Interface Identifier

interface Identifier {
    id?: string;
    _id?: Element;
    assigner?: Reference<"Organization">;
    period?: Period;
    system?: string;
    _system?: Element;
    type?: CodeableConcept;
    use?: "temp" | "old" | "usual" | "official" | "secondary";
    _use?: Element;
    value?: string;
    _value?: Element;
}