{
  "resourceType": "EventDefinition",
  "id": "example",
  "text": {
    "status": "generated",
    "div": "<div xmlns=\"http://www.w3.org/1999/xhtml\">\n    </div>"
  },
  "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()"
      }
    }
  ]
}