{
  "description": "Optional Extensions Element",
  "_filename": "SearchParameter-codesystem-extensions-CodeSystem-effective.json",
  "package_name": "hl7.fhir.r3.core",
  "date": null,
  "publisher": null,
  "name": "effective",
  "xpath": "f:CodeSystem/f:extension[@url='http://hl7.org/fhir/StructureDefinition/codesystem-effectiveDate'] | /f:#effectiveDate",
  "xpathUsage": "normal",
  "type": "date",
  "experimental": "true",
  "resourceType": "SearchParameter",
  "title": null,
  "package_version": "3.0.2",
  "status": "draft",
  "id": "c0594e0e-7b58-48f0-a591-9a9915cd569c",
  "kind": null,
  "url": "http://hl7.org/fhir/SearchParameter/codesystem-extensions-CodeSystem-effective",
  "code": "effective",
  "version": null
}