{

"resourceType": "SearchParameter",
"id": "questionnaireresponse-extensions-QuestionnaireResponse-item-subject",
"url": "http://hl7.org/fhir/SearchParameter/questionnaireresponse-extensions-QuestionnaireResponse-item-subject",
"version": "4.0.1",
"name": "item-subject",
"status": "draft",
"experimental": true,
"description": "Allows searching for QuestionnaireResponses by item value where the item has isSubject=true",
"code": "item-subject",
"base": [
  "QuestionnaireResponse"
],
"type": "reference",
"expression": "QuestionnaireResponse.item.where(hasExtension('http://hl7.org/fhir/StructureDefinition/questionnaireresponse-isSubject')).answer.value.ofType(Reference)",
"xpathUsage": "normal"

}