<?xml version="1.0" encoding="UTF-8"?><SearchParameter xmlns="http://hl7.org/fhir"><id value="codesystem-extensions-CodeSystem-effective"/><url value="http://hl7.org/fhir/SearchParameter/codesystem-extensions-CodeSystem-effective"/><version value="5.0.0"/><name value="effective"/><status value="draft"/><experimental value="true"/><description value="Optional Extensions Element"/><code value="effective"/><base value="CodeSystem"/><type value="date"/><expression value="CodeSystem.extension('http://hl7.org/fhir/StructureDefinition/codesystem-effectiveDate'.value)"/><processingMode value="normal"/></SearchParameter>