{
  "resourceType": "StructureDefinition",
  "id": "signal-documentreference",
  "url": "https://signalbhn.org/fhir/StructureDefinition/documentreference",
  "name": "SignalDocumentReference",
  "title": "DocumentReference Profile",
  "status": "draft",
  "fhirVersion": "4.0.1",
  "kind": "resource",
  "abstract": false,
  "type": "DocumentReference",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/DocumentReference",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "DocumentReference.category",
        "path": "DocumentReference.category",
        "binding": {
          "strength": "required",
          "valueSet": "https://signalbhn.org/fhir/us/core/ValueSet/signal-filerepo-classification"
        }
      }
    ]
  }
}