Syntax
=====

.. code-block:: text

    vect_asse_gene = RECU_GENE (
        ◆ RESU_GENE = tran_gene/harm_gene,
        ◆/INST = float,
          /FREQ = float,
        ◇ NOM_CHAM =/"DEPL" (by default),
                     /"VITE ",
                     /"ACCE ",
        # If: exists (" INST ") and not exists (" FREQ ")
            ◇ INTERPOL =/"NON" (by default),
                         /"LIN ",
            ◇ CRITERE =/"RELATIF" (by default),
                        /"ABSOLU ",
            # If: (equal_to (" CRITERE ", 'RELATIF'))
                ◇ PRECISION = float (default: 1e-06),
            # If: (equal_to (" CRITERE ", 'ABSOLU'))
                ◆ PRECISION = float,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices