Syntax
=====
               

.. code-block:: text

    evol_ther = CALC_META (
        ◆ reuse = <objet de RESULTAT >,
        ◇ MODELE = model,
        ◇ CHAM_MATER = mater_field,
        ◆ RESULTAT = evol_ther,
        ◆ OPTION =/"DURT_ELNO ",
                   /"DURT_NOEU ",
                   /"META_ELNO ",
                   /"META_NOEU ",
        ◇/TOUT = "OUI" (or not specified),
          /GROUP_MA = grma,
        # If: is_in ('OPTION', ('META_ELNO', 'META_NOEU'))
            ◆ ETAT_INIT = _F (
                 ◆/EVOL_THER = evol_ther,
                   /META_INIT_ELNO = card,
                 # If: exists (" EVOL_THER ")
                     ◆/NUME_INIT = int,
                       /INST_INIT = float,
                     # If: exists (" INST_INIT ")
                         ◇ CRITERE =/"ABSOLU ",
                                     /"RELATIF" (by default),
                         # If: (equal_to (" CRITERE ", 'RELATIF'))
                             ◇ PRECISION = float (default: 1e-06),
                         # If: (equal_to (" CRITERE ", 'ABSOLU'))
                             ◆ PRECISION = float,
              ),
            ◆ COMPORTEMENT = _F (
                 ◆ RELATION =/"ACIER ",
                              /"ACIER_REVENU ",
                              /"ZIRC ",
                 # If: equal_to (" RELATION ", 'ACIER')
                     ◇ LOI_META = "WAECKEL ",
                 # If: equal_to (" RELATION ", 'ZIRC')
                     ◇ LOI_META = "EDGAR ",
                 ◇/TOUT = "OUI" (or not specified),
                   /| GROUP_MA = grma,
              ),
            ◇ REVENU = _F (
                 ◆ RELATION = "ACIER_REVENU" (or not specified),
                 # If: equal_to (" RELATION ", 'ACIER_REVENU')
                     ◇ LOI_META = "JMA ",
                 ◇/TOUT = "OUI" (or not specified),
                   /| GROUP_MA = grma,
              ),
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices