Example with mandatory variables not filled in

---                                                                             
variable: example                                                               
family:                                                                         
  variable1: example                                                            
  subfamily:                                                                    
    variable: example                                                           
  variable2: example                                                            

Example with all modifiable variables

---                                                                             
variable: example                                                               
family:                                                                         
  variable1: example                                                            
  subfamily:                                                                    
    variable: example                                                           
  variable2: example