Syntax
=====
               

.. code-block:: text

    /grill
    /mesh
    /skeleton = DEFI_GROUP (
        ◆ reuse = <objet de MAILLAGE ou GRILLE >,
        ◆/MAILLAGE = mesh/skeleton,
          /GRILLE = grid,
        ◆ | DETR_GROUP_MA = _F (
               ◆ NOM = text,
            ),
          | CREA_GROUP_MA = _F (
               ◆ NOM = text,
               ◆/TOUT = "OUI" (or not specified),
                 /GROUP_MA = grma,
                 /INTERSEC = grma,
                 /UNION = grma,
                 /DIFFE = grma,
                 /OPTION =/"APPUI ",
                            /"BANDE ",
                            /"CYLINDRE ",
                            /"FACE_NORMALE ",
                            /"FISS_XFEM ",
                            /"SPHERE ",
               ◇ TYPE_MAILLE =/"1D",
                               /"2D",
                               /"3D",
                               /"HEXA20 ",
                               /"HEXA27 ",
                               /"HEXA8 ",
                               /"PENTA15 ",
                               /"PENTA18 ",
                               /"PENTA6 ",
                               /"POI1 ",
                               /"PYRAM13 ",
                               /"PYRAM5 ",
                               /"QUAD4 ",
                               /"QUAD8 ",
                               /"QUAD9 ",
                               /"SEG2 ",
                               /"SEG3 ",
                               /"SEG4 ",
                               /"TETRA10 ",
                               /"TETRA4 ",
                               /"TOUT" (by default),
                               /"TRIA3 ",
                               /"TRIA6 ",
                               /"TRIA7 ",
               # If: exists (" GROUP_MA ")
                   ◇/NUME_INIT = int,
                     /POSITION =/"FIN ",
                                  /"INIT ",
                                  /"MILIEU ",
                   # If: exists (" NUME_INIT ")
                       ◇ NUME_FIN = int,
               # If: equal_to (" OPTION ", 'FACE_NORMALE')
                   ◆/ANGL_NAUT = float,
                     /VECT_NORMALE = float,
                   ◇ ANGL_PREC = float (default: 0.5),
                   ◇ VERI_SIGNE =/"NON ",
                                  /"OUI" (by default),
               # If: equal_to (" OPTION ", 'SPHERE')
                   ◆/POINT = float,
                     /GROUP_NO_CENTRE = grno,
                   ◆ RAYON = float,
                   ◇ CRIT_NOEUD =/"AU_MOINS_UN" (by default),
                                  /"MAJORITE ",
                                  /"TOUS ",
               # If: equal_to (" OPTION ", 'CYLINDRE')
                   ◆/POINT = float,
                     /GROUP_NO_CENTRE = grno,
                   ◆ RAYON = float,
                   ◆/ANGL_NAUT = float,
                     /VECT_NORMALE = float,
                   ◇ CRIT_NOEUD =/"AU_MOINS_UN" (by default),
                                  /"MAJORITE ",
                                  /"TOUS ",
               # If: equal_to (" OPTION ", 'BANDE')
                   ◆/POINT = float,
                     /GROUP_NO_CENTRE = grno,
                   ◆ DIST = float,
                   ◆/ANGL_NAUT = float,
                     /VECT_NORMALE = float,
                   ◇ CRIT_NOEUD =/"AU_MOINS_UN" (by default),
                                  /"MAJORITE ",
                                  /"TOUS ",
               # If: equal_to (" OPTION ", 'APPUI')
                   ◆/GROUP_NO = grno,
                   ◆ TYPE_APPUI =/"AU_MOINS_UN ",
                                  /"MAJORITE ",
                                  /"SOMMET ",
                                  /"TOUT ",
               # If: equal_to (" OPTION ", 'FISS_XFEM')
                   ◇ TYPE_GROUP =/"CRACKTIP ",
                                  /"FISSUREE ",
                                  /"HEAVISIDE ",
                                  /"MIXTE ",
                                  /"XFEM" (by default),
                   ◆ FISSURE = fiss_xfem,
            ),
          | CREA_GROUP_NO = _F (
               ◇ OPTION =/"ENV_CYLINDRE ",
                          /"ENV_SPHERE ",
                          /"FISS_XFEM ",
                          /"INCLUSION ",
                          /"INTERVALLE_VALE ",
                          /"NOEUD_ORDO ",
                          /"PLAN ",
                          /"RELA_CINE_BP ",
                          /"SEGM_DROI_ORDO ",
                          /"TUNNEL ",
               # If: not exists (" OPTION ")
                   ◆/TOUT_GROUP_MA = "OUI" (or not specified),
                     /GROUP_MA = grma,
                     /GROUP_NO = grno,
                     /INTERSEC = grno,
                     /UNION = grno,
                     /DIFFE = grno,
                   # If: exists (" GROUP_MA ")
                       ◇ NOM = text,
                       ◇ CRIT_NOEUD =/"CENTRE ",
                                      /"MILIEU ",
                                      /"SOMMET ",
                                      /"TOUS" (by default),
                   # If: exists (" GROUP_NO ")
                       ◇/NUME_INIT = int,
                         /POSITION =/"FIN ",
                                      /"INIT ",
                                      /"MILIEU ",
                       # If: exists (" NUME_INIT ")
                           ◇ NUME_FIN = int,
                   # If: not exists (" GROUP_MA ") and not exists (" TOUT_GROUP_MA ")
                       ◆ NOM = text,
               # If: equal_to (" OPTION ", 'ENV_SPHERE')
                   ◆ NOM = text,
                   ◆/POINT = float,
                     /GROUP_NO_CENTRE = grno,
                   ◆ RAYON = float,
                   ◆ PRECISION = float,
               # If: equal_to (" OPTION ", 'ENV_CYLINDRE')
                   ◆ NOM = text,
                   ◆/POINT = float,
                     /GROUP_NO_CENTRE = grno,
                   ◆ RAYON = float,
                   ◆/ANGL_NAUT = float,
                     /VECT_NORMALE = float,
                   ◆ PRECISION = float,
               # If: equal_to (" OPTION ", 'PLAN')
                   ◆ NOM = text,
                   ◆/POINT = float,
                     /GROUP_NO_CENTRE = grno,
                   ◆/ANGL_NAUT = float,
                     /VECT_NORMALE = float,
                   ◆ PRECISION = float,
               # If: equal_to (" OPTION ", 'SEGM_DROI_ORDO')
                   ◆ NOM = text,
                   ◇ GROUP_NO = big,
                   ◆ GROUP_NO_ORIG = grno,
                   ◆ GROUP_NO_EXTR = grno,
                   ◆ PRECISION = float,
                   ◆ CRITERE =/"ABSOLU ",
                               /"RELATIF ",
               # If: equal_to (" OPTION ", 'NOEUD_ORDO')
                   ◆ NOM = text,
                   ◆ GROUP_MA = GRMA,
                   ◇ GROUP_NO_ORIG = big,
                   ◇ GROUP_NO_EXTR = big,
                   ◇ VECT_ORIE = float,
                   ◇ ORIGINE = "SANS" (or not specified),
               # If: equal_to (" OPTION ", 'TUNNEL')
                   ◆ NOM = text,
                   ◆ | ALL = "YES" (or not specified),
                     | GROUP_MA = grma,
                   ◇ GROUP_MA_AXE = Grma,
                   ◇ GROUP_NO_ORIG = big,
                   ◆ RAYON = float,
                   ◇ LONGUEUR = float,
               # If: equal_to (" OPTION ", 'INCLUSION')
                   ◆ NOM = text,
                   ◆ CAS_FIGURE =/"2.5D",
                                  /"2D",
                                  /"3D",
                   ◇ DISTANCE_MAX = float,
                   ◆ GROUP_MA = GRMA,
                   ◆ GROUP_MA_INCL = Grma,
                   ◇ MAILLAGE_INCL = mesh,
               # If: equal_to (" OPTION ", 'FISS_XFEM')
                   ◆ NOM = text,
                   ◆ TYPE_GROUP =/"CRACKTIP ",
                                  /"HEAVISIDE ",
                                  /"MIXTE ",
                                  /"TORE ",
                                  /"XFEM ",
                                  /"ZONE_MAJ ",
                   ◆ FISSURE = fiss_xfem,
                   # If: equal_to (" TYPE_GROUP ", 'TORE')
                       ◆ RAYON_TORE = float,
               # If: equal_to (" OPTION ", 'INTERVALLE_VALE')
                   ◆ NOM = text,
                   ◆ CHAM_GD = cham_no,
                   ◆ NOM_CMP = text,
                   ◆ VALE = float,
               # If: equal_to (" OPTION ", 'RELA_CINE_BP')
                   ◆ CABLE_BP = cabl_precont,
                   ◇ PREF_GRNO = text (default: "RCBP "),
            ),
          | DETR_GROUP_NO = _F (
               ◆ NOM = text,
            ),
        ◇ ALARME =/"NON ",
                   /"OUI" (by default),
        ◇ INFO =/1,
                 /2,
    )
    
    ◆: mandatory
    ◇: optional
    : present by default
    &: together
    /: only one among
    |: several possible choices