Syntax
=====

.. code-block:: text

    /Fashion_meca
    /data structure
    /dyna_harmo
    /mode_meca_c = DYNA_VISCO (
        ◆ MODELE = model,
        ◇ CARA_ELEM = cara_elem,
        ◇ MATER_ELAS = _F (
             ◆ | TO SUBdue = to subdue,
               | E = float,
               | AMOR_HYST = float,
               | RHO = float,
               | NU = float,
             ◆ GROUP_MA = Grma,
          ),
        ◆ MATER_ELAS_FO = _F (
             ◆ E = formula/function,
             ◆ AMOR_HYST = formula/function,
             ◆ RHO = float,
             ◆ NU = float,
             ◆ GROUP_MA = Grma,
          ),
        ◇ TYPE_RESU =/"HARM" (by default),
                      /"MODE ",
        ◆/FREQ = float,
          /LIST_FREQ = listr8,
        ◆ EXCIT = _F (
             ◆ CHARGE = char_meca,
          ),
        # If: equal_to (" TYPE_RESU ", 'MODE')
            ◇ TYPE_MODE =/"REEL" (by default),
                          /"BETA_REEL ",
                          /"COMPLEXE ",
        # If: not equal_to (" TYPE_RESU ", 'MODE')
            ◇ TYPE_MODE =/"REEL" (by default),
                          /"BETA_REEL ",
        ◇ RESI_RELA = float (default: 0.001),
        # If: equal_to (" TYPE_RESU ", 'HARM')
            ◆ COEF_FREQ_MAX = float,
            SOLVEUR = _F (
                 ◇ METHODE =/"LDLT" (by default),
                             /"MUMPS ",
                 # If: equal_to (" METHODE ", 'MULT_FRONT')
                     ◇ RENUM =/"MD",
                               /"MDA" (by default),
                     ◇ NPREC = int (default: 8),
                     ◇ ELIM_LAGR =/"OUI ",
                                   /"NON" (by default),
                     ◇ STOP_SINGULIER =/"OUI" (by default),
                                        /"NON ",
                 # If: equal_to (" METHODE ", 'LDLT')
                     ◇ RENUM = "RCMK ",
                     ◇ NPREC = int (default: 8),
                     ◇ ELIM_LAGR =/"OUI ",
                                   /"NON" (by default),
                     ◇ STOP_SINGULIER =/"OUI" (by default),
                                        /"NON ",
                 # If: equal_to (" METHODE ", 'MUMPS')
                     ◇ RENUM =/"AMD ",
                               /"AMF ",
                               /"PORD ",
                               /"METIS ",
                               /"QAMD ",
                               /"SCOTCH ",
                               /"AUTO" (by default),
                               /"PARMETIS ",
                               /"PTSCOTCH ",
                     ◇ NPREC = int (default: 8),
                     ◇ ELIM_LAGR =/"OUI ",
                                   /"NON ",
                                   /"LAGR2" (by default),
                     ◇ STOP_SINGULIER =/"OUI" (by default),
                                        /"NON ",
                     ◇ TYPE_RESOL =/"NONSYM ",
                                    /"SYMGEN ",
                                    /"SYMDEF ",
                                    /"AUTO" (by default),
                     ◇ ACCELERATION =/"AUTO ",
                                      /"FR" (by default),
                                      /"FR+",
                                      /"FR++",
                                      /"LR",
                                      /"LR+",
                                      /"LR++",
                     ◇ LOW_RANK_SEUIL = float,
                     ◇ PRETRAITEMENTS =/"SANS ",
                                        /"AUTO" (by default),
                     ◇ POSTTRAITEMENTS =/"SANS ",
                                         /"AUTO" (by default),
                                         /"FORCE ",
                                         /"MINI ",
                     ◇ PCENT_PIVOT = int (default: 35),
                     ◇ NB_RHS = int (default: 1),
                     ◇ RESI_RELA = float (default: -1.0),
                     ◇ GESTION_MEMOIRE =/"IN_CORE ",
                                         /"OUT_OF_CORE ",
                                         /"AUTO" (by default),
                                         /"EVAL ",
                 # If: equal_to (" METHODE ", 'GCPC')
                     ◇ ELIM_LAGR =/"OUI ",
                                   /"NON" (by default),
                     ◇ PRE_COND =/"LDLT_INC" (by default),
                                  /"LDLT_SP ",
                                  /"LDLT_DP ",
                     ◇ RESI_RELA = float (default: 1e-06),
                     ◇ NMAX_ITER = int,
                     # If: equal_to (" PRE_COND ", 'LDLT_INC')
                         ◇ RENUM = "RCMK ",
                         ◇ NIVE_REMPLISSAGE = int,
                     # If: is_in (" PRE_COND ", ('LDLT_SP', 'LDLT_DP'))
                         ◇ RENUM =/"SANS ",
                                   /"METIS ",
                                   /"PARMETIS" (by default),
                         ◇ REAC_PRECOND = int (default: 30),
                         ◇ PCENT_PIVOT = int (default: 20),
                         ◇ GESTION_MEMOIRE =/"IN_CORE ",
                                             /"AUTO" (by default),
                         ◇ LOW_RANK_SEUIL = float,
                 # If: equal_to (" METHODE ", 'PETSC')
                     ◇ ELIM_LAGR =/"OUI ",
                                   /"NON" (by default),
                     ◇ ALGORITHME =/"CG",
                                    /"CR",
                                    /"GMRES ",
                                    /"GCR ",
                                    /"FGMRES" (by default),
                                    /"GMRES_LMP ",
                     ◇ OPTION_PETSC = text,
                     ◇ PRE_COND =/"LDLT_INC ",
                                  /"LDLT_SP" (by default),
                                  /"LDLT_DP ",
                                  /"JACOBI ",
                                  /"SOR ",
                                  /"ML",
                                  /"BOOMER ",
                                  /"GAMG ",
                                  /"BLOC_LAGR ",
                                  /"FIELDSPLIT ",
                                  /"UTILISATEUR ",
                                  /"HPDDM ",
                                  /"SANS ",
                     ◇ RESI_RELA = float (default: 1e-06),
                     ◇ NMAX_ITER = int,
                     # If: equal_to (" PRE_COND ", 'LDLT_INC')
                         ◇ RENUM = "RCMK ",
                         ◇ NIVE_REMPLISSAGE = int,
                         ◇ REMPLISSAGE = float (default: 1.0),
                     # If: is_in (" PRE_COND ", ('LDLT_SP', 'LDLT_DP'))
                         ◇ RENUM =/"SANS ",
                                   /"METIS ",
                                   /"PARMETIS" (by default),
                         ◇ REAC_PRECOND = int (default: 30),
                         ◇ PCENT_PIVOT = int (default: 20),
                         ◇ GESTION_MEMOIRE =/"IN_CORE ",
                                             /"AUTO" (by default),
                         ◇ LOW_RANK_SEUIL = float,
                     # If: equal_to (" PRE_COND ", 'ML')
                         ◇ RENUM = "SANS ",
                     # If: equal_to (" PRE_COND ", 'BOOMER')
                         ◇ RENUM = "SANS ",
                     # If: equal_to (" PRE_COND ", 'GAMG')
                         ◇ RENUM = "SANS ",
                     # If: equal_to (" PRE_COND ", 'HPDDM')
                         ◇ RENUM = "SANS ",
                     # If: equal_to (" PRE_COND ", 'BLOC_LAGR')
                         ◇ RENUM = "SANS ",
                     # If: is_in (" PRE_COND ", ('FIELDSPLIT'))
                         ◇ RENUM = "SANS ",
                         ◇ PARTITION_CMP = int,
                         ◇ NOM_CMP = text,
                     # If: is_in (" PRE_COND ", ('UTILISATEUR'))
                         ◇ KSP_UTIL = not_checked,
                         ◇ RENUM = "SANS ",
                     # If: is_in (" PRE_COND ", ('JACOBI', '', 'SOR', 'SANS'))
                         ◇ RENUM =/"SANS" (by default),
                                   /"RCMK ",
              ),
            ◇ NOM_CHAM =/"DEPL" (by default),
                         /"VITE ",
                         /"ACCE ",
            ◇ MODE_MECA = co,
        ◇ INFO =/1 (by default),
                 /2,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices