Syntax
=====

.. code-block:: text

    table = MACR_SPECTRE (
        ◇ MAILLAGE = mesh,
        # If: exists (" MAILLAGE ")
            ◆ PLANCHER = _F (
                 ◆ NOM = text,
                 ◇ BATIMENT = text,
                 ◇ COMMENTAIRE = text,
                 ◆ | GROUP_NO = group,
              ),
        # If: not exists (" MAILLAGE ")
            ◆ PLANCHER = _F (
                 ◆ NOM = text,
                 ◇ BATIMENT = text,
                 ◇ COMMENTAIRE = text,
                 ◆ NOEUD = no,
              ),
        ◆ NOM_CHAM =/"ACCE ",
                     /"DEPL ",
        ◆ CALCUL =/"ABSOLU ",
                   /"RELATIF ",
        ◇ ENVELOPPE =/"NON" (by default),
                      /"OUI ",
        # If: equal_to (" NOM_CHAM ", 'ACCE') and equal_to (" CALCUL ", 'RELATIF')
            ◆ AMOR_SPEC = float,
            ◇ LIST_INST = listr8,
            ◆/LIST_FREQ = listr8,
              /FREQ = float,
            ◆ NORME = float,
            ◆ RESU = _F (
                 ◆/TABLE = table,
                   /RESU_GENE = tran_gene,
                   /RESULTAT = dyna_trans/evol_noli,
                 ◆ ACCE_X = function,
                 ◆ ACCE_Y = function,
                 ◆ ACCE_Z = function,
              ),
        # If: equal_to (" NOM_CHAM ", 'ACCE') and equal_to (" CALCUL ", 'ABSOLU')
            ◆ AMOR_SPEC = float,
            ◇ LIST_INST = listr8,
            ◆/LIST_FREQ = listr8,
              /FREQ = float,
            ◆ NORME = float,
            ◆ RESU = _F (
                 ◆/TABLE = table,
                   /RESU_GENE = tran_gene,
                   /RESULTAT = dyna_trans/evol_noli,
              ),
            ◇ MULT_APPUI = "OUI" (or not specified),
        # If: equal_to (" NOM_CHAM ", 'ACCE')
            ◇ IMPRESSION = _F (
                 ◇ TRI =/"AMOR_SPEC" (by default),
                         /"DIRECTION ",
                 ◇ FORMAT =/"TABLEAU" (by default),
                            /"XMGRACE ",
                 ◇ UNITE = unit (default: 29),
                 # If: equal_to (" FORMAT ", 'XMGRACE')
                     ◇ PILOTE =/"" (by default),
                                /"EPS ",
                                /"INTERACTIF ",
                                /"JPEG ",
                                /"MIF ",
                                /"PDF ",
                                /"PNG ",
                                /"PNM ",
                                /"POSTSCRIPT ",
                                /"SVG ",
                 ◇ TOUT =/"NON" (by default),
                          /"OUI ",
              ),
        # If: equal_to (" NOM_CHAM ", 'DEPL') and equal_to (" CALCUL ", 'RELATIF')
            ◇ LIST_INST = listr8,
            ◆ RESU = _F (
                 ◆/TABLE = table,
                   /RESU_GENE = tran_gene,
                   /RESULTAT = dyna_trans/evol_noli,
              ),
        # If: equal_to (" NOM_CHAM ", 'DEPL') and equal_to (" CALCUL ", 'ABSOLU')
            ◇ LIST_INST = listr8,
            ◆ RESU = _F (
                 ◆/TABLE = table,
                   /RESU_GENE = tran_gene,
                   /RESULTAT = dyna_trans/evol_noli,
                 ◆ DEPL_X = function,
                 ◆ DEPL_Y = function,
                 ◆ DEPL_Z = function,
              ),
    )

    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices