docs: @Override
      public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
          XmlStringBuilder buf = new XmlStringBuilder(this);
          buf.optAttribute("label", getLabel());
          buf.rightAngleBracket();
  
          walkList(buf, getPageLayout());
  
          buf.closeElement(this);
  
          return buf;
      }