{

"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"
    }
  ]
}

}