Syntaxe
=======

.. code-block:: text

    mater = DEFI_MATER_GC(
        ◆ / MAZARS = _F(
               ◆ CODIFICATION = / "ESSAI",
                                / "BAEL91",
                                / "EC2",
               # Si: equal_to("CODIFICATION", 'BAEL91')
                   ◆ UNITE_CONTRAINTE = / "MPa",
                                        / "Pa",
                   ◆ FCJ = float,
               # Si: 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",
               # Si: equal_to("CODIFICATION", 'ESSAI')
                   # Si: 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 (défaut: 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 (défaut: 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 (défaut: 0.99),
               ◇ COEF_REDU_SEUIL = float (défaut: 0.95),
               ◇ TAU_REGU_VISC = float,
            ),
          / BETON_GLRC = _F(
               ◆ CODIFICATION = / "ESSAI",
                                / "EC2",
               # Si: 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",
               # Si: equal_to("CODIFICATION", 'ESSAI')
                   ◆ FCJ = float,
                   ◆ EIJ = float,
                   ◆ EPSI_C = float,
                   ◆ FTJ = float,
                   ◇ NU = float (défaut: 0.2),
            ),
        ◇ INFO = / 1 (par défaut),
                 / 2,
        ◇ RHO = float,
        ◇ ALPHA = float,
        ◇ AMOR_ALPHA = float,
        ◇ AMOR_BETA = float,
        ◇ AMOR_HYST = float,
    )
    
    ◆ : obligatoire
    ◇ : optionnel
    ⟐ : présent par défaut
    & : ensemble
    / : un seul parmi
    | : plusieurs choix possibles