* @param url the base URL for resolving relative URLs
     * @param attrValue the attribute value containing the URL
     * @param encoding the character encoding
     */
    @Override
    protected void addChildUrlFromTagAttribute(final List<String> urlList, final URL url, final String attrValue, final String encoding) {
        final String urlValue = attrValue.trim();
        URL childUrl;
        String u = null;

            if (attr == null) {
                continue;
            }

            for (int i = 0; i < attr.size(); i++) {
                final Object attrValue = attr.get(i);
                if (attrValue != null) {
                    final String entryDn = attrValue.toString();

                    if (logger.isDebugEnabled()) {
                        logger.debug("entryDn: {}", entryDn);
                    }