code: private void addAppendNodelets() {
          parser.setXpath("/aspectran/append");
          parser.addNodelet(attrs -> {
              String file = attrs.get("file");
              String resource = attrs.get("resource");
              String url = attrs.get("url");
              String format = attrs.get("format");
              String profile = attrs.get("profile");
  
              RuleAppendHandler appendHandler = assistant.getRuleAppendHandler();
              if (appendHandler != null) {
                  AppendRule appendRule = AppendRule.newInstance(file, resource, url, format, profile);
                  appendHandler.pending(appendRule);
              }
          });
      }
docs: Adds the append nodelets.