{ "description": "Optional Extensions Element", "_filename": "SearchParameter-codesystem-extensions-CodeSystem-effective.json", "package_name": "rs/hl7.fhir.r5.core", "date": null, "expression": "CodeSystem.extension('http://hl7.org/fhir/StructureDefinition/codesystem-effectiveDate'.value)", "publisher": null, "name": "effective", "type": "date", "experimental": "true", "resourceType": "SearchParameter", "title": null, "package_version": "5.0.0-snapshot3", "status": "draft", "id": "3594682b-f9a5-4b1e-8f41-f478e7b90674", "kind": null, "processingMode": "normal", "url": "http://hl7.org/fhir/SearchParameter/codesystem-extensions-CodeSystem-effective", "code": "effective", "base": [ "CodeSystem" ], "version": "5.0.0" }