Syntax
=====

.. code-block:: text

    cycl_mode = MODE_ITER_CYCL (
        ◆ BASE_MODALE = meca fashion,
        ◇ NB_MODE = int,
        ◆ NB_SECTEUR = int,
        ◆ LIAISON = _F (
             ◆ DROITE = text,
             ◆ GAUCHE = text,
             ◇ AXE = text,
          ),
        ◇ VERI_CYCL = _F (
             ◇ PRECISION = float (default: 0.001),
             ◇ CRITERE = "RELATIF ",
             ◇ DIST_REFE = float,
          ),
        ◆ CALCUL = _F (
             ◆/TOUT_DIAM = "OUI" (or not specified),
               /NB_DIAM = int,
             ◇ OPTION =/"PLUS_PETITE" (by default),
                        /"CENTRE ",
                        /"BANDE ",
             # If: equal_to (" OPTION ", 'CENTRE')
                 ◆ FREQ = float,
             # If: equal_to (" OPTION ", 'BANDE')
                 ◆ FREQ = float,
             ◇ NMAX_FREQ = int (default: 10),
             ◇ PREC_SEPARE = float (default: 100.0),
             ◇ PREC_AJUSTE = float (default: 1e-06),
             ◇ NMAX_ITER = int (default: 50),
          ),
        ◇ INFO =/1 (by default),
                 /2,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices