2. Syntax

subdue = DEFI_COMPOSITE (
    ◆ COUCHE = _F (
         ◆ EPAIS = float,
         ◆ MATER = subdue,
         ◇ ORIENTATION = float,
      ),
    ◇ IMPRESSION = _F (
         ◇ UNITE = unit (default: 8),
      ),
)

◆: mandatory
◇: optional
: present by default
&: together
/: only one among
|: several possible choices