{

"resourceType": "SearchParameter",
"id": "codesystem-extensions-CodeSystem-effective",
"url": "http://hl7.org/fhir/SearchParameter/codesystem-extensions-CodeSystem-effective",
"version": "4.0.1",
"name": "effective",
"status": "draft",
"experimental": true,
"description": "Optional Extensions Element",
"code": "effective",
"base": [ "CodeSystem" ],
"type": "date",
"xpath": "f:CodeSystem/f:extension[@url='http://hl7.org/fhir/StructureDefinition/codesystem-effectiveDate'] | /f:#effectiveDate",
"xpathUsage": "normal"

}