{"base":["CodeSystem"],"code":"effective","description":"Optional Extensions Element","experimental":true,"expression":"CodeSystem.extension('http://hl7.org/fhir/StructureDefinition/codesystem-effectiveDate'.value)","id":"codesystem-extensions-CodeSystem-effective","name":"effective","processingMode":"normal","resourceType":"SearchParameter","status":"draft","type":"date","url":"http://hl7.org/fhir/SearchParameter/codesystem-extensions-CodeSystem-effective","version":"5.0.0"}