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Extensions

The specification is not prescriptive about support for extensions. However, to support extensions, the specification reserves the name extension and will never define an element with that name, allowing implementations to use it to provide custom behavior and information. The value of an extension element MUST be a pre-coordinated JSON object. For example, an extension on a notification could look like this:

{
 "context": [{
   "key": "patient",
   "resource": {
    "resourceType": "Patient",
    "id": "ewUbXT9RWEbSj5wPEdgRaBw3"
   }
  },
  {
   "key": "extension",
   "data": {
    "user-timezone": "+1:00"
   }
  }
 ]
}