(Program
  (Call
    (Identifier)
    { +(TextElement)+ }
    { -(TextElement)- }
    { -(Identifier)-  }
    (Empty))
  (Call
    (Identifier)
    (TextElement)
    { +(Null)+ }
    { -(Identifier)- }
    { -(Identifier)- }
    (Empty))
{ +(Call
    (Identifier)
    (TextElement)
    (Identifier)
    (Identifier)
    (Empty))+ }
{ -(Call(Identifier)(TextElement)(Empty))- })