Syntax
=====

.. code-block:: text

    fiss_xfem = DEFI_FISS_XFEM (
        ◇ TYPE_DISCONTINUITE =/"FISSURE" (by default),
                               /"INTERFACE ",
                               /"COHESIF ",
        ◆ MAILLAGE = mesh,
        ◇/MAILLAGE_GRILLE = mesh,
          /FISS_GRILLE = fiss_xfem,
        # If: equal_to (" TYPE_DISCONTINUITE ", 'COHESIF')
            ◆ DEFI_FISS = _F (
                 ◇ FONC_LT = formula/function,
                 ◇ FONC_LN = formula/function,
                 ◆ GROUP_MA_BORD = GRMA,
                 ◇ FORM_FISS =/"ELLIPSE ",
                               /"RECTANGLE ",
                               /"CYLINDRE ",
                               /"DEMI_PLAN ",
                               /"SEGMENT ",
                               /"DEMI_DROITE ",
                               /"DROITE ",
                               /"ENTAILLE ",
                 # If: equal_to (" FORM_FISS ", 'ELLIPSE')
                     ◆ DEMI_GRAND_AXE = float,
                     ◆ DEMI_PETIT_AXE = float,
                     ◆ CENTRE = float,
                     ◆ VECT_X = float,
                     ◆ VECT_Y = float,
                     ◇ COTE_FISS =/"IN" (by default),
                                   /"OUT ",
                 # If: equal_to (" FORM_FISS ", 'RECTANGLE')
                     ◆ DEMI_GRAND_AXE = float,
                     ◆ DEMI_PETIT_AXE = float,
                     ◇ RAYON_CONGE = float,
                     ◆ CENTRE = float,
                     ◆ VECT_X = float,
                     ◆ VECT_Y = float,
                     ◇ COTE_FISS =/"IN" (by default),
                                   /"OUT ",
                 # If: equal_to (" FORM_FISS ", 'ENTAILLE')
                     ◆ DEMI_LONGUEUR = float,
                     ◆ RAYON_CONGE = float,
                     ◆ CENTRE = float,
                     ◆ VECT_X = float,
                     ◆ VECT_Y = float,
                 # If: equal_to (" FORM_FISS ", 'CYLINDRE')
                     ◆ DEMI_GRAND_AXE = float,
                     ◆ DEMI_PETIT_AXE = float,
                     ◆ CENTRE = float,
                     ◆ VECT_X = float,
                     ◆ VECT_Y = float,
                 # If: equal_to (" FORM_FISS ", 'DEMI_PLAN')
                     ◆ PFON = float,
                     ◆ NORMALE = float,
                     ◆ DTAN = float,
                 # If: equal_to (" FORM_FISS ", 'SEGMENT')
                     ◆ PFON_ORIG = float,
                     ◆ PFON_EXTR = float,
                 # If: equal_to (" FORM_FISS ", 'DEMI_DROITE')
                     ◆ PFON = float,
                     ◆ DTAN = float,
                 # If: equal_to (" FORM_FISS ", 'DROITE')
                     ◆ POINT = float,
                     ◆ DTAN = float,
              ),
        # If: not equal_to (" TYPE_DISCONTINUITE ", 'COHESIF')
            ◆ DEFI_FISS = _F (
                 ◇ FONC_LT = formula/function,
                 ◇ FONC_LN = formula/function,
                 ◇ CHAM_NO_LSN = cham_no,
                 ◇ CHAM_NO_LST = cham_no,
                 ◇ GROUP_MA_FISS = Grma,
                 ◇ GROUP_MA_FOND = Grma,
                 ◇ FORM_FISS =/"ELLIPSE ",
                               /"RECTANGLE ",
                               /"CYLINDRE ",
                               /"DEMI_PLAN ",
                               /"SEGMENT ",
                               /"DEMI_DROITE ",
                               /"DROITE ",
                               /"ENTAILLE ",
                 # If: equal_to (" FORM_FISS ", 'ELLIPSE')
                     ◆ DEMI_GRAND_AXE = float,
                     ◆ DEMI_PETIT_AXE = float,
                     ◆ CENTRE = float,
                     ◆ VECT_X = float,
                     ◆ VECT_Y = float,
                     ◇ COTE_FISS =/"IN" (by default),
                                   /"OUT ",
                 # If: equal_to (" FORM_FISS ", 'RECTANGLE')
                     ◆ DEMI_GRAND_AXE = float,
                     ◆ DEMI_PETIT_AXE = float,
                     ◇ RAYON_CONGE = float,
                     ◆ CENTRE = float,
                     ◆ VECT_X = float,
                     ◆ VECT_Y = float,
                     ◇ COTE_FISS =/"IN" (by default),
                                   /"OUT ",
                 # If: equal_to (" FORM_FISS ", 'ENTAILLE')
                     ◆ DEMI_LONGUEUR = float,
                     ◆ RAYON_CONGE = float,
                     ◆ CENTRE = float,
                     ◆ VECT_X = float,
                     ◆ VECT_Y = float,
                 # If: equal_to (" FORM_FISS ", 'CYLINDRE')
                     ◆ DEMI_GRAND_AXE = float,
                     ◆ DEMI_PETIT_AXE = float,
                     ◆ CENTRE = float,
                     ◆ VECT_X = float,
                     ◆ VECT_Y = float,
                 # If: equal_to (" FORM_FISS ", 'DEMI_PLAN')
                     ◆ PFON = float,
                     ◆ NORMALE = float,
                     ◆ DTAN = float,
                 # If: equal_to (" FORM_FISS ", 'SEGMENT')
                     ◆ PFON_ORIG = float,
                     ◆ PFON_EXTR = float,
                 # If: equal_to (" FORM_FISS ", 'DEMI_DROITE')
                     ◆ PFON = float,
                     ◆ DTAN = float,
                 # If: equal_to (" FORM_FISS ", 'DROITE')
                     ◆ POINT = float,
                     ◆ DTAN = float,
              ),
        ◇ GROUP_MA_ENRI = Grma,
        # If: equal_to (" TYPE_DISCONTINUITE ", 'INTERFACE')
            ◇ CHAM_DISCONTINUITE =/"DEPL" (by default),
                                   /"SIGM ",
        # If: equal_to (" TYPE_DISCONTINUITE ", 'FISSURE')
            ◇ CHAM_DISCONTINUITE = "DEPL ",
            ◇ TYPE_ENRI_FOND =/"TOPOLOGIQUE ",
                               /"GEOMETRIQUE" (by default),
            # If: equal_to (" TYPE_ENRI_FOND ", 'GEOMETRIQUE')
                ◇ RAYON_ENRI = float,
                # If: (not exists (" RAYON_ENRI "))
                    ◇ NB_COUCHES = int (default: 2),
        # If: (not exists (" MAILLAGE_GRILLE ")) and (not exists (" FISS_GRILLE "))
            ◇ JONCTION = _F (
                 ◆ FISSURE = fiss_xfem,
                 ◆ POINT = float,
              ),
        ◇ INFO =/1 (by default),
                 /2,
                 /3,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices