code: @Override
    protected ImmutableList<String> parseElements(String s) {
      ImmutableList.Builder<String> titles = ImmutableList.builder();
      Optional<XmlElement> child = XmlConverter.getChildOpt(s, "query", "allpages");
      if (child.isPresent()) {
        for (XmlElement pageElement : child.get().getChildren("p")) {
          String title = pageElement.getAttributeValue("title");
          log.debug("Found article title: \"{}\"", title);
          titles.add(title);
        }
      }
      return titles.build();
    }
docs: Picks the article name from a MediaWiki api response.
  
  @param s text for parsing
  @return a