{
  "description": "Optional Extensions Element",
  "_filename": "SearchParameter-codesystem-extensions-CodeSystem-effective.json",
  "package_name": "hl7.fhir.r4b.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": "4.1.0",
  "status": "draft",
  "id": "bf7b2ba4-58d5-404e-a5f7-e1a2b39a8d60",
  "kind": null,
  "url": "http://hl7.org/fhir/SearchParameter/codesystem-extensions-CodeSystem-effective",
  "code": "effective",
  "version": "4.1.0"
}