Syntax
=====

.. code-block:: text

    crack_bottom = DEFI_FOND_FISS (
        ◆ MAILLAGE = mesh,
        ◇ INFO =/1 (by default),
                 /2,
        ◆ FOND_FISS = _F (
             ◇ TYPE_FOND =/"OUVERT" (by default),
                           /"FERME ",
             ◆/GROUP_NO = grno,
               /GROUP_MA = grma,
             # If: exists (" GROUP_MA ") and not equal_to (" TYPE_FOND ", 'FERME')
                 ◇ GROUP_NO_ORIG = big,
                 # If: exists (" GROUP_NO_ORIG ")
                     ◇ GROUP_NO_EXTR = big,
             # If: exists (" GROUP_MA ") and equal_to (" TYPE_FOND ", 'FERME')
                 ◇ GROUP_NO_ORIG = big,
                 # If: exists (" GROUP_NO_ORIG ")
                     ◇ GROUP_MA_ORIG = Grma,
          ),
        ◆ SYME =/"OUI ",
                 /"NON ",
        ◆ LEVRE_SUP = _F (
             ◆ GROUP_MA = GRMA,
          ),
        # If: exists (" LEVRE_SUP ") and equal_to (" SYME ", 'NON')
            ◆ LEVRE_INF = _F (
                 ◆ GROUP_MA = GRMA,
              ),
        ◇ CONFIG_INIT =/"COLLEE" (by default),
                        /"DECOLLEE ",
        # If: equal_to (" CONFIG_INIT ", 'DECOLLEE')
            ◆ NORMALE = float,
        ◇ PREC_NORM = float (default: 0.1),
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices