this.postalAddress = value;
    }

    public String getPostalCode() {
        checkSpecifiedProperty("postalCode");
        return convertEmptyToNull(postalCode);
    }

    public void setPostalCode(String value) {
        registerModifiedProperty("postalCode");
        this.postalCode = value;
    }

    public String getPreferredLanguage() {
        checkSpecifiedProperty("preferredLanguage");

                "postalAddress");
        setupEpg(_epgMap, et -> ((User) et).getPostalCode(), (et, vl) -> ((User) et).setPostalCode(DfTypeUtil.toString(vl)), "postalCode");
        setupEpg(_epgMap, et -> ((User) et).getPreferredLanguage(), (et, vl) -> ((User) et).setPreferredLanguage(DfTypeUtil.toString(vl)),
                "preferredLanguage");

            result.setPostOfficeBox(DfTypeUtil.toString(source.get("postOfficeBox")));
            result.setPostalAddress(DfTypeUtil.toString(source.get("postalAddress")));
            result.setPostalCode(DfTypeUtil.toString(source.get("postalCode")));
            result.setPreferredLanguage(DfTypeUtil.toString(source.get("preferredLanguage")));

    }

    @Test
    public void test_user_postalCode() {
        final User user = new User();
        assertNull(user.getPostalCode());

        user.setPostalCode("12345");
        assertEquals("12345", user.getPostalCode());
    }

    @Test
    public void test_user_carLicense() {
        final User user = new User();
        assertNull(user.getCarLicense());