Syntax
=====

.. code-block:: text

    /matr_elem_pres_c
    /matr_elem_depl_r
    /Matr_Elem_Temp_r
    /matr_elem_depl_c = CALC_MATR_ELEM (
        ◆ OPTION =/"RIGI_MECA ",
                   /"MASS_MECA ",
                   /"RIGI_GEOM ",
                   /"MASS_THER ",
                   /"AMOR_MECA ",
                   /"RIGI_THER ",
                   /"IMPE_MECA ",
                   /"ONDE_FLUI ",
                   /"MASS_FLUI_STRU ",
                   /"RIGI_FLUI_STRU ",
                   /"RIGI_ROTA ",
                   /"MECA_GYRO ",
                   /"RIGI_GYRO ",
                   /"MASS_MECA_DIAG ",
                   /"RIGI_ACOU ",
                   /"MASS_ACOU ",
                   /"AMOR_ACOU ",
                   /"RIGI_MECA_HYST ",
        ◆ MODELE = model,
        ◇ INST = float,
        # If: equal_to (" OPTION ", 'RIGI_MECA')
            ◇ GROUP_MA = Grma,
            ◇ CHAM_MATER = mater_field,
            ◇ CARA_ELEM = cara_elem,
            ◇ MODE_FOURIER = int,
            ◇ CHARGE = char_meca,
            ◇ CALC_ELEM_MODELE =/"OUI" (by default),
                                 /"NON ",
        # If: (equal_to (" OPTION ", '",' MASS_MECA ')) or (equal_to (" OPTION ",' MASS_MECA_DIAG '))
            ◇ GROUP_MA = Grma,
            ◇ CHAM_MATER = mater_field,
            ◇ CARA_ELEM = cara_elem,
            ◇ CHARGE = char_meca,
        # If: equal_to (" OPTION ", 'RIGI_GEOM')
            ◇ GROUP_MA = Grma,
            ◆ SIEF_ELGA = cham_elem,
            ◇ CARA_ELEM = cara_elem,
            ◇ STRX_ELGA = cham_elem,
            ◇ DEPL = cham_no,
            ◇ CHAM_MATER = mater_field,
            ◇ MODE_FOURIER = int,
        # If: equal_to (" OPTION ", 'RIGI_ROTA')
            ◆ CHAM_MATER = cham_master,
            ◇ CARA_ELEM = cara_elem,
            ◆ CHARGE = char_meca,
        # If: equal_to (" OPTION ", 'MECA_GYRO')
            ◆ CHAM_MATER = cham_master,
            ◇ CARA_ELEM = cara_elem,
            ◇ CHARGE = char_meca,
            ◇ GROUP_MA = Grma,
        # If: equal_to (" OPTION ", 'RIGI_GYRO')
            ◆ CHAM_MATER = cham_master,
            ◇ CARA_ELEM = cara_elem,
            ◇ CHARGE = char_meca,
            ◇ GROUP_MA = Grma,
        # If: equal_to (" OPTION ", 'AMOR_MECA')
            ◇ GROUP_MA = Grma,
            ◇ CARA_ELEM = cara_elem,
            ◇ CHAM_MATER = mater_field,
            ◇ RIGI_MECA = matr_elem_depl_r,
            ◇ MASS_MECA = matr_elem_depl_r,
            ◇ CHARGE = char_meca,
            ◇ AMOR_FLUI =/"OUI" (by default),
                          /"NON ",
            ◇ VNOR =/1.0 (by default),
                     /-1.0,
            ◇ TYPE_AMOR =/"TOUT" (by default),
                          /"ABSO ",
            # If: equal_to (" TYPE_AMOR ", ('TOUT'))
            # If: equal_to (" TYPE_AMOR ", 'ABSO')
        # If: equal_to (" OPTION ", 'RIGI_MECA_HYST')
            ◇ GROUP_MA = Grma,
            ◇ CHARGE = char_meca,
            ◇ CHAM_MATER = mater_field,
            ◇ CARA_ELEM = cara_elem,
            ◆ RIGI_MECA = matr_elem_depl_r,
        # If: equal_to (" OPTION ", 'RIGI_THER')
            ◆ CHAM_MATER = cham_master,
            ◇ CARA_ELEM = cara_elem,
            ◇ MODE_FOURIER = int,
            ◇ CHARGE = char_ther,
        # If: equal_to (" OPTION ", 'MASS_THER')
            ◆ CHAM_MATER = cham_master,
            ◇ CARA_ELEM = cara_elem,
        # If: equal_to (" OPTION ", 'RIGI_ACOU')
            ◆ CHAM_MATER = cham_master,
            ◇ CHARGE = char_acou,
        # If: (equal_to (" OPTION ", '",' MASS_ACOU ')) or (equal_to (" OPTION ",' AMOR_ACOU '))
            ◆ CHAM_MATER = cham_master,
            ◇ CHARGE = char_acou,
            # If: (equal_to (" OPTION ", 'AMOR_ACOU'))
                ◇ VNOR =/1.0 (by default),
                         /-1.0,
        # If: equal_to (" OPTION ", 'RIGI_FLUI_STRU')
            ◆ CARA_ELEM = cara_elem,
            ◆ CHAM_MATER = cham_master,
            ◆ CHARGE = char_meca,
        # If: equal_to (" OPTION ", 'MASS_FLUI_STRU')
            ◇ GROUP_MA = Grma,
            ◆ CARA_ELEM = cara_elem,
            ◆ CHAM_MATER = cham_master,
            ◆ CHARGE = char_meca,
        # If: (equal_to (" OPTION ", '",' IMPE_MECA ')) or (equal_to (" OPTION ",' ONDE_FLUI '))
            ◆ CHAM_MATER = cham_master,
            ◇ GROUP_MA = Grma,
            ◇ CHARGE = char_meca,
            # If: (equal_to (" OPTION ", 'IMPE_MECA'))
                ◇ VNOR =/1.0 (by default),
                         /-1.0,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices