final YamlFrontMatterVisitor visitor = new YamlFrontMatterVisitor();
        document.accept(visitor);

        final Map<String, List<String>> frontMatter = visitor.getData();
        for (final Map.Entry<String, List<String>> entry : frontMatter.entrySet()) {
            final String key = "frontmatter." + entry.getKey();
            final List<String> values = entry.getValue();

    }

    /**
     * Returns the value at the specified index.
     *
     * @param index
     *            the index
     * @return the value at the specified index
     */
    public V getAt(final int index) {
        return getEntryAt(index).getValue();
    }

    /**
     * Returns the key at the specified index.
     *
     * @param index
     *            the index

                responseData.addMetaData(FILE_ATTRIBUTE_VIEW, aclFileAttributeView);
                responseData.addMetaData(FS_FILE_GROUPS,
                        aclFileAttributeView.getAcl().stream().map(acl -> acl.principal().getName()).toArray(n -> new String[n]));
                return aclFileAttributeView;
            }

     */
    public static Map<String, Object> getDataMap(final AccessResultData<?> accessResultData) {
        // create input source
        final InputSource is = new InputSource(new ByteArrayInputStream(accessResultData.getData()));
        if (StringUtil.isNotBlank(accessResultData.getEncoding())) {
            is.setEncoding(accessResultData.getEncoding());
        }

        // create handler

            return abbreviateSite("\\\\" + value.replace('/', '\\'));
        }

        return getSite(url, encoding);
    }

    @Override
    public Object getData(final AccessResultData<?> accessResultData) {
        final byte[] data = accessResultData.getData();
        if (data != null) {
            try {
                return dataSerializer.fromBinaryToObject(data);
            } catch (final Exception e) {

                    if (dfos.isInMemory()) {
                        responseData.setResponseBody(dfos.getData());
                        contentLength = dfos.getData().length;
                        if (contentType == null) {
                            try (InputStream is = new ByteArrayInputStream(dfos.getData())) {
                                contentType = mimeTypeHelper.getContentType(is, url);

                final Map<String, Object> responseDataMap = (Map<String, Object>) rawData;
                return responseDataMap;
            } else {
                final byte[] data = resultData.getData();
                if (data != null) {
                    try {
                        final DataSerializer dataSerializer = ComponentUtil.getComponent("dataSerializer");

                logger.fine(() -> "Response in " + (dfos.isInMemory() ? "Memory" : "File"));
                if (dfos.isInMemory()) {
                    contentCache = new ContentCache(dfos.getData());
                } else {
                    contentCache = new ContentCache(dfos.getFile());
                }
                response.setContentCache(contentCache);
            } catch (final Exception e) {

        }

        propertyMap.put(key, value);
    }

    /**
     * Returns data as HTML content of String.
     *
     */
    @Override
    public Object getData(final AccessResultData<?> accessResultData) {
        // check transformer name
        if (!getName().equals(accessResultData.getTransformerName())) {
            throw new CrawlerSystemException(

     * @param accessResultData the access result data containing serialized data
     * @return the deserialized object
     */
    @Override
    public Object getData(final AccessResultData<?> accessResultData) {
        final byte[] data = accessResultData.getData();
        if (data != null) {
            try {
                return dataSerializer.fromBinaryToObject(data);
            } catch (final Exception e) {