diff --git a/example/ex-multi02.c b/example/ex-multi02.c
index 42499b86..b949f0ad 100644
--- a/example/ex-multi02.c
+++ b/example/ex-multi02.c
@@ -8,35 +8,42 @@
 #include "m-dict.h"
 #include "m-array.h"
 
+/* Define the OPLIST of a mpz_t and register it globally */
+#define M_OPL_mpz_t()                                                   \
+  (INIT(mpz_init), INIT_SET(mpz_init_set), SET(mpz_set), CLEAR(mpz_clear), \
+   EQUAL( API( mpz_cmp, EQ(0), ARG1, ARG2)),                            \
+   CMP(mpz_cmp),                                                        \
+   OUT_STR( API( mpz_out_str, VOID, ARG1, 10, ARG2)),                   \
+   IN_STR( API( mpz_inp_str, GT(0), ARG1, ARG2, 10)),                   \
+   TYPE(mpz_t) )
+
 /* Define a variant over two integers named integer_t
    Notice than mpz_t has special init & clear functions
    mpz_init & mpz_clear.
    This is handle by the library.
 */
 VARIANT_DEF2(my_integer,
-             (n, long long, M_DEFAULT_OPLIST),
-             (z, mpz_t, M_CLASSIC_OPLIST(mpz)))
-/* Define the oplist associated to this variant */
-#define MY_INTEGER_OPLIST VARIANT_OPLIST(my_integer, M_DEFAULT_OPLIST, M_CLASSIC_OPLIST(mpz))
+             (n, long long),
+             (z, mpz_t))
+/* Define the oplist associated to this variant and register it */
+#define M_OPL_my_integer_t() VARIANT_OPLIST(my_integer, M_DEFAULT_OPLIST, M_OPL_mpz_t() )
 
 /* Define a dictionary of string --> integer named dict_my_t */
-DICT_DEF2(my_dict,
-          string_t, STRING_OPLIST,
-          my_integer_t, MY_INTEGER_OPLIST)
-/* Define the oplist associated to this dictionary */
-#define MY_DICT_OPLIST DICT_OPLIST(my_dict, STRING_OPLIST, MY_INTEGER_OPLIST)
+DICT_DEF2(my_dict, string_t, my_integer_t)
+/* Define the oplist associated to this dictionary and register it */
+#define M_OPL_my_dict_t() DICT_OPLIST(my_dict, STRING_OPLIST, M_OPL_my_integer_t() )
 
 /* Define an array of such dictionary named array_my_t */
-ARRAY_DEF(my_array, my_dict_t, MY_DICT_OPLIST)
-/* Define the oplist associated to this array of dictionary of variant */
-#define MY_ARRAY_OPLIST ARRAY_OPLIST(my_array, MY_DICT_OPLIST)
+ARRAY_DEF(my_array, my_dict_t)
+/* Define the oplist associated to this array of dictionary of variant and register it */
+#define M_OPL_my_array_t() ARRAY_OPLIST(my_array, M_OPL_my_dict_t())
 
 int main(void)
 {
-  M_LET(z, MY_INTEGER_OPLIST)         /* Define & init & clear an instance of a variant of integer */
-    M_LET(dict, MY_DICT_OPLIST)       /* Define & init & clear an instance of a dictionary of variant */
-    M_LET(array, MY_ARRAY_OPLIST)     /* Define & init & clear an intance of an array of dictionary of variant */
-    M_LET(gmp, M_CLASSIC_OPLIST(mpz)) /* M_LET allows even with non container type */
+  M_LET(z, my_integer_t)              /* Define & init & clear an instance of a variant of integer */
+    M_LET(dict, my_dict_t)            /* Define & init & clear an instance of a dictionary of variant */
+    M_LET(array, my_array_t)          /* Define & init & clear an intance of an array of dictionary of variant */
+    M_LET(gmp, mpz_t)                 /* M_LET allows even with non container type */
     {
       my_integer_set_n (z, 17LL);                // Set z as the long long 17
       my_dict_set_at(dict, STRING_CTE("n1"), z); // Push it in the dictionary
@@ -46,9 +53,9 @@ int main(void)
       my_array_push_back (array, dict);          // Push the dictionary in the array
 
       // Iterate over the array container
-      for M_EACH(item, array, MY_ARRAY_OPLIST) {
+      for M_EACH(item, array, my_array_t) {
           // Iterate over the dictionary container
-          for M_EACH(p, *item, MY_DICT_OPLIST) {
+          for M_EACH(p, *item, M_OPL_my_dict_t()) {
               // Dictionary iterator are pair (key,value)
               if (my_integer_n_p(p->value)) {
                 printf ("It is a long long, value = %lld\n",