Syntax
=====

.. code-block:: text

    /vect_elem_pres_c
    /vect_elem_temp_r
    /vect_elem_depl_r = CALC_VECT_ELEM (
        ◆ OPTION =/"CHAR_MECA ",
                   /"CHAR_THER ",
                   /"CHAR_ACOU ",
        # If: equal_to (" OPTION ", 'CHAR_MECA')
            ◆ | LOAD = char_meca,
              | MODEL = model,
            # If: exists (" CHARGE ")
                ◇ CHAM_MATER = mater_field,
                ◇ CARA_ELEM = cara_elem,
                ◇ INST = float,
                ◇ MODE_FOURIER = int,
            # If: (exists (" MODELE "))
                ◆ SOUS_STRUC = _F (
                     ◆ CAS_CHARGE = text,
                     ◆/TOUT = "OUI" (or not specified),
                       /SUPER_MAILLE = my,
                  ),
        # If: equal_to (" OPTION ", 'CHAR_THER')
            ◇ CARA_ELEM = cara_elem,
            ◆ CHARGE = char_ther,
            ◇ INST = float,
        # If: equal_to (" OPTION ", 'CHAR_ACOU')
            ◆ CHAM_MATER = cham_master,
            ◆ CHARGE = char_acou,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices