Syntax
=====

.. code-block:: text

    IMPR_CONCEPT (
        ◇ FORMAT =/"MED" (by default),
                   /"RESULTAT ",
        ◇ UNITE = unit (default: 80),
        # If: equal_to (" FORMAT ", 'MED')
            ◇ VERSION_MED =/"3.3.1" (by default),
                            /"4.0.0",
                            /"4.1.0",
        ◆ CONCEPT = _F (
             ◆/CHAM_MATER = cham_master,
               /CARA_ELEM = cara_elem,
               /CHARGE = char_meca,
             # If: exists (" CARA_ELEM ")
                 ◇ REPERE_LOCAL =/"NON" (by default),
                                  /"ELEM ",
                                  /"ELNO ",
                 # If: not equal_to (" REPERE_LOCAL ", 'NON')
                     ◆ MODELE = model,
          ),
        ◇ INFO =/1 (by default),
                 /2,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices