Syntax
=====

.. code-block:: text

    meca_mode = COMB_SISM_MODAL (
        ◆ MODE_MECA = meca fashion,
        ◇/TOUT_ORDRE =/"OUI ",
                         /"NON ",
          /NUME_ORDRE = int,
          /FREQ = float,
          /NUME_MODE = int,
          /LIST_FREQ = listr8,
          /LIST_ORDRE = listis,
        # If: exists (" FREQ ") or exists (" LIST_FREQ ")
            ◇ PRECISION = float (default: 0.001),
            ◇ CRITERE =/"RELATIF" (by default),
                        /"ABSOLU ",
        ◆/AMOR_REDUIT = float,
          /LIST_AMOR = listr8,
          /AMOR_GENE = matr_asse_gene_r,
        ◇ MODE_CORR =/"OUI ",
                      /"NON" (by default),
        # If: equal_to (" MODE_CORR ", 'OUI')
            ◆ PSEUDO_MODE = meca fashion,
            ◇ FREQ_COUP = float,
        ◇ TYPE_ANALYSE =/"MONO_APPUI" (by default),
                         /"MULT_APPUI ",
        # If: equal_to (" TYPE_ANALYSE ", 'MULT_APPUI')
            ◆ APPUIS = _F (
                 ◆ NOM = text,
                 ◆ GROUP_NO = grno,
              ),
        # If: equal_to (" TYPE_ANALYSE ", 'MONO_APPUI')
            ◆ SPECTRE = _F (
                 ◆ LIST_AXE =/"X",
                              /"Y",
                              /"Z",
                 ◆ SPEC_OSCI = formula/tablecloth,
                 ◇ ECHELLE = float (default: 1.0),
                 ◇ NATURE =/"ACCE" (by default),
                            /"VITE ",
                            /"DEPL ",
                 ◇ CORR_FREQ =/"OUI ",
                               /"NON" (by default),
              ),
        # If: equal_to (" TYPE_ANALYSE ", 'MULT_APPUI')
            ◆ SPECTRE = _F (
                 ◆ LIST_AXE =/"X",
                              /"Y",
                              /"Z",
                 ◆ SPEC_OSCI = formula/tablecloth,
                 ◇ ECHELLE = float (default: 1.0),
                 ◇ NATURE =/"ACCE" (by default),
                            /"VITE ",
                            /"DEPL ",
                 ◇ CORR_FREQ =/"OUI ",
                               /"NON" (by default),
                 ◆ NOM_APPUI = text,
              ),
        ◇ DEPL_MULT_APPUI = _F (
             ◆ MODE_STAT = meca fashion,
             ◆ NOM_APPUI = text,
             ◆ | DX = float,
               | DY = float,
               | DZ = float,
          ),
        ◆ COMB_MODE = _F (
             ◇ TYPE =/"SRSS ",
                      /"CQC" (by default),
                      /"DSC ",
                      /"ABS ",
                      /"DPC ",
                      /"GUPTA ",
             # If: equal_to (" TYPE ", 'GUPTA')
                 ◆ FREQ_1 = float,
                 ◆ FREQ_2 = float,
             # If: equal_to (" TYPE ", 'DSC')
                 ◆ DUREE = float,
          ),
        ◇ COMB_DIRECTION =/"QUAD ",
                           /"NEWMARK" (by default),
        # If: equal_to (" TYPE_ANALYSE ", 'MULT_APPUI')
            ◆ GROUP_APPUI_CORRELE = _F (
                 ◆/TOUT = "OUI" (or not specified),
                   /LIST_APPUI = text,
                 ◆ NOM = text,
              ),
        # If: equal_to (" TYPE_ANALYSE ", 'MULT_APPUI')
            ◇ COMB_DDS_CORRELE =/"QUAD ",
                                 /"LINE ",
                                 /"ABS" (by default),
        ◆ OPTION =/"DEPL ",
                   /"VITE ",
                   /"ACCE_ABSOLU ",
                   /"REAC_NODA ",
                   /"FORC_NODA ",
                   /"SIGM_ELNO ",
                   /"SIEF_ELGA ",
                   /"SIPO_ELNO ",
                   /"EFGE_ELNO ",
                   /"EGRU_ELNO ",
                   /"SIEF_ELNO ",
        # If: equal_to (" TYPE_ANALYSE ", 'MONO_APPUI')
            ◆ TYPE_RESU = _F (
                 ◇ TYPE =/"VALE_SPEC ",
                          /"VALE_QS ",
                          /"VALE_DIRE ",
                          /"VALE_DYNA ",
                          /"VALE_INER ",
                          /"VALE_TOTA" (by default),
                 # If: equal_to (" TYPE ", 'VALE_SPEC')
                     ◆/TOUT_ORDRE =/"OUI ",
                                      /"NON ",
                       /NUME_ORDRE = int,
                       /LIST_ORDRE = listis,
                       /NUME_MODE = int,
                       /FREQ = float,
                       /LIST_FREQ = listr8,
                     # If: exists (" FREQ ") or exists (" LIST_FREQ ")
                         ◇ PRECISION = float (default: 0.001),
                         ◇ CRITERE =/"RELATIF" (by default),
                                     /"ABSOLU ",
                     ◆ LIST_AXE =/"X",
                                  /"Y",
                                  /"Z",
                 # If: equal_to (" TYPE ", 'VALE_OSCI')
                     ◇ LIST_AXE =/"X",
                                  /"Y",
                                  /"Z",
                 # If: equal_to (" TYPE ", 'VALE_QS')
                     ◇ LIST_AXE =/"X",
                                  /"Y",
                                  /"Z",
                 # If: equal_to (" TYPE ", 'VALE_DIRE')
                     ◆ LIST_AXE =/"X",
                                  /"Y",
                                  /"Z",
                 # If: equal_to (" TYPE ", 'VALE_TOTA')
                     ◇ NEWMARK =/"OUI ",
                                 /"NON ",
                 # If: equal_to (" TYPE ", 'VALE_DYNA')
                     ◇ LIST_AXE =/"X",
                                  /"Y",
                                  /"Z",
                 # If: equal_to (" TYPE ", 'VALE_INER')
                     ◇ NEWMARK =/"OUI ",
                                 /"NON ",
                     ◇ LIST_AXE =/"X",
                                  /"Y",
                                  /"Z",
              ),
        # If: equal_to (" TYPE_ANALYSE ", 'MULT_APPUI')
            ◆ TYPE_RESU = _F (
                 ◇ TYPE =/"VALE_SPEC ",
                          /"VALE_QS ",
                          /"VALE_DIRE ",
                          /"VALE_DDS ",
                          /"VALE_DYNA ",
                          /"VALE_INER ",
                          /"VALE_TOTA" (by default),
                 # If: equal_to (" TYPE ", 'VALE_SPEC')
                     ◆/TOUT_ORDRE =/"OUI ",
                                      /"NON ",
                       /NUME_ORDRE = int,
                       /LIST_ORDRE = listis,
                       /NUME_MODE = int,
                       /FREQ = float,
                       /LIST_FREQ = listr8,
                     # If: exists (" FREQ ") or exists (" LIST_FREQ ")
                         ◇ PRECISION = float (default: 0.001),
                         ◇ CRITERE =/"RELATIF" (by default),
                                     /"ABSOLU ",
                     ◇/LIST_APPUI = text,
                       /TOUT_APPUI = "OUI" (or not specified),
                     ◆ LIST_AXE =/"X",
                                  /"Y",
                                  /"Z",
                 # If: equal_to (" TYPE ", 'VALE_OSCI')
                     ◇ LIST_AXE =/"X",
                                  /"Y",
                                  /"Z",
                 # If: equal_to (" TYPE ", 'VALE_QS')
                     ◇ LIST_AXE =/"X",
                                  /"Y",
                                  /"Z",
                 # If: equal_to (" TYPE ", 'VALE_DDS')
                     ◇ LIST_AXE =/"X",
                                  /"Y",
                                  /"Z",
                 # If: equal_to (" TYPE ", 'VALE_DIRE')
                     ◆ LIST_AXE =/"X",
                                  /"Y",
                                  /"Z",
                 # If: equal_to (" TYPE ", 'VALE_TOTA')
                     ◇ NEWMARK = "OUI" (or not specified),
                 # If: equal_to (" TYPE ", 'VALE_DYNA')
                     ◇ LIST_AXE =/"X",
                                  /"Y",
                                  /"Z",
                 # If: equal_to (" TYPE ", 'VALE_INER')
                     ◇ LIST_AXE =/"X",
                                  /"Y",
                                  /"Z",
              ),
        ◇ INFO =/1 (by default),
                 /2,
        ◇ TITRE = text,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices