{
  "resourceType": "SearchParameter",
  "id": "AllergyIntolerance-onset",
  "url": "http://hl7.org/fhir/SearchParameter/AllergyIntolerance-onset",
  "name": "onset",
  "status": "draft",
  "experimental": false,
  "publisher": "Health Level Seven International (Patient Care)",
  "contact": [
    {
      "telecom": [
        {
          "system": "url",
          "value": "http://hl7.org/fhir"
        }
      ]
    },
    {
      "telecom": [
        {
          "system": "url",
          "value": "http://www.hl7.org/Special/committees/patientcare/index.cfm"
        }
      ]
    }
  ],
  "code": "onset",
  "base": [
    "AllergyIntolerance"
  ],
  "type": "date",
  "description": "Date(/time) when manifestations showed",
  "expression": "AllergyIntolerance.reaction.onset",
  "xpath": "f:AllergyIntolerance/f:reaction/f:onset",
  "xpathUsage": "normal"
}