Syntax
=====

.. code-block:: text

    IMPR_CO (
        ◇ UNITE = unit (default: 8),
        ◇ NIVEAU =/-1,
                   /0,
                   /1,
                   /2 (by default),
        ◇ ATTRIBUT =/"NON" (by default),
                     /"OUI ",
        ◇ CONTENU =/"NON ",
                    /"OUI" (by default),
        ◇ BASE =/"",
                 /"G" (by default),
                 /"V",
                 /"L",
        ◆/CONCEPT = _F (
               ◆ NOM = data structure,
            ),
          /CHAINE = text,
          /TOUT = "OUI" (or not specified),
        ◇ POSITION = int (default: 1),
        # If: equal_to (" NIVEAU ", -1)
            ◇ PERMUTATION =/"NON ",
                            /"OUI" (by default),
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices