Syntax
=====

.. code-block:: text

    result = POST_CHAMP (
        ◆ RESULTAT = result,
        ◇/TOUT_ORDRE = "OUI" (or not specified),
          /NUME_ORDRE = int,
          /INST = float,
          /FREQ = float,
          /NUME_MODE = int,
          /NOEUD_CMP = text,
          /LIST_INST = listr8,
          /LIST_FREQ = listr8,
          /LIST_ORDRE = listis,
          /NOM_CAS = text,
        # If: (exists (" FREQ ")) or (exists (" LIST_FREQ ")) or (exists (" INST ")) or (exists (" LIST_INST "))
            ◇ CRITERE =/"RELATIF" (by default),
                        /"ABSOLU ",
            # If: (equal_to (" CRITERE ", 'RELATIF'))
                ◇ PRECISION = float (default: 1e-06),
            # If: (equal_to (" CRITERE ", 'ABSOLU'))
                ◆ PRECISION = float,
        ◇/TOUT = "OUI" (or not specified),
          /GROUP_MA = grma,
        ◆/EXTR_COQUE = _F (
               ◆ NOM_CHAM =/"EPEQ_ELGA ",
                            /"EPEQ_ELNO ",
                            /"EPSI_ELGA ",
                            /"EPSI_ELNO ",
                            /"SIEF_ELGA ",
                            /"SIEF_ELNO ",
                            /"SIEQ_ELGA ",
                            /"SIEQ_ELNO ",
                            /"SIGM_ELGA ",
                            /"SIGM_ELNO ",
                            /"VARC_ELGA ",
                            /"VARI_ELGA ",
                            /"VARI_ELNO ",
                            /"EPVC_ELGA ",
                            /"EPVC_ELNO ",
                            /"EPME_ELGA ",
                            /"EPME_ELNO ",
                            /"EPSP_ELGA ",
                            /"EPSP_ELNO ",
               ◆ NUME_COUCHE = int,
               ◆ NIVE_COUCHE =/"SUP ",
                               /"INF ",
                               /"MOY ",
            ),
          /EXTR_TUYAU = _F (
               ◆ NOM_CHAM =/"EPEQ_ELGA ",
                            /"EPEQ_ELNO ",
                            /"EPSI_ELGA ",
                            /"EPSI_ELNO ",
                            /"SIEF_ELGA ",
                            /"SIEF_ELNO ",
                            /"SIEQ_ELGA ",
                            /"SIEQ_ELNO ",
                            /"SIGM_ELGA ",
                            /"SIGM_ELNO ",
                            /"VARC_ELGA ",
                            /"VARI_ELGA ",
                            /"VARI_ELNO ",
                            /"EPVC_ELGA ",
                            /"EPVC_ELNO ",
                            /"EPME_ELGA ",
                            /"EPME_ELNO ",
                            /"EPSP_ELGA ",
                            /"EPSP_ELNO ",
               ◆ NUME_COUCHE = int,
               ◆ NIVE_COUCHE =/"SUP ",
                               /"INF ",
                               /"MOY ",
               ◆ ANGLE = int,
            ),
          /EXTR_PMF = _F (
               ◆ NOM_CHAM =/"EPEQ_ELGA ",
                            /"EPEQ_ELNO ",
                            /"EPSI_ELGA ",
                            /"EPSI_ELNO ",
                            /"SIEF_ELGA ",
                            /"SIEF_ELNO ",
                            /"SIEQ_ELGA ",
                            /"SIEQ_ELNO ",
                            /"SIGM_ELGA ",
                            /"SIGM_ELNO ",
                            /"VARC_ELGA ",
                            /"VARI_ELGA ",
                            /"VARI_ELNO ",
                            /"EPVC_ELGA ",
                            /"EPVC_ELNO ",
                            /"EPME_ELGA ",
                            /"EPME_ELNO ",
                            /"EPSP_ELGA ",
                            /"EPSP_ELNO ",
               ◆ NUME_FIBRE = int,
            ),
          /MIN_MAX_SP = _F (
               ◆ NOM_CHAM =/"EPEQ_ELGA ",
                            /"EPEQ_ELNO ",
                            /"EPSI_ELGA ",
                            /"EPSI_ELNO ",
                            /"SIEF_ELGA ",
                            /"SIEF_ELNO ",
                            /"SIEQ_ELGA ",
                            /"SIEQ_ELNO ",
                            /"SIGM_ELGA ",
                            /"SIGM_ELNO ",
                            /"VARC_ELGA ",
                            /"VARI_ELGA ",
                            /"VARI_ELNO ",
                            /"EPVC_ELGA ",
                            /"EPVC_ELNO ",
                            /"EPME_ELGA ",
                            /"EPME_ELNO ",
                            /"EPSP_ELGA ",
                            /"EPSP_ELNO ",
               ◆/NOM_CMP = text,
                 /NOM_VARI = text,
               ◆ TYPE_MAXI =/"MAXI ",
                             /"MINI ",
                             /"MAXI_ABS ",
                             /"MINI_ABS ",
               ◆ NUME_CHAM_RESU = int,
            ),
          /COQU_EXCENT = _F (
               ◆ NOM_CHAM =/"EFGE_ELNO ",
                            /"EFGE_ELGA ",
               ◆ MODI_PLAN = "OUI" (or not specified),
            ),
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices