docs: private String findAtomLink(final Element parent, final String rel) {
          String ret = null;
          final List<Element> linksList = parent.getChildren("link", ATOM_10_NS);
          if (linksList != null) {
              for (final Element element : linksList) {
                  final Element link = element;
                  final Attribute relAtt = getAttribute(link, "rel");
                  final Attribute hrefAtt = getAttribute(link, "href");
                  if (relAtt == null && "alternate".equals(rel) || relAtt != null && relAtt.getValue().equals(rel)) {
                      ret = hrefAtt.getValue();
                      break;
                  }
              }
          }
          return ret;
      }