使用AbderaClient检索超过19个结果？ （我想是分页问题）

Question

浏览器中的手动查询给出了1305个结果： http://www.gahetna.nl/beeldbank-api/opensearch/?q=Leiden

但是我的代码与Abdera（下面）只返回19个结果。这必须归功于分页。如何访问所有结果页面？ THX！

        List<NationaalArchiefDoc> docs = new ArrayList();
        Abdera abdera = new Abdera();
        AbderaClient client = new AbderaClient(abdera);
        searchString = searchString.replaceAll(" ", "+");

        ClientResponse resp = client.get("http://www.gahetna.nl/beeldbank-api/opensearch/?q=" + searchString.trim());

        if (resp.getType() == ResponseType.SUCCESS) {
            Document docAbdera = resp.getDocument();
            Element elementAbdera = docAbdera.getRoot();

            Iterator<Element> elementIterator = elementAbdera.getElements().get(0).getElements().iterator();
            System.out.println("number of docs found: " + elementAbdera.getElements().get(0).getElements().size());

            //looping through the 19 items
            while (elementIterator.hasNext()) {
                NationaalArchiefDoc doc = new NationaalArchiefDoc();
                Element element1 = elementIterator.next();
                // more actions in the loop...
            }
        }