}

    public String getPreferredLanguage() {
        checkSpecifiedProperty("preferredLanguage");
        return convertEmptyToNull(preferredLanguage);
    }

    public void setPreferredLanguage(String value) {
        registerModifiedProperty("preferredLanguage");
        this.preferredLanguage = value;
    }

    public String getRegisteredAddress() {

        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");
        setupEpg(_epgMap, et -> ((User) et).getRegisteredAddress(), (et, vl) -> ((User) et).setRegisteredAddress(DfTypeUtil.toString(vl)),

            result.setPostalAddress(DfTypeUtil.toString(source.get("postalAddress")));
            result.setPostalCode(DfTypeUtil.toString(source.get("postalCode")));
            result.setPreferredLanguage(DfTypeUtil.toString(source.get("preferredLanguage")));
            result.setRegisteredAddress(DfTypeUtil.toString(source.get("registeredAddress")));
            result.setRoles(toStringArray(source.get("roles")));

    }

    @Test
    public void test_user_preferredLanguage() {
        final User user = new User();
        assertNull(user.getPreferredLanguage());

        user.setPreferredLanguage("en");
        assertEquals("en", user.getPreferredLanguage());
    }

    @Test
    public void test_user_destinationIndicator() {
        final User user = new User();