Syntax
=====

.. code-block:: text

    char_meca = DEFI_CHAR_SOL (
        ◇ CHARGEMENT =/"FORCE" (by default),
                       /"ONDE_PLANE ",
        ◆ MODELE = model,
        ◆/UNITE_TRAN_INIT = unit,
          /RESU_INIT = evol_noli/dyna_trans/evol_char,
        # If: exists (" UNITE_TRAN_INIT ")
            ◇ LONG_CARA = float,
            ◇ AXE =/"X",
                    /"Y",
                    /"Z",
            ◇ NOM_PARA =/"Y",
                         /"Z" (by default),
            ◇ Z0 = float,
            ◇ NOM_CMP =/"DX" (by default),
                        /"DY",
            ◆ | GROUP_MY_RIGHT = grma,
              | GROUP_MY_LEFT = grma,
            ◆ TABLE_MATER_ELAS = table,
        # If: exists (" RESU_INIT ")
            ◇ MATR_RIGI = matr_asse_depl_r,
            ◇ COEF = float (default: 1.0),
            ◇ NOM_CHAM_INIT =/"ACCE ",
                              /"FORC_NODA" (by default),
                              /"REAC_NODA ",
            ◇ DDL_EXCLUS =/"DX",
                           /"DY",
                           /"DZ",
                           /"DRX ",
                           /"DRY ",
                           /"DRZ ",
            ◇ MATR_AMOR = matr_asse_depl_r,
            ◇ NUME_DDL = nume_ddl,
            ◆ LIST_INST = listr8,
            ◇ PRECISION = float (default: 1e-06),
            ◇ CRITERE =/"RELATIF" (by default),
                        /"ABSOLU ",
        ◇ TITRE = text,
        ◇ INFO =/1 (by default),
                 /2,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices