code: def netconf_config_change_changed_by_server_or_user_by_user_username(self, **kwargs):
          
          config = ET.Element("config")
          netconf_config_change = ET.SubElement(config, "netconf-config-change", xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-notifications")
          changed_by = ET.SubElement(netconf_config_change, "changed-by")
          server_or_user = ET.SubElement(changed_by, "server-or-user")
          by_user = ET.SubElement(server_or_user, "by-user")
          username = ET.SubElement(by_user, "username")
          username.text = kwargs.pop('username')
  
          callback = kwargs.pop('callback', self._callback)
          return callback(config)
docs: Auto Generated Code