2. Syntax

subdue = INCLUDE_MATERIAU (
    ◆/NOM_AFNOR = text,
      /FICHIER = text,
    ◇ & TYPE_MODELE =/"REF ",
                      /"PAR ",
      & VARIANTE =/"A",
                   /"B",
                   /"C",
                   /"D",
                   /"E",
                   /"F",
                   /"G",
                   /"H",
                   /"I",
                   /"J",
                   /"K",
                   /"L",
                   /"M",
                   /"N",
                   /"O",
                   /"P",
                   /"Q",
                   /"R",
                   /"S",
                   /"T",
                   /"U",
                   /"V",
                   /"W",
                   /"X",
                   /"Y",
                   /"Z",
      & TYPE_VALE =/"NOMI ",
                    /"MINI ",
                    /"MAXI ",
    ◇ EXTRACTION = _F (
         ◆ COMPOR = text,
         ◆ TEMP_EVAL = float,
      ),
    ◇ UNITE_LONGUEUR =/"M" (by default),
                       /"MM",
    ◇ PROL_DROITE =/"CONSTANT ",
                    /"LINEAIRE ",
                    /"EXCLU" (by default),
    ◇ PROL_GAUCHE =/"CONSTANT ",
                    /"LINEAIRE ",
                    /"EXCLU" (by default),
    ◇ INFO =/1 (by default),
             /2,
)

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