{
  "resourceType": "ResearchElementDefinition",
  "id": "example",
  "status": "draft",
  "type": "population",
  "characteristic": [
    {
      "definitionCodeableConcept": {
        "text": "Diabetic patients over 65"
      }
    }
  ],
  "meta": {
    "tag": [
      {
        "system": "http://terminology.hl7.org/CodeSystem/v3-ActReason",
        "code": "HTEST",
        "display": "test health data"
      }
    ]
  }
}