code: public java.lang.String getSortingCode() {
      java.lang.Object ref = sortingCode_;
      if (ref instanceof java.lang.String) {
        return (java.lang.String) ref;
      } else {
        com.google.protobuf.ByteString bs = 
            (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        sortingCode_ = s;
        return s;
      }
    }
docs: <pre>
  Optional. Additional, country-specific, sorting code. This is not used
  in most regions. Where it is used, the value is either a string like
  "CEDEX", optionally followed by a number (e.g. "CEDEX 7"), or just a number
  alone, representing the "sector code" (Jamaica), "delivery area indicator"
  (Malawi) or "post office indicator" (e.g. Côte d'Ivoire).
  </pre>
  
  <code>string sorting_code = 5;</code>