code: @Override
    public String processAllReturningText(String xml) {
      Optional<XmlElement> child = //
          XmlConverter.getChildOpt(xml, "query", "pages", "page", "imageinfo", "ii");
      if (child.isPresent()) {
        urlOfImage = child.get().getAttributeValueOpt("url").or("");
      }
      return "";
    }
docs: {@inheritDoc}