1		% (c) 2009-2025 Lehrstuhl fuer Softwaretechnik und Programmiersprachen,
2		% Heinrich Heine Universitaet Duesseldorf
3		% This software is licenced under EPL 1.0 (http://www.eclipse.org/org/documents/epl-v10.html)
4
5		:- module(xtl_interface, [open_xtl_file/1,
6		xtl_transition/3, xtl_transition/4,
7		xtl_transition_with_symbolic/3,
8		xtl_symbolic_transition_potentially_enabled/2,
9		xtl_transition_parameters/2, get_xtl_paras_as_identifiers/2,
10		xtl_property/2, xtl_invariant_violated/1,
11		xtl_nr_state_properties/1,
12		xtl_goal_found/1,
13		xtl_animation_function_result/2, xtl_animation_image/2,
14		xtl_heuristic_function_active/0,
15		xtl_heuristic_function_result/2,
16		xtl_animation_image_click_transition/6,
17		xtl_animation_image_right_click_transition/4,
18		xtl_get_definition_string/2,
19		xtl_game_info/3,
20
21		xtl_search_scope/1, xtl_set_search_scope/1,
22		xtl_main_file_name/1,
23
24		csp_initialisation_for_b/1,
25		csp_transition_for_b/5,
26		generate_b_operationargs_from_csp/2,
27
28		%open_promela_file/1, promela_transition/3, promela_property/2,
29		%open_smv_file/1, smv_transition/3, smv_property/2, % SMV mode broken
30
31		open_cspm_file/1, last_opened_cspm_file/1,
32		cspm_transition/3,
33		cspm_property/2,
34		set_cspm_main_process/1,
35		reset_xtl_interface/0]).
36
37
38		:- use_module(module_information).
39		:- module_info(group,animator).
40		:- module_info(description,'Provides an interface to the non-B animators depending on animation-mode.').
41
42		/* Typically the XTL specifications reside in a .P file with the following predicates
43		start/1 -> defining the initial states
44		trans/3 -> defining the transitions between states transition(Action, StateBefore, StateAfter)
45		prop/2 -> defining properties of states
46
47		start/2, trans/4: same as start/1 and trans/3, but last argument allows to provide a list of
48		additional transition infos (stored in state_space), e.g. [description('Desc')]
49
50		For CSP specifications the interpreter is integrated into ProB
51
52		*/
53
54		/* --------------- XTL ----------------- */
55		:- volatile prop/2, trans/3, trans/4, trans_prop/2, start/1, start/2, symb_trans/3, symb_trans_enabled/2.
56		:- volatile nr_state_properties/1, animation_function_result/2, animation_image/2.
57		:- volatile animation_image_click_transition/6, animation_image_right_click_transition/3.
58		:- volatile animation_image_right_click_transition/4.
59		:- volatile heuristic_function_active/0, heuristic_function_result/2.
60		:- volatile prob_pragma_string/2, prob_game_info/3.
61		:- volatile xtl_search_scope/1, xtl_main_file_name/1.
62		:- dynamic prop/2.
63		:- dynamic trans/3, trans/4.
64		:- dynamic trans_prop/2.
65		:- dynamic symb_trans/3, symb_trans_enabled/2.
66		:- dynamic start/1, start/2.
67		:- dynamic nr_state_properties/1.
68		:- dynamic animation_function_result/2.
69		:- dynamic animation_image/2.
70		:- dynamic animation_image_click_transition/6, animation_image_right_click_transition/3.
71		:- dynamic animation_image_right_click_transition/4.
72		:- dynamic heuristic_function_active/0.
73		:- dynamic heuristic_function_result/2.
74		:- dynamic prob_pragma_string/2, prob_game_info/3.
75		:- dynamic xtl_search_scope/1, xtl_main_file_name/1.
76
77
78		% the following imports are required so that XTL .P files can make use of these functions:
79		:- use_module(library(lists)).
80		:- use_module(library(between)).
81		:- use_module(library(ordsets)).
82		:- use_module(library(samsort)).
83		:- use_module(library(random)).
84		:- use_module(library(avl)).
85		:- use_module(library(heaps)).
86		:- use_module(tools_portability, [exists_source/1]).
87		:- if(exists_source(library(logarr))).
88		:- use_module(library(logarr)). % not yet available in SWI Prolog
89		:- endif.
90
91		% ProB utilities (which can also be used by XTL code)
92		:- use_module(error_manager).
93		:- use_module(preferences,[get_preference/2]).
94		:- use_module(debug).
95		:- use_module(tools).
96
97		:- if(\+ current_prolog_flag(dialect, sicstus)).
98		abolish_all([]).
99		abolish_all([Pred|Preds]) :-
100		abolish(Pred),
101		abolish_all(Preds).
102		:- else.
103		abolish_all(Preds) :-
104		abolish(Preds, [force(true),tree(true)]).
105		:- endif.
106
107		open_xtl_file(File) :-
108		abolish_all([prop/2, trans/3, trans/4, trans_prop/2, symb_trans/3, symb_trans_enabled/2, start/1, start/2, nr_state_properties/1]),
109		abolish_all([animation_image/2,animation_function_result/2,
110		animation_image_click_transition/6,animation_image_right_click_transition/3,
111		animation_image_right_click_transition/4,
112		heuristic_function_active/0,
113		prob_pragma_string/2,
114		prob_game_info/3]),
115		abolish_all([xtl_search_scope/1, xtl_main_file_name/1]),
116		assertz((prop(_,_) :- fail)),
117		assertz((trans(_,_,_) :- fail)),
118		assertz((trans(_,_,_,_) :- fail)),
119		assertz((trans_prop(_,_) :- fail)),
120		assertz((symb_trans(_,_,_) :- fail)),
121		assertz((symb_trans_enabled(_,_) :- fail)),
122		assertz((start(_) :- fail)),
123		assertz((start(_,_) :- fail)),
124		assertz((nr_state_properties(_) :- fail)),
125		assertz((heuristic_function_active :- fail)),
126		assertz((animation_image(_,_) :- fail)),
127		assertz((animation_function_result(_,_) :- fail)),
128		assertz((animation_image_click_transition(_,_,_,_,_,_) :- fail)),
129		assertz((animation_image_right_click_transition(_,_,_) :- fail)),
130		assertz((animation_image_right_click_transition(_,_,_,_) :- fail)),
131		assertz((prob_pragma_string(_,_) :- fail)),
132		assertz((prob_game_info(_,_,_) :- fail)),
133		assertz((xtl_search_scope(_) :- fail)),
134		assertz(xtl_main_file_name(File)),
135
136		debug_println(9,tcltk_open_xtl_file(File)),
137		consult_without_redefine_warning(File),
138		debug_println(9,new_xtl_file(File)),
139		(xtl_get_definition_string('SCOPE',ScopePredStr) -> xtl_set_search_scope(ScopePredStr) ; true).
140
141		xtl_transition(State,Operation,NewState) :-
142		xtl_transition(State,Operation,NewState,_).
143		xtl_transition(State,Operation,NewState,Infos) :-
144		(get_preference(xtl_safe_mode, true)
145		-> xtl_transition_safe(State,Operation,NewState,Infos)
146		; xtl_transition_unsafe(State,Operation,NewState,Infos)).
147		xtl_transition_unsafe(root,start_xtl_system,NewState,Infos) :- get_start(NewState,Infos).
148		xtl_transition_unsafe(State,Operation,NewState,Infos) :-
149		State \= root, get_trans(Operation,State,NewState,Infos).
150		xtl_transition_safe(State,Operation,NewState,Infos) :-
151		(ground(State) -> true ; add_error(xtl,'Non-ground XTL state:',State),fail),
152		(State=root
153		-> Operation=start_xtl_system, get_start(NewState,Infos)
154		; get_trans(Operation,State,NewState,Infos),
155		((atom(Operation) ; compound(Operation)) -> true ; add_error(xtl,'Illegal XTL operation:',Operation),fail),
156		(ground(Operation) -> true ; add_error(xtl,'Non-ground XTL operation:',Operation),fail)
157		),
158		(ground(NewState) -> true ; add_error(xtl,'Non-ground XTL destination state:',NewState), fail).
159
160		xtl_transition_with_symbolic(State,Operation,NewState) :-
161		ground(Operation),
162		symb_trans(Operation,State,NewState), !,
163		check_trans_params(Operation).
164		xtl_transition_with_symbolic(State,Operation,NewState) :-
165		xtl_transition(State,Operation,NewState).
166
167		get_start(State,[]) :- start(State).
168		get_start(State,Infos) :- start(State,Infos),
169		(is_list(Infos) -> true ; add_error(xtl,'Transition info is not a list:',Infos), fail).
170		get_start(_,_) :- \+ start(_), \+start(_,_), add_error(xtl,'No XTL start state defined'), fail.
171
172		get_trans(Operation,State,NewState,[]) :- trans(Operation,State,NewState), check_trans_params(Operation).
173		get_trans(Operation,State,NewState,Infos) :- trans(Operation,State,NewState,Infos),
174		(is_list(Infos) -> true ; add_error(xtl,'Transition info is not a list:',Infos), fail),
175		check_trans_params(Operation).
176
177		% check that number of specified parameters matches the arity of the transition term and
178		% that only one declaration of parameter names per name is provided
179		check_trans_params(_) :- \+ trans_prop(_,param_names(_)), !.
180		check_trans_params(OpTerm) :-
181		functor(OpTerm,Name,Ar),
182		(xtl_transition_parameters(Name,Paras)
183		-> length(Paras,NrP),
184		(Ar =:= NrP -> true ; add_error(xtl,'Number of specified parameter names does not match the arity of transition:',Name),fail)
185		; true). % no params
186
187		xtl_transition_parameters(TransName,ParaNames) :-
188		trans_prop(TransName,param_names(ParaNames)),
189		(trans_prop(TransName,param_names(P2)), P2\=ParaNames
190		-> add_error(xtl,'Multiple parameter declarations for transition name:',TransName), fail
191		; true).
192
193		get_xtl_paras_as_identifiers(OpName,ParaIds) :-
194		xtl_transition_parameters(OpName,ParaNames), !,
195		findall(b(identifier(Name),string,[]), member(Name,ParaNames), ParaIds).
196		get_xtl_paras_as_identifiers(_,[]).
197
198		xtl_symbolic_transition_potentially_enabled(TransName,State) :-
199		symb_trans_enabled(TransName,State).
200
201		xtl_property(State,Property) :-
202		(get_preference(xtl_safe_mode, true) -> xtl_property_safe(State,Property) ; xtl_property_unsafe(State,Property)).
203		xtl_property_unsafe(State,Property) :-
204		State \= root, get_prop(State,Property).
205		xtl_property_safe(State,Property) :-
206		State \= root,
207		get_prop(State,Property),
208		(ground(Property)-> true ; add_error(xtl,'Non-ground XTL property:',Property), fail).
209
210		get_prop(State,Property) :- if(prop(State,Property), true, Property='No XTL properties defined').
211
212		% special Property is unsafe; see is_xtl_error_state in model_checker.pl
213		% Note for XTL we do not use not_invariant_checked/1 facts
214		xtl_invariant_violated(State) :- xtl_property(State,unsafe).
215		xtl_goal_found(State) :- xtl_property(State,goal).
216
217		xtl_nr_state_properties(Nr) :- nr_state_properties(Nr).
218
219		xtl_animation_function_result(State,AnimationMatrix) :- State \= root,
220		animation_function_result(State,AnimationMatrix).
221
222		xtl_animation_image(Nr,PathToGif) :-
223		%on_exception(error(existence_error(_,_),_),
224		animation_image(Nr,PathToGif).
225
226		% return a transition template to execute for simple clicks (From=To) or drags
227		% OperationTemplate can either be the template of an operation to match or a list of such templates
228		% (the operations will then be executed in order)
229		xtl_animation_image_click_transition(FromX,FromY,ToX,ToY,OperationTemplate,Image) :-
230		animation_image_click_transition(FromX,FromY,ToX,ToY,OperationTemplate,Image).
231
232		xtl_animation_image_right_click_transition(X,Y,OperationTemplate,State) :-
233		animation_image_right_click_transition(X,Y,OperationTemplate,State).
234		xtl_animation_image_right_click_transition(X,Y,OperationTemplate,_) :-
235		animation_image_right_click_transition(X,Y,OperationTemplate).
236
237		xtl_heuristic_function_active :-
238		heuristic_function_active.
239		xtl_heuristic_function_result(State,int(IntegerVal)) :- State \= root,
240		heuristic_function_result(State,Res),
241		(Res=int(R) -> IntegerVal=R
242		; number(Res) -> IntegerVal=Res
243		; add_error(xtl_heuristic_function_result,'heuristic_function_result must be integer: ',Res),fail
244		).
245
246		xtl_game_info(Key,State,Value) :- prob_game_info(Key,State,Value).
247		%xtl_game_over(State) :- prob_game_info('GAME_OVER',State,true).
248		%xtl_game_value(State,Value) :- prob_game_info('GAME_VALUE',State,Value).
249		%xtl_game_player(State,Player) :- prob_game_info('GAME_PLAYER',State,Player).
250
251
252		% way to mimic DEFINITION Strings in XTL mode, such as ASSERT_LTL
253		xtl_get_definition_string(Def_Name,DefString) :-
254		prob_pragma_string(N,S),
255		get_atom_string(N,Def_Name),
256		get_atom_string(S,DefString).
257
258		:- use_module(tools,[safe_atom_codes/2]).
259		get_atom_string(Atom,Res) :- atom(Atom),!,Res=Atom.
260		get_atom_string([H|T],Res) :- safe_atom_codes(Atom,[H|T]), !, Res=Atom. % transform "abc" into 'abc'
261		get_atom_string(R,R).
262
263		% set search_scope, restricting model checking to states which satisfy the SCOPE DEFINITION predicate
264		xtl_set_search_scope(Goal) :-
265		(predicate_property(xtl_search_scope(_),dynamic) % can be static if it is defined by the XTL spec
266		-> bmachine:b_parse_machine_predicate(Goal,[prob_ids(visible),variables,external_library(all_available_libraries)],TypedPred),
267		retractall(xtl_search_scope(_)),
268		assertz(xtl_search_scope(TypedPred))
269		; add_warning(xtl_set_search_scope,'Failed to set XTL search scope (xtl_search_scope is already defined): ',Goal)).
270
271		consult_without_redefine_warning(File) :-
272		get_set_optional_prolog_flag(redefine_warnings, Old, off),
273		get_set_optional_prolog_flag(single_var_warnings, Old2, off),
274		(catch(my_compile(File),
275		error(existence_error(_,_),_),
276		add_error_fail(xtl,'XTL File does not exist:',File))
277		-> OK=true ; OK=false),
278		get_set_optional_prolog_flag(redefine_warnings, _, Old),
279		get_set_optional_prolog_flag(single_var_warnings, _, Old2),
280		OK=true.
281
282		my_compile(F) :- %get_preference(user_is_an_expert_with_accessto_source_distribution,true),
283		!, % it seems it is ok to call compile also in probcli binary; it may do consult though
284		compile(F).
285		my_compile(F) :- consult(F).
286
287
288		/* --------------- Promela ----------------- */
289
290		%:- use_module('promela/h_int').
291
292		/* --------------- SMV ----------------- */
293
294		% :- use_module('smv/smv_trans').
295
296
297		/* --------------- CSP-M ----------------- */
298
299		:- use_module(probcspsrc(haskell_csp),[parse_and_load_cspm_file/1,
300		cspm_trans_enum/3,
301		animatable_process/1, animatable_process_without_arguments/1,
302		get_symbol_span/2,force_evaluate_argument/2,normalise_cspm_state/2]).
303		:- use_module(probcspsrc(haskell_csp_analyzer),[cspPrintCompiled/2]).
304		:- use_module(probsrc(translate),[translate_cspm_state/2]).
305
306		:- dynamic last_opened_cspm_file/1. % useful for csp_and_b mode
307
308		open_cspm_file(File) :-
309		retractall(last_opened_cspm_file(_)),
310		debug_println(15,open_cspm_file(File)), flush_output(user_output),
311		parse_and_load_cspm_file(File),
312		assertz(last_opened_cspm_file(File)).
313
314		:- dynamic cspm_main_process/1.
315		cspm_main_process('MAIN').
316		set_cspm_main_process(M) :-
317		retractall(cspm_main_process(_)),
318		assertz(cspm_main_process(M)).
319
320		reset_xtl_interface :- retractall(last_opened_cspm_file(_)),
321		reset_cspm_main_process.
322		reset_cspm_main_process :- set_cspm_main_process('MAIN').
323
324		:- use_module(eventhandling,[register_event_listener/3]).
325		:- register_event_listener(clear_specification,reset_xtl_interface,
326		'Reset XTL Interface.').
327
328		cspm_transition(root,start_cspm_MAIN,NormalisedNewState) :-
329		cspm_main_process(MAIN),
330		animatable_process_without_arguments(MAIN),
331		get_start_expr(MAIN,NewState),
332		normalise_cspm_state(NewState,NormalisedNewState).
333		cspm_transition(root,start_cspm(X),NormalisedNewState) :- cspm_main_process(MAIN),
334		(get_preference(cspm_animate_all_processes_without_arguments,true)
335		; \+ animatable_process_without_arguments(MAIN)),
336		animatable_process_without_arguments(X),
337		X\=MAIN,
338		get_start_expr(X,NewState),
339		normalise_cspm_state(NewState,NormalisedNewState).
340		cspm_transition(root,start_cspm(X),NormalisedNewState) :- cspm_main_process(MAIN),
341		get_preference(cspm_animate_all_processes,true),
342		animatable_process(X),
343		X\=MAIN,
344		get_start_expr(X,NewState),
345		normalise_cspm_state(NewState,NormalisedNewState).
346		cspm_transition(root,io([V1],print,no_loc_info_available),root) :-
347		cspPrintCompiled(Expr,CompiledExpr), debug_println(9,cspPrintCompiled(Expr,CompiledExpr)),
348		nl, translate:print_csp_value(Expr),
349		print(' == '), nl, print(' '),
350		force_evaluate_argument(CompiledExpr,V1),
351		translate:print_csp_value(V1),nl.
352		cspm_transition(root,no_process_to_animate,root) :-
353		( get_preference(cspm_animate_all_processes,true) ->
354		\+ animatable_process(_)
355		; \+ animatable_process_without_arguments(_)).
356		cspm_transition(State,Action,NormalisedNewState) :- State \= root,
357		%print(comp),nl,
358		cspm_trans_enum(State,Action,NewState),
359		normalise_cspm_state(NewState,NormalisedNewState).
360		%(ActionS = io(V,Ch,_Span) -> Action = io(V,Ch) ; Action=ActionS).
361		%print(new(NewState)),nl. /* TO DO: Normalise */
362
363		cspm_property(State,Property) :-
364		translate_cspm_state(State,Property).
365
366		/* --------------- CSP ----------------- */
367
368
369		get_start_expr(Proc,val_of(Proc,Span)) :- get_symbol_span(Proc,Span).
370
371
372
373		csp_initialisation_for_b(NewState) :- cspm_main_process(MAIN),
374		(animatable_process_without_arguments(MAIN) -> get_start_expr(MAIN,NewState);
375		(animatable_process_without_arguments(X)
376		-> add_error(csp_transition_for_b,'No MAIN process in the CSP file! I am animating:',X),
377		NewState = val_of(X)
378		; add_error(csp_transition_for_b,'No animatable process in the CSP file!'), NewState = stop)
379		).
380
381		csp_transition_for_b(State,Ch,Args,Action,NewState) :- State \= root,
382		% print(cspm_trans_enum(State,Action,NewState)),nl,
383		cspm_trans_enum(State,Action,NewState), %% TO DO: delay enumeration until B operation has been setup ?
384		% print(cspm_trans_enum(Action,NewState)),nl,
385		decompose_event(Action,Ch,Args).
386		% print(b(Ch,BArgs)),nl.
387
388
389		/* needed: an any operation: map any operation<------------- */
390
391		decompose_event(io(V,Ch,_Src),Ch,V).
392		decompose_event(tau(S),tau(S),[]).
393		%% decompose_event(i(S),i(S),[]). %% deprecated
394		decompose_event(tick(S),tick(S),[]).
395
396		generate_b_operationargs_from_csp(V,BArgs) :- l_copy_args_to_b(V,BArgs).
397
398
399		l_copy_args_to_b(tail_in(X),[Y]) :- translate_and_normalise_arg_to_b(X,Y).
400		l_copy_args_to_b([],[]).
401		l_copy_args_to_b([HCSP|T],[HB|TB]) :-
402		copy_args_to_b(HCSP,HB),
403		l_copy_args_to_b(T,TB).
404
405		copy_args_to_b(dot(X),Y) :- !,translate_and_normalise_arg_to_b(X,Y). /* is this still required with the new eval ?? */
406		copy_args_to_b(in(X),Y) :- !,translate_and_normalise_arg_to_b(X,Y).
407		copy_args_to_b(out(X),Y) :- !,translate_and_normalise_arg_to_b(X,Y).
408		copy_args_to_b(X,Y) :- translate_and_normalise_arg_to_b(X,Y).
409
410		:- use_module(store,[normalise_value_for_var/4]).
411
412		translate_and_normalise_arg_to_b(CSP,BN) :- translate_arg_to_b(CSP,B), normalise_value_for_var(csp,true,B,BN).
413
414		:- use_module(tools,[print_message/1, convert_list_into_pairs/2]).
415		:- use_module(custom_explicit_sets,[construct_avl_from_lists/2]).
416
417		%translate_arg_to_b(X,Y) :- print(translate_arg_to_b(X,Y)),nl,fail.
418		translate_arg_to_b(X,X) :- var(X),!.
419		translate_arg_to_b(X,int(X)) :- number(X),!,print_message(converted_int(X)).
420		translate_arg_to_b(fd(N,S),fd(N,S)) :- !. /* copy B SET element across */
421		translate_arg_to_b(string(S),string(S)) :- !. /* copy B STRING element across */
422		translate_arg_to_b(int(N),int(N)) :- !.
423		translate_arg_to_b(true,pred_true /* bool_true */) :- !.
424		translate_arg_to_b(false,pred_false /* bool_false */) :- !.
425		translate_arg_to_b(global_set(N),global_set(N)) :- !.
426		translate_arg_to_b(freetype(N),freetype(N)) :- !.
427		translate_arg_to_b(avl_set(N),avl_set(N)) :- !.
428		translate_arg_to_b(closure(A,B,C),closure(A,B,C)) :- !.
429		translate_arg_to_b(closure(A,B,C,E),closure(A,B,C,E)) :- !.
430		translate_arg_to_b(setValue(S),R) :- !, translate_arg_to_b(S,R1),
431		construct_avl_from_lists(R1,R).
432		%sort(R1,R). % IS SORTING NECESSARY?; we could translate to AVL
433		translate_arg_to_b(list(L),R) :- !, translate_list_to_b(L,1,R1),
434		custom_explicit_sets:construct_avl_from_lists(R1,R).
435		translate_arg_to_b([],[]) :- !.
436		translate_arg_to_b([H|T],[TH|TT]) :- !,translate_arg_to_b(H,TH), translate_arg_to_b(T,TT).
437		translate_arg_to_b((H,T),(TH,TT)) :- !,translate_arg_to_b(H,TH), translate_arg_to_b(T,TT).
438		translate_arg_to_b(na_tuple(L),Res) :- !,l_translate_arg_to_b(L,TL),
439		convert_list_into_pairs(TL,Res).
440		translate_arg_to_b(Constant,BRep) :- translate_b_constant(Constant,BRep),!. /* clause necessary?? */
441		translate_arg_to_b(term(Constant),BRep) :- translate_b_constant(Constant,BRep),!.
442		% TO DO: treat floats/reals
443		translate_arg_to_b(term(N),term(N)) :- !.
444		translate_arg_to_b(DeferredSetEl,FD) :-
445		is_deferred_set_element_name(DeferredSetEl,FD),!.
446		translate_arg_to_b(X,string(X)) :- atomic(X),!. % if the identfier X is not known: translate it to a string
447		% TO DO: some static checking: if no operation has a STRING parameter type, then we can skip this clause and generate an error message straightaway
448		translate_arg_to_b(X,term(X)) :- add_error(translate_arg_to_b,'Unknown CSP datatype, cannot convert to B:',X).
449		/* extend for other types */
450
451		translate_list_to_b([],_,[]).
452		translate_list_to_b([H|T],Nr,[(int(Nr),TH)|TT]) :- translate_arg_to_b(H,TH),
453		N1 is Nr+1, translate_list_to_b(T,N1,TT).
454
455		l_translate_arg_to_b([],[]).
456		l_translate_arg_to_b([H|T],[TH|TT]) :- translate_arg_to_b(H,TH),
457		l_translate_arg_to_b(T,TT).
458
459		:- use_module(tools,[safe_atom_codes/2]).
460		:- use_module(self_check).
461		:- assert_must_succeed( (xtl_interface:is_deferred_set_element_name('Code1',R),R=fd(1,'Code')) ).
462		:- assert_must_fail( xtl_interface:is_deferred_set_element_name('CodeXX',_R) ).
463		is_deferred_set_element_name(DeferredSetEl,fd(Nr,Set)) :- atomic(DeferredSetEl),
464	?	b_global_sets:b_global_deferred_set(Set), atom_codes(Set,SetCodes),
465		append(SetCodes,NrCodes,DC),
466		safe_atom_codes(DeferredSetEl,DC),
467		catch(number_codes(Nr,NrCodes),_,fail).
468
469		:- use_module(b_global_sets,[b_global_set/1, all_elements_of_type/2]).
470
471		translate_b_constant(GS,BRep) :- nonvar(GS),b_global_set(GS),all_elements_of_type(GS,BRep),!.
472		translate_b_constant(Constant,BRep) :- nonvar(Constant),b_global_sets:lookup_global_constant(Constant,BRep),!.