Example with mandatory variables not filled in

---                                                                             
var1: example                                                                   
family:                                                                         
  var2: string6                                                                 

Example with all variables modifiable

---                                                                             
var1: example                                                                   
family:                                                                         
  var2: string6                                                                 
  subfamily:                                                                    
    variable:                                                                   
      - null                                                                    
      - null                                                                    
family2:                                                                        
  var2: example                                                                 
  var3: string5                                                                 
  subfamily:                                                                    
    variable:                                                                   
      - null                                                                    
      - null                                                                    
      - string4