2. Syntax

mesh = LIRE_MAILLAGE (
    ◇ FORMAT =/"ASTER ",
               /"GIBI ",
               /"GMSH ",
               /"IDEAS ",
               /"MED" (by default),
    VERI_MAIL = _F (
         ◇ VERIF =/"OUI" (by default),
                   /"NON ",
         ◇ APLAT = float (default: 0.001),
      ),
    # If: (not equal_to (" FORMAT ", 'MED'))
        ◇ UNITE = unit (default: 20),
    # If: (equal_to (" FORMAT ", 'MED'))
        ◇ UNITE = unit (default: 20),
        ◇ NOM_MED = text,
        ◇ INFO_MED =/0 (by default),
                     /1,
        ◇ PARTITIONNEUR =/"SANS" (by default),
                          /"PTSCOTCH ",
    # If: (equal_to (" FORMAT ", 'IDEAS'))
        ◇ CREA_GROUP_COUL =/"OUI ",
                            /"NON" (by default),
    ◇ INFO =/0,
             /1 (by default),
             /2,
)

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