Syntax
=====

.. code-block:: text

    subdue = DEFI_MATER_GC (
        ◆/MAZARS = _F (
               ◆ CODIFICATION =/"ESSAI ",
                                /"BAEL91 ",
                                /"EC2 ",
               # If: equal_to (" CODIFICATION ", 'BAEL91')
                   ◆ UNITE_CONTRAINTE =/"MPa ",
                                        /"Pa",
                   ◆ FCJ = float,
               # If: equal_to (" CODIFICATION ", 'EC2')
                   ◆ UNITE_CONTRAINTE =/"MPa ",
                                        /"Pa",
                   ◆ CLASSE =/"C12/15",
                              /"C16/20",
                              /"C20/25",
                              /"C25/30",
                              /"C30/37",
                              /"C35/45",
                              /"C40/50",
                              /"C45/55",
                              /"C50/60",
                              /"C55/67",
                              /"C60/75",
                              /"C70/85",
                              /"C80/95",
                              /"C90/105",
               # If: equal_to (" CODIFICATION ", 'ESSAI')
                   # If: exists ('EPST0')
                       ◇ EPSC0 = float,
                   ◆ FCJ = float,
                   ◆ EIJ = float,
                   ◆ EPSI_C = float,
                   ◆ FTJ = float,
                   ◇ NU = float,
                   ◇/EPSD0 = float,
                     /EPST0 = float,
                   ◇ K = float,
                   ◇ AC = float,
                   ◇ BC = float,
                   ◇ AT = float,
                   ◇ BT = float,
                   ◇ SIGM_LIM = float,
                   ◇ EPSI_LIM = float,
            ),
          /ACIER = _F (
               ◆ E = float,
               ◆ SY = float,
               ◇ NU = float,
               ◇ D_ SIGM_EPSI = float,
               ◇ SIGM_LIM = float,
               ◇ EPSI_LIM = float,
            ),
          /ENDO_FISS_EXP = _F (
               ◆ E = float,
               ◆ NU = float,
               ◆ FT = float,
               ◆ FC = float,
               ◆ GF = float,
               ◆/P = float,
                 /G_ INIT = float,
               ◇/Q = float,
                 /Q_ REL = float,
               ◆ LARG_BANDE = float,
               ◇ REST_RIGI_FC = float (default: 0.9),
               ◇ COEF_RIGI_MINI = float,
            ),
          /ENDO_LOCA_EXP = _F (
               ◆ E = float,
               ◆ NU = float,
               ◆ FT = float,
               ◆ FC = float,
               ◆ GF = float,
               ◇ P = float,
               ◆ DIST_FISSURE = float,
               ◇ REST_RIGI_FC = float (default: 0.95),
            ),
          /ENDO_LOCA_TC = _F (
               ◆ E = float,
               ◆ NU = float,
               ◆ FT = float,
               ◆ FC = float,
               ◆ SIG0 = float,
               ◆ GF = float,
               ◆ P = float,
               ◆ DIST_FISSURE = float,
               ◇ REST_RIGI_FC = float (default: 0.99),
               ◇ COEF_REDU_SEUIL = float (default: 0.95),
               ◇ TAU_REGU_VISC = float,
            ),
          /BETON_GLRC = _F (
               ◆ CODIFICATION =/"ESSAI ",
                                /"EC2 ",
               # If: equal_to (" CODIFICATION ", 'EC2')
                   ◆ UNITE_CONTRAINTE =/"MPa ",
                                        /"Pa",
                   ◆ CLASSE =/"C12/15",
                              /"C16/20",
                              /"C20/25",
                              /"C25/30",
                              /"C30/37",
                              /"C35/45",
                              /"C40/50",
                              /"C45/55",
                              /"C50/60",
                              /"C55/67",
                              /"C60/75",
                              /"C70/85",
                              /"C80/95",
                              /"C90/105",
               # If: equal_to (" CODIFICATION ", 'ESSAI')
                   ◆ FCJ = float,
                   ◆ EIJ = float,
                   ◆ EPSI_C = float,
                   ◆ FTJ = float,
                   ◇ NU = float (default: 0.2),
            ),
        ◇ INFO =/1 (by default),
                 /2,
        ◇ RHO = float,
        ◇ ALPHA = float,
        ◇ AMOR_ALPHA = float,
        ◇ AMOR_BETA = float,
        ◇ AMOR_HYST = float,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices