*/
    protected boolean isHtml(final ResponseData responseData) {
        final String mimeType = responseData.getMimeType();
        if ("text/html".equals(mimeType) || "application/xhtml+xml".equals(mimeType)) {
            return true;
        }
        return false;
    }

    /**
     * Adds a rule for extracting child URLs from HTML tags.
     *