sig
type bltin = Algebra_type.item_cursor_nary_to_item_cursor_code
type bltin_mat = Algebra_type.item_list_nary_to_item_list_code
val lookup_bltin_fctn :
Xquery_common_ast.cfname * int ->
Code_selection_context.code_selection_context -> Code_fn.bltin
val add_bltin_fctn :
(Xquery_common_ast.cfname * int) *
(Code_selection_context.code_selection_context -> Code_fn.bltin) ->
unit
val _fn_boolean : Algebra_type.alg_compile_context -> Code_fn.bltin
end