General syntax
====

.. code-block:: text

    char_meca = AFFE_CHAR_MECA (
        ◇ VERI_AFFE =/"OUI" (by default),
                      /"NON ",
        ◇ VERI_NORM =/"OUI" (by default),
                      /"NON ",
        ◆ MODELE = model,
        ◇ CARA_ELEM = cara_elem,
        ◇ CHAM_MATER = mater_field,
          | EVOL_CHAR = evol_char,
        ◆ | GRAVITY = _F (
               ◇ GROUP_MA = Grma,
               ◆ GRAVITE = float,
               ◆ DIRECTION = float,
            ),
          | ROTATION = _F (
               ◇ GROUP_MA = Grma,
               ◇ SANS_GROUP_MA = Grma,
               ◆ VITESSE = float,
               ◆ AXE = float,
               ◇ CENTRE = float,
            ),
          | DDL_IMPO = _F (
               ◆ | ALL = "YES" (or not specified),
                 | GROUP_MA = grma,
                 | GROUP_NO = group,
               ◇ SANS_GROUP_MA = Grma,
               ◇ SANS_GROUP_NO = big,
               ◆ | BLOCKING =/"MOVE",
                             /"ROTATION ",
                             /"TUYAU_FOURIER ",
                 | DX = float,
                 | DY = float,
                 | DZ = float,
                 | DRX = float,
                 | DRY = float,
                 | DRZ = float,
                 | GRX = float,
                 | PRES = float,
                 | PSI = float,
                 | PHI = float,
                 | DRGX = float,
                 | DRGY = float,
                 | DRGZ = float,
                 | TEMP = float,
                 | PRE1 = float,
                 | PRE2 = float,
                 | UI2 = float,
                 | UI3 = float,
                 | VI2 = float,
                 | VI3 = float,
                 | WI2 = float,
                 | WI3 = float,
                 | UO2 = float,
                 | UO3 = float,
                 | VO2 = float,
                 | VO3 = float,
                 | WO2 = float,
                 | WO3 = float,
                 | UI4 = float,
                 | UI5 = float,
                 | VI4 = float,
                 | VI5 = float,
                 | WI4 = float,
                 | WI5 = float,
                 | UO4 = float,
                 | UO5 = float,
                 | VO4 = float,
                 | VO5 = float,
                 | WO4 = float,
                 | WO5 = float,
                 | UI6 = float,
                 | UO6 = float,
                 | VI6 = float,
                 | VO6 = float,
                 | WI6 = float,
                 | WO6 = float,
                 | WO = float,
                 | WI1 = float,
                 | WO1 = float,
                 | GONF = float,
                 | H1X = float,
                 | H1Y = float,
                 | H1Z = float,
                 | H1PRE1 = float,
                 | H2X = float,
                 | H2Y = float,
                 | H2Z = float,
                 | H2PRE1 = float,
                 | H3X = float,
                 | H3Y = float,
                 | H3Z = float,
                 | H3PRE1 = float,
                 | H4X = float,
                 | H4Y = float,
                 | H4Z = float,
                 | K1 = float,
                 | K2 = float,
                 | K3 = float,
                 | PRE_FLU = float,
                 | LAG_FLI = float,
                 | LAG_FLS = float,
                 | LAGS_C = float,
                 | LAGS_F1 = float,
                 | LAGS_F2 = float,
                 | PR2_FLU = float,
                 | LA2_FLI = float,
                 | LA2_FLS = float,
                 | LAG2_C = float,
                 | LAG2_F1 = float,
                 | LAG2_F2 = float,
                 | PR3_FLU = float,
                 | LA3_FLI = float,
                 | LA3_FLS = float,
                 | LAG3_C = float,
                 | LAG3_F1 = float,
                 | LAG3_F2 = float,
                 | LAG4_C = float,
                 | LAG4_F1 = float,
                 | LAG4_F2 = float,
                 | V11 = float,
                 | V12 = float,
                 | V13 = float,
                 | V21 = float,
                 | V22 = float,
                 | V23 = float,
                 | V31 = float,
                 | V32 = float,
                 | V33 = float,
                 | PRES11 = float,
                 | PRES12 = float,
                 | PRES13 = float,
                 | PRES21 = float,
                 | PRES22 = float,
                 | PRES23 = float,
                 | PRES31 = float,
                 | PRES32 = float,
                 | PRES33 = float,
                 | LH1 = float,
                 | GLIS = float,
            ),
          | DDL_BEAM = _F (
               ◆ | ALL = "YES" (or not specified),
                 | GROUP_MA = grma,
                 | GROUP_NO = group,
               ◇ SANS_GROUP_MA = Grma,
               ◇ SANS_GROUP_NO = big,
               ◆ | DX = float,
                 | DY = float,
                 | DZ = float,
                 | DRX = float,
                 | DRY = float,
                 | DRZ = float,
               ◆/VECT_Y = float,
                 /ANGL_VRIL = float,
               ◇ GROUP_MA_REPE = Grma,
            ),
          | FACE_IMPO = _F (
               ◇ GROUP_MA = Grma,
               ◇ SANS_GROUP_MA = Grma,
               ◇ SANS_GROUP_NO = big,
               ◆ | DX = float,
                 | DY = float,
                 | DZ = float,
                 | DRX = float,
                 | DRY = float,
                 | DRZ = float,
                 | GRX = float,
                 | PRES = float,
                 | PHI = float,
                 | TEMP = float,
                 | PRE1 = float,
                 | PRE2 = float,
                 | DNOR = float,
                 | DRNOR = float,
                 | DTAN = float,
            ),
          | CHAMNO_IMPO = _F (
               ◆ CHAM_NO = cham_no,
               ◆ COEF_IMPO = float,
            ),
          | ARETE_IMPO = _F (
               ◇ GROUP_MA = Grma,
               ◇ SANS_GROUP_MA = Grma,
               ◇ SANS_GROUP_NO = big,
               ◆ | DX = float,
                 | DY = float,
                 | DZ = float,
                 | DTAN = float,
                 | PRES = float,
                 | PHI = float,
                 | TEMP = float,
                 | PRE1 = float,
                 | PRE2 = float,
            ),
          | DDL_LINK = _F (
               ◆/GROUP_NO = grno,
               ◆ DDL =/"DX",
                       /"DY",
                       /"DZ",
                       /"DRX ",
                       /"DRY ",
                       /"DRZ ",
                       /"PRES ",
                       /"PHI ",
                       /"GONF ",
                       /"TEMP ",
                       /"PRE1 ",
                       /"PRE2 ",
                       /"GRX ",
                       /"DRGX ",
                       /"DRGY ",
                       /"DRGZ ",
                       /"PSI ",
                       /"UI2 ",
                       /"UI3 ",
                       /"VI2 ",
                       /"VI3 ",
                       /"WI2 ",
                       /"WI3 ",
                       /"UO2 ",
                       /"UO3 ",
                       /"VO2 ",
                       /"VO3 ",
                       /"WO2 ",
                       /"WO3 ",
                       /"UI4 ",
                       /"UI5 ",
                       /"VI4 ",
                       /"VI5 ",
                       /"WI4 ",
                       /"WI5 ",
                       /"UO4 ",
                       /"UO5 ",
                       /"VO4 ",
                       /"VO5 ",
                       /"WO4 ",
                       /"WO5 ",
                       /"UI6 ",
                       /"UO6 ",
                       /"VI6 ",
                       /"VO6 ",
                       /"WI6 ",
                       /"WO6 ",
                       /"WO",
                       /"WI1 ",
                       /"WO1 ",
                       /"H1X",
                       /"H1Y",
                       /"H1Z",
                       /"H 1PRE1 ",
                       /"K1",
                       /"K2",
                       /"K3",
                       /"V11",
                       /"V12",
                       /"V13",
                       /"V21",
                       /"V22",
                       /"V23",
                       /"V31",
                       /"V32",
                       /"V33",
                       /"PRES11 ",
                       /"PRES12 ",
                       /"PRES13 ",
                       /"PRES21 ",
                       /"PRES22 ",
                       /"PRES23 ",
                       /"PRES31 ",
                       /"PRES32 ",
                       /"PRES33 ",
                       /"LH1 ",
                       /"GLIS ",
               ◆ COEF_MULT = float,
               ◆ COEF_IMPO = float,
            ),
          | OBLIQU_LINK = _F (
               ◆ | GROUP_NO = group,
                 | GROUP_MA = grma,
               ◇ SANS_GROUP_MA = Grma,
               ◇ SANS_GROUP_NO = big,
               ◆ ANGL_NAUT = float,
               ◆ | DX = float,
                 | DY = float,
                 | DZ = float,
                 | DRX = float,
                 | DRY = float,
                 | DRZ = float,
            ),
          | GROUP_LINK = _F (
               ◆/GROUP_MA_1 = grma,
                 /GROUP_NO_1 = grno,
               ◆/GROUP_NO_2 = grno,
                 /GROUP_MA_2 = grma,
               ◇ SANS_GROUP_NO = big,
               ◆ DDL_1 =/"DX",
                         /"DY",
                         /"DZ",
                         /"DRX ",
                         /"DRY ",
                         /"DRZ ",
                         /"PRES ",
                         /"PHI ",
                         /"GONF ",
                         /"TEMP ",
                         /"PRE1 ",
                         /"PRE2 ",
                         /"GRX ",
                         /"DRGX ",
                         /"DRGY ",
                         /"DRGZ ",
                         /"PSI ",
                         /"UI2 ",
                         /"UI3 ",
                         /"VI2 ",
                         /"VI3 ",
                         /"WI2 ",
                         /"WI3 ",
                         /"UO2 ",
                         /"UO3 ",
                         /"VO2 ",
                         /"VO3 ",
                         /"WO2 ",
                         /"WO3 ",
                         /"UI4 ",
                         /"UI5 ",
                         /"VI4 ",
                         /"VI5 ",
                         /"WI4 ",
                         /"WI5 ",
                         /"UO4 ",
                         /"UO5 ",
                         /"VO4 ",
                         /"VO5 ",
                         /"WO4 ",
                         /"WO5 ",
                         /"UI6 ",
                         /"UO6 ",
                         /"VI6 ",
                         /"VO6 ",
                         /"WI6 ",
                         /"WO6 ",
                         /"WO",
                         /"WI1 ",
                         /"WO1 ",
                         /"H1X",
                         /"H1Y",
                         /"H1Z",
                         /"H 1PRE1 ",
                         /"K1",
                         /"K2",
                         /"K3",
                         /"V11",
                         /"V12",
                         /"V13",
                         /"V21",
                         /"V22",
                         /"V23",
                         /"V31",
                         /"V32",
                         /"V33",
                         /"PRES11 ",
                         /"PRES12 ",
                         /"PRES13 ",
                         /"PRES21 ",
                         /"PRES22 ",
                         /"PRES23 ",
                         /"PRES31 ",
                         /"PRES32 ",
                         /"PRES33 ",
                         /"LH1 ",
                         /"GLIS ",
                         /"DNOR ",
               ◆ COEF_MULT_1 = float,
               ◆ DDL_2 =/"DX",
                         /"DY",
                         /"DZ",
                         /"DRX ",
                         /"DRY ",
                         /"DRZ ",
                         /"PRES ",
                         /"PHI ",
                         /"GONF ",
                         /"TEMP ",
                         /"PRE1 ",
                         /"PRE2 ",
                         /"GRX ",
                         /"DRGX ",
                         /"DRGY ",
                         /"DRGZ ",
                         /"PSI ",
                         /"UI2 ",
                         /"UI3 ",
                         /"VI2 ",
                         /"VI3 ",
                         /"WI2 ",
                         /"WI3 ",
                         /"UO2 ",
                         /"UO3 ",
                         /"VO2 ",
                         /"VO3 ",
                         /"WO2 ",
                         /"WO3 ",
                         /"UI4 ",
                         /"UI5 ",
                         /"VI4 ",
                         /"VI5 ",
                         /"WI4 ",
                         /"WI5 ",
                         /"UO4 ",
                         /"UO5 ",
                         /"VO4 ",
                         /"VO5 ",
                         /"WO4 ",
                         /"WO5 ",
                         /"UI6 ",
                         /"UO6 ",
                         /"VI6 ",
                         /"VO6 ",
                         /"WI6 ",
                         /"WO6 ",
                         /"WO",
                         /"WI1 ",
                         /"WO1 ",
                         /"H1X",
                         /"H1Y",
                         /"H1Z",
                         /"H 1PRE1 ",
                         /"K1",
                         /"K2",
                         /"K3",
                         /"V11",
                         /"V12",
                         /"V13",
                         /"V21",
                         /"V22",
                         /"V23",
                         /"V31",
                         /"V32",
                         /"V33",
                         /"PRES11 ",
                         /"PRES12 ",
                         /"PRES13 ",
                         /"PRES21 ",
                         /"PRES22 ",
                         /"PRES23 ",
                         /"PRES31 ",
                         /"PRES32 ",
                         /"PRES33 ",
                         /"LH1 ",
                         /"GLIS ",
                         /"DNOR ",
               ◆ COEF_MULT_2 = float,
               ◆ COEF_IMPO = float,
               ◇ TRAN = float,
               ◇ ANGL_NAUT = float,
               ◇ CENTRE = float,
            ),
          | MAIL_LINK = _F (
               ◇ GROUP_MA_MAIT = Grma,
               ◆ | GROUP_MA_ESCL = grma,
                 | GROUP_NO_ESCL = grno,
               ◇ DISTANCE_MAX = float,
               ◇ DISTANCE_ALARME = float,
               ◇ TYPE_RACCORD =/"MASSIF" (by default),
                                /"COQUE ",
                                /"COQUE_MASSIF ",
                                /"MASSIF_COQUE ",
               # If: equal_to (" TYPE_RACCORD ", 'COQUE')
                   ◇ TRANSF_GEOM_MAIT = function/formula/table cloth,
                   ◇ TRANSF_GEOM_ESCL = function/formula/table cloth,
                   ◇ DDL =/"DX",
                           /"DY",
                           /"DZ",
                           /"DRX ",
                           /"DRY ",
                           /"DRZ ",
               # If: equal_to (" TYPE_RACCORD ", 'MASSIF')
                   ◇ TRAN = float,
                   ◇ ANGL_NAUT = float,
                   ◇ CENTRE = float,
                   ◇ DDL =/"DX",
                           /"DY",
                           /"DZ",
                           /"DRX ",
                           /"DRY ",
                           /"DRZ ",
                           /"PRES ",
                           /"PHI ",
                           /"GONF ",
                           /"TEMP ",
                           /"PRE1 ",
                           /"PRE2 ",
                           /"GRX ",
                           /"DRGX ",
                           /"DRGY ",
                           /"DRGZ ",
                           /"PSI ",
                           /"UI2 ",
                           /"UI3 ",
                           /"VI2 ",
                           /"VI3 ",
                           /"WI2 ",
                           /"WI3 ",
                           /"UO2 ",
                           /"UO3 ",
                           /"VO2 ",
                           /"VO3 ",
                           /"WO2 ",
                           /"WO3 ",
                           /"UI4 ",
                           /"UI5 ",
                           /"VI4 ",
                           /"VI5 ",
                           /"WI4 ",
                           /"WI5 ",
                           /"UO4 ",
                           /"UO5 ",
                           /"VO4 ",
                           /"VO5 ",
                           /"WO4 ",
                           /"WO5 ",
                           /"UI6 ",
                           /"UO6 ",
                           /"VI6 ",
                           /"VO6 ",
                           /"WI6 ",
                           /"WO6 ",
                           /"WO",
                           /"WI1 ",
                           /"WO1 ",
                           /"H1X",
                           /"H1Y",
                           /"H1Z",
                           /"H 1PRE1 ",
                           /"K1",
                           /"K2",
                           /"K3",
                           /"V11",
                           /"V12",
                           /"V13",
                           /"V21",
                           /"V22",
                           /"V23",
                           /"V31",
                           /"V32",
                           /"V33",
                           /"PRES11 ",
                           /"PRES12 ",
                           /"PRES13 ",
                           /"PRES21 ",
                           /"PRES22 ",
                           /"PRES23 ",
                           /"PRES31 ",
                           /"PRES32 ",
                           /"PRES33 ",
                           /"LH1 ",
                           /"GLIS ",
                           /"DNOR ",
               # If: equal_to (" TYPE_RACCORD ", 'COQUE_MASSIF')
                   ◆ EPAIS = float,
                   ◆ CHAM_NORMALE = cham_no,
               ◇ ELIM_MULT =/"OUI" (by default),
                             /"NON ",
            ),
          | CYCL_LINK = _F (
               ◇ GROUP_MA_MAIT1 = Grma,
               ◇ GROUP_MA_MAIT2 = Grma,
               ◆ | GROUP_MA_ESCL = grma,
                 | GROUP_NO_ESCL = grno,
               ◇ TRAN = float,
               ◇ ANGL_NAUT = float,
               ◇ CENTRE = float,
               ◇ COEF_MAIT1 = float,
               ◇ COEF_MAIT2 = float,
               ◇ COEF_ESCL = float,
               ◇ & DDL_MAIT = "DNOR" (or not specified),
                 & DDL_ESCL = "DNOR" (or not specified),
            ),
          | SOLID_BOND = _F (
               ◆/GROUP_NO = grno,
                 /GROUP_MA = grma,
               ◇ SANS_GROUP_MA = Grma,
               ◇ SANS_GROUP_NO = big,
               ◇ DIST_MIN = float,
            ),
          | ELEM_LINK = _F (
               ◆ OPTION =/"3D_TUYAU ",
                          /"3D_POU ",
                          /"3D_POU_ARLEQUIN ",
                          /"2D_POU ",
                          /"COQ_POU ",
                          /"COQ_TUYAU ",
                          /"PLAQ_POUT_ORTH ",
               # If: equal_to (" OPTION ", '3D_POU')
                   ◇ GROUP_MA_1 = Grma,
                   ◆/GROUP_NO_2 = grno,
                     /GROUP_MA_2 = grma,
                   ◇ ANGL_MAX = float (default: 1.0),
               # If: equal_to (" OPTION ", '3D_POU_ARLEQUIN')
                   ◇ GROUP_MA_1 = Grma,
                   ◇ GROUP_MA_2 = Grma,
                   ◆ CARA_ELEM = cara_elem,
                   ◆ CHAM_MATER = cham_master,
               # If: equal_to (" OPTION ", '2D_POU')
                   ◇ GROUP_MA_1 = Grma,
                   ◆/GROUP_NO_2 = grno,
                     /GROUP_MA_2 = grma,
               # If: equal_to (" OPTION ", 'COQ_POU') or equal_to (" OPTION ", 'COQ_TUYAU')
                   ◇ GROUP_MA_1 = Grma,
                   ◇ GROUP_NO_2 = big,
                   ◆ CARA_ELEM = cara_elem,
                   ◆ AXE_POUTRE = float,
               # If: equal_to (" OPTION ", '3D_TUYAU')
                   ◇ GROUP_MA_1 = Grma,
                   ◇ GROUP_NO_2 = big,
                   ◆ CARA_ELEM = cara_elem,
                   ◆ AXE_POUTRE = float,
                   ◇ ANGL_MAX = float (default: 1.0),
               # If: equal_to (" OPTION ", 'PLAQ_POUT_ORTH')
                   ◇ GROUP_MA_1 = Grma,
                   ◇ GROUP_NO_2 = big,
                   ◇ ANGL_MAX = float (default: 1.0),
                   ◇ VERIF_EXCENT =/"OUI" (by default),
                                    /"NON ",
            ),
          | UNIF_LINK = _F (
               ◆/GROUP_NO = grno,
                 /GROUP_MA = grma,
               ◇ SANS_GROUP_MA = Grma,
               ◇ SANS_GROUP_NO = big,
               ◆ DDL =/"DX",
                       /"DY",
                       /"DZ",
                       /"DRX ",
                       /"DRY ",
                       /"DRZ ",
                       /"PRES ",
                       /"PHI ",
                       /"GONF ",
                       /"TEMP ",
                       /"PRE1 ",
                       /"PRE2 ",
                       /"GRX ",
                       /"DRGX ",
                       /"DRGY ",
                       /"DRGZ ",
                       /"PSI ",
                       /"UI2 ",
                       /"UI3 ",
                       /"VI2 ",
                       /"VI3 ",
                       /"WI2 ",
                       /"WI3 ",
                       /"UO2 ",
                       /"UO3 ",
                       /"VO2 ",
                       /"VO3 ",
                       /"WO2 ",
                       /"WO3 ",
                       /"UI4 ",
                       /"UI5 ",
                       /"VI4 ",
                       /"VI5 ",
                       /"WI4 ",
                       /"WI5 ",
                       /"UO4 ",
                       /"UO5 ",
                       /"VO4 ",
                       /"VO5 ",
                       /"WO4 ",
                       /"WO5 ",
                       /"UI6 ",
                       /"UO6 ",
                       /"VI6 ",
                       /"VO6 ",
                       /"WI6 ",
                       /"WO6 ",
                       /"WO",
                       /"WI1 ",
                       /"WO1 ",
                       /"H1X",
                       /"H1Y",
                       /"H1Z",
                       /"H 1PRE1 ",
                       /"K1",
                       /"K2",
                       /"K3",
                       /"V11",
                       /"V12",
                       /"V13",
                       /"V21",
                       /"V22",
                       /"V23",
                       /"V31",
                       /"V32",
                       /"V33",
                       /"PRES11 ",
                       /"PRES12 ",
                       /"PRES13 ",
                       /"PRES21 ",
                       /"PRES22 ",
                       /"PRES23 ",
                       /"PRES31 ",
                       /"PRES32 ",
                       /"PRES33 ",
                       /"LH1 ",
                       /"GLIS ",
            ),
          | FIELD_LINK = _F (
               ◆ CHAM_NO = cham_no,
               ◆ COEF_IMPO = float,
            ),
          | LINK_RBE3 = _F (
               ◇ GROUP_NO_MAIT = big,
               ◆ DDL_MAIT =/"DX",
                            /"DY",
                            /"DZ",
                            /"DRX ",
                            /"DRY ",
                            /"DRZ ",
               ◇ GROUP_NO_ESCL = big,
               ◆ DDL_ESCL = text,
               ◇ COEF_ESCL = float (default: 1.0),
            ),
          | INTERF_LINK = _F (
               ◆ MACR_ELEM_DYNA = macr_elem_dyna,
               ◇ TYPE_LIAISON =/"RIGIDE" (by default),
                                /"SOUPLE ",
            ),
          | PROJ_LINK = _F (
               ◆ MATR_PROJECTION = corresp_2_mailla,
               ◆ DDL =/"DX",
                       /"DY",
                       /"DZ",
                       /"DRX ",
                       /"DRY ",
                       /"DRZ ",
                       /"PRES ",
                       /"PHI ",
                       /"GONF ",
                       /"TEMP ",
                       /"PRE1 ",
                       /"PRE2 ",
                       /"GRX ",
                       /"DRGX ",
                       /"DRGY ",
                       /"DRGZ ",
                       /"PSI ",
                       /"UI2 ",
                       /"UI3 ",
                       /"VI2 ",
                       /"VI3 ",
                       /"WI2 ",
                       /"WI3 ",
                       /"UO2 ",
                       /"UO3 ",
                       /"VO2 ",
                       /"VO3 ",
                       /"WO2 ",
                       /"WO3 ",
                       /"UI4 ",
                       /"UI5 ",
                       /"VI4 ",
                       /"VI5 ",
                       /"WI4 ",
                       /"WI5 ",
                       /"UO4 ",
                       /"UO5 ",
                       /"VO4 ",
                       /"VO5 ",
                       /"WO4 ",
                       /"WO5 ",
                       /"UI6 ",
                       /"UO6 ",
                       /"VI6 ",
                       /"VO6 ",
                       /"WI6 ",
                       /"WO6 ",
                       /"WO",
                       /"WI1 ",
                       /"WO1 ",
                       /"H1X",
                       /"H1Y",
                       /"H1Z",
                       /"H 1PRE1 ",
                       /"K1",
                       /"K2",
                       /"K3",
                       /"V11",
                       /"V12",
                       /"V13",
                       /"V21",
                       /"V22",
                       /"V23",
                       /"V31",
                       /"V32",
                       /"V33",
                       /"PRES11 ",
                       /"PRES12 ",
                       /"PRES13 ",
                       /"PRES21 ",
                       /"PRES22 ",
                       /"PRES23 ",
                       /"PRES31 ",
                       /"PRES32 ",
                       /"PRES33 ",
                       /"LH1 ",
                       /"GLIS ",
               ◇ TYPE =/"IDENTITE" (by default),
                        /"EXCENTREMENT ",
            ),
          | VECT_ASSE = fiel_no,
          | NODAL_FORCE = _F (
               ◆/GROUP_NO = grno,
               ◆ | FX = float,
                 | FY = float,
                 | FZ = float,
                 | MX = float,
                 | MY = float,
                 | MZ = float,
               ◇ ANGL_NAUT = float,
            ),
          | FORCE_FACE = _F (
               ◇ GROUP_MA = Grma,
               ◆ | FX = float,
                 | FY = float,
                 | FZ = float,
            ),
          | FORCE_ARETE = _F (
               ◇ GROUP_MA = Grma,
               ◆ | FX = float,
                 | FY = float,
                 | FZ = float,
                 | MX = float,
                 | MY = float,
                 | MZ = float,
            ),
          | CONTOUR_STRENGTH = _F (
               ◇ GROUP_MA = Grma,
               ◆ | FX = float,
                 | FY = float,
                 | FZ = float,
            ),
          | INTERNAL_FORCE = _F (
               ◆/TOUT = "OUI" (or not specified),
                 /GROUP_MA = grma,
               ◆ | FX = float,
                 | FY = float,
                 | FZ = float,
            ),
          | PRE_SIGM = _F (
               ◆ SIGM = cham_elem/card,
            ),
          | PRES_REP = _F (
               ◆ | ALL = "YES" (or not specified),
                 | GROUP_MA = grma,
                 | CRACK = fiss_xfem,
               ◆ | PRES = float,
                 | CISA_2D = float,
            ),
          | BACKGROUND_EFFECT = _F (
               ◆ GROUP_MA_INT = GRMA,
               ◇ GROUP_MA = Grma,
               ◆ PRES = float,
            ),
          | PRE_EPSI = _F (
               ◆ | ALL = "YES" (or not specified),
                 | GROUP_MA = grma,
                 | EPSI = cham_elem/map,
               ◆ | EPXX = float,
                 | EPYY = float,
                 | EPZZ = float,
                 | EPXY = float,
                 | EPXZ = float,
                 | EPYZ = float,
                 | EPX = float,
                 | KY = float,
                 | KZ = float,
                 | EXX = float,
                 | EYY = float,
                 | EXY = float,
                 | KXX = float,
                 | KYY = float,
                 | KXY = float,
            ),
          | BEAM_STRENGTH = _F (
               ◆/TOUT = "OUI" (or not specified),
                 /GROUP_MA = grma,
               ◇ TYPE_CHARGE =/"VENT ",
                               /"FORCE" (by default),
               # If: equal_to (" TYPE_CHARGE ", 'FORCE')
                   ◆ | FX = float,
                     | FY = float,
                     | FZ = float,
                     | MX = float,
                     | MY = float,
                     | MZ = float,
                     | N = float,
                     | VY = float,
                     | VZ = float,
                     | MT = float,
                     | MFY = float,
                     | MFZ = float,
                     | MGX = float,
                     | MGY = float,
                     | MGZ = float,
               # If: equal_to (" TYPE_CHARGE ", 'VENT')
                   ◆ | FX = function/formula/table cloth,
                     | FY = function/formula/table,
                     | FZ = function/formula/table,
                     | N = function/formula/table,
                     | VY = function/formula/table,
                     | VZ = function/formula/table,
            ),
          | FORCE_PIPE = _F (
               ◆/TOUT = "OUI" (or not specified),
                 /GROUP_MA = grma,
               ◆ PRES = float,
            ),
          | SHELL_FORCE = _F (
               ◆/TOUT = "OUI" (or not specified),
                 /GROUP_MA = grma,
               ◆ | FX = float,
                 | FY = float,
                 | FZ = float,
                 | MX = float,
                 | MY = float,
                 | MZ = float,
                 | PRES = float,
                 | F1 = float,
                 | F2 = float,
                 | F3 = float,
                 | MF1 = float,
                 | MF2 = float,
               ◇ PLAN =/"SUP ",
                        /"INF ",
                        /"MOY ",
                        /"MAIL" (by default),
            ),
          | FORCE_COQUE_FO = _F (
               ◆/TOUT = "OUI" (or not specified),
                 /GROUP_MA = grma,
               ◇ PRES = function/formula/table cloth,
            ),
          | SHELL_LINK = _F (
               ◆ | GROUP_MA_1 = GRMA,
                 | GROUP_MA_2 = grma,
                 | GROUP_NO_1 = group,
                 | GROUP_NO_2 = group,
               ◇ SANS_GROUP_MA_1 = Grma,
               ◇ SANS_GROUP_NO_1 = big,
               ◇ SANS_GROUP_MA_2 = Grma,
               ◇ SANS_GROUP_NO_2 = big,
            ),
          | RELA_CINE_BP = _F (
               ◆ CABLE_BP = cabl_precont,
               ◇ RELA_CINE =/"OUI" (by default),
                             /"NON ",
               # If: equal_to (" RELA_CINE ", 'OUI')
                   ◇ SIGM_BPEL =/"OUI ",
                                 /"NON" (by default),
               # If: equal_to (" RELA_CINE ", 'NON')
                   ◇ SIGM_BPEL = "OUI ",
               ◇ TYPE_EPX =/"ADHE" (by default),
                            /"GLIS ",
                            /"FROT ",
               ◇ DIST_MIN = float,
            ),
          | FORCE_ELEC = _F (
               ◆/TOUT = "OUI" (or not specified),
                 /GROUP_MA = grma,
               ◇ POSITION =/"PARA ",
                            /"INFI ",
                            /"FINI ",
               # If: not exists (" POSITION ")
                   ◇ FX = float,
                   ◇ FY = float,
                   ◇ FZ = float,
               # If: equal_to (" POSITION ", 'PARA')
                   ◆/TRANS = float,
                     /DIST = float,
                   # If: exists (" DIST ")
                       ◆ POINT2 = float,
               # If: (equal_to (" POSITION ", '",' FINI ')) or (equal_to (" POSITION ",' INFI '))
                   ◆ POINT1 = float,
                   ◆ POINT2 = float,
            ),
          | SPEED_FACE = _F (
               ◇ GROUP_MA = Grma,
               ◆/VNOR = float,
                 /DIRECTION = float,
               # If: exists (" DIRECTION ")
                   ◆ VITE = float,
            ),
          | WAVE_FLUI = _F (
               ◇ GROUP_MA = Grma,
               ◆ PRES = float,
            ),
          | THM_REP FLOW = _F (
               ◆/TOUT = "OUI" (or not specified),
                 /GROUP_MA = grma,
               ◆ | FLUN = float,
                 | FLUN_HYDR1 = float,
                 | FLUN_HYDR2 = float,
            ),
          | SOL_FORCE = _F (
               ◆/GROUP_NO_INTERF = grno,
                 /SUPER_MAILLE = my,
               ◆ | UNITE_RESU_MASS = unit,
                 | UNITE_RESU_RIGI = unit,
                 | UNITE_RESU_AMOR = unit,
               ◇ UNITE_RESU_FORC = unit,
               ◇ NB_PAS_TRONCATURE = int,
               ◇ TYPE =/"BINAIRE ",
                        /"ASCII" (by default),
            ),
          | EXCHANGE_THM = _F (
               ◆/TOUT = "OUI" (or not specified),
                 /GROUP_MA = grma,
               ◆ | COEF_11 = float,
                 | COEF_12 = float,
                 | COEF_21 = float,
                 | COEF_22 = float,
               ◆ PRE1_EXT = float,
               ◇ PRE2_EXT = float,
            ),
        ◇ DOUBLE_LAGRANGE =/"OUI" (by default),
                            /"NON ",
        ◇ INFO =/1 (by default),
                 /2,
    )

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