*/
    public List<SitemapImage> getImages() {
        if (images == null) {
            images = new ArrayList<>();
        }
        return images;
    }

    /**
     * Adds an image to this sitemap URL.
     * @param image the image to add
     */
    public void addImage(final SitemapImage image) {
        getImages().add(image);
    }

    /**

        final SitemapUrl sitemapUrl = (SitemapUrl) sitemaps[0];
        assertEquals("http://www.example.com/sample.html", sitemapUrl.getLoc());
        assertEquals(1, sitemapUrl.getImages().size());

        final SitemapImage image = sitemapUrl.getImages().get(0);
        assertEquals("http://www.example.com/image.jpg", image.getLoc());
        assertEquals("Sample image caption", image.getCaption());

     * @param writer the writer to append extracted text to
     */
    protected void extractAnnotations(final PDDocument doc, final StringWriter writer) {
        for (final PDPage page : doc.getPages()) {
            try {
                for (final PDAnnotation annotation : page.getAnnotations()) {
                    if (annotation instanceof final PDAnnotationFileAttachment annotationFileAttachment) {