*
     * @param spf
     *            {@link SAXParserFactory}. Must not be {@literal null}.
     * @param state
     *            <code>true</code> to enable XInclude.
     * @return <code>true</code> if the XInclude state was successfully set.
     */
    public static boolean setXIncludeAware(final SAXParserFactory spf, final boolean state) {
        assertArgumentNotNull("spf", spf);

        try {