[selected_node] | element/part | 
+-root | element/part | 
| +-0 | element/part | 
| | +-0 | text/plain | exit_application
| | +-1 | text/plain | inline
| | +-2 | text/plain | live/exit
| | +-3 | text/plain | 
| | +-4 | element/part | 