Syntax
=====

.. code-block:: text

    skeleton = DEFI_SQUELETTE (
        ◆/CYCLIQUE = _F (
               ◆/MODE_CYCL = mode_cycle,
                 /MAILLAGE = mesh,
               ◇ & NB_SECTEUR = int,
            ),
          /MODELE_GENE = gene_model,
          /MAILLAGE = mesh,
        ◇/SECTEUR = _F (
               ◇ GROUP_MA = Grma,
               ◇ TOUT = "OUI" (or not specified),
            ),
        ◇ SQUELETTE = skeleton,
        ◇ RECO_GLOBAL = _F (
             ◇/TOUT = "OUI" (or not specified),
               /GROUP_NO_1 = grno,
             ◇ & SOUS_STRUC_1 = text,
             ◇ & SOUS_STRUC_2 = text,
             ◇ & GROUP_NO_2 = grno,
             ◇ PRECISION = float (default: 0.001),
             ◇ CRITERE =/"RELATIF" (by default),
                         /"ABSOLU ",
             ◇ DIST_REFE = float,
          ),
        ◇ & NOM_GROUP_MA = _F (
               ◆ NOM = text,
               ◆ SOUS_STRUC = text,
               ◆ GROUP_MA = GRMA,
            ),
          /SOUS_STRUC = _F (
               ◆ NOM = text,
               ◆/GROUP_MA = grma,
                 /TOUT = "OUI" (or not specified),
            ),
        ◇ EXCLUSIF =/"OUI ",
                     /"NON" (by default),
        ◇ GROUP_MA = Grma,
        ◇ TOUT = "OUI" (or not specified),
        ◇ TRANS = float,
        ◇ ANGL_NAUT = float,
        ◇ TITRE = text,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices