{

"resourceType": "EventDefinition",
"id": "example",
"status": "draft",
"purpose": "Monitor all admissions to Emergency",
"trigger": [
  {
    "type": "named-event",
    "name": "monitor-emergency-admissions",
    "data": [
      {
        "type": "Encounter"
      }
    ],
    "condition": {
      "description": "Encounter Location = emergency (active/completed encounters, current or previous)",
      "language": "text/fhirpath",
      "expression": "(this | %previous).location.where(location = 'Location/emergency' and status in {'active', 'completed'}).exists()"
    }
  }
],
"meta": {
  "tag": [
    {
      "system": "http://terminology.hl7.org/CodeSystem/v3-ActReason",
      "code": "HTEST",
      "display": "test health data"
    }
  ]
}

}