Syntax
=====

.. code-block:: text

    cham_elem = POST_ROCHE (
        ◆ ZONE_ANALYSE = _F (
             ◆/TOUT = "OUI" (or not specified),
               /GROUP_MA = grma,
             ◆ GROUP_NO_ORIG = big,
          ),
        ◇ COUDE = _F (
             ◇ GROUP_MA = Grma,
             ◆ ANGLE = float,
             ◆ RCOURB = float,
          ),
        ◇ MODELE = model,
        ◇ CARA_ELEM = cara_elem,
        ◇ CHAM_MATER = mater_field,
        ◇ INST_TEMP = float,
        ◆/RESU_MECA = _F (
               ◆ TYPE_CHAR =/"SISM_INER_SPEC ",
                             /"DEPLACEMENT ",
                             /"DILAT_THERM ",
                             /"POIDS ",
               # If: equal_to (" TYPE_CHAR ", 'SISM_INER_SPEC')
                   ◆ RESULTAT = mode_meca/mult_elas,
                   ◇ DIRECTION =/"COMBI" (by default),
                                 /"X",
                                 /"Y",
                                 /"Z",
                   ◇ TYPE_RESU =/"DYN_QS" (by default),
                                 /"DYN ",
                                 /"AS",
               # If: not equal_to (" TYPE_CHAR ", 'SISM_INER_SPEC')
                   ◆/CHAM_GD = cham_elem,
                     /RESULTAT = evol_elas,
                   ◆/NUME_ORDRE = int,
                     /INST = float,
                   # If: exists (" INST ")
                       ◇ CRITERE =/"RELATIF" (by default),
                                   /"ABSOLU ",
                       ◇ PRECISION = float (default: 1e-06),
            ),
          /RESU_MECA_TRAN = _F (
               ◆ TYPE_CHAR =/"SISM_INER_TRAN ",
                             /"DEPLACEMENT ",
                             /"DILAT_THERM ",
                             /"POIDS ",
               # If: equal_to (" TYPE_CHAR ", 'SISM_INER_TRAN')
                   ◆ RESULTAT = dyna_trans,
                   ◇ RESU_CORR = dyna_trans,
                   ◆/TOUT_ORDRE = "OUI" (or not specified),
                     /NUME_ORDRE = int,
                     /INST = float,
                     /LIST_ORDRE = listis,
                     /LIST_INST = listr8,
                   # If: exists (" INST ") or exists (" LIST_INST ")
                       ◇ CRITERE =/"RELATIF" (by default),
                                   /"ABSOLU ",
                       ◇ PRECISION = float (default: 1e-06),
               # If: not equal_to (" TYPE_CHAR ", 'SISM_INER_TRAN')
                   ◆/CHAM_GD = cham_elem,
                     /RESULTAT = evol_elas,
                   ◆/NUME_ORDRE = int,
                     /INST = float,
                   # If: exists (" INST ")
                       ◇ CRITERE =/"RELATIF" (by default),
                                   /"ABSOLU ",
                       ◇ PRECISION = float (default: 1e-06),
            ),
        ◇ PRESSION = _F (
             ◆/TOUT = "OUI" (or not specified),
               /GROUP_MA = grma,
             ◆ VALE = float,
          ),
        ◇ RCCM_RX =/"OUI" (by default),
                    /"NON ",
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices