ]
      },
      {
        "system": "http://terminology.hl7.org/CodeSystem/v3-NullFlavor",
        "concept": [
          {
            "code": "UNK",
            "display": "Unknown"
          }
        ]
      }
    ]
  }
}