Syntax
=====

.. code-block:: text

    /Cham_elem
    /table = CALC_GP (
        ◆ RESULTAT = result,
        ◆ LIST_INST = listr8,
        ◇ PRECISION = float (default: 1e-06),
        ◇ CRITERE =/"RELATIF ",
                    /"ABSOLU" (by default),
        ◆/TRANCHE_2D = _F (
               ◆ ZONE_MAIL =/"NON ",
                             /"OUI ",
               # If: equal_to (" ZONE_MAIL ", 'OUI')
                   ◆ GROUP_MA = Grma,
                   ◆ TAILLE = listr8,
               # If: equal_to (" ZONE_MAIL ", 'NON')
                   ◆ CENTRE = float,
                   ◆ RAYON = float,
                   ◆ ANGLE = float,
                   ◆ TAILLE = float,
                   ◆ NB_ZONE = int,
                   ◇ CHAMP_VISU = co,
            ),
          /TRANCHE_3D = _F (
               ◆ GROUP_MA = Grma,
            ),
        # If: exists (" TRANCHE_2D ")
            ◆ SYME =/"NON ",
                     /"OUI ",
        # If: exists (" TRANCHE_3D ")
            ◆ FOND_FISS = bottom_crack,
        ◇ GPMAX = co,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices