diff --git a/ChangeLog b/ChangeLog
index 9a6823ba62..a6de7dc12a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2013-09-06  Christophe Sadoine
+
+	* Eet: Added EET_DATA_DESCRIPTOR_ADD_SUB_NESTED().
+
 2013-09-24  Jorge Zapata
 
 	* Eina: add a substraction in rectangles and more helpers,
diff --git a/NEWS b/NEWS
index 3f9ab5eee6..1ac141c204 100644
--- a/NEWS
+++ b/NEWS
@@ -45,6 +45,7 @@ Additions:
      - Add eet_mmap()
      - Add eet_data_descriptor_name_get()
      - Add support EET_T_VALUE
+     - Add EET_DATA_DESCRIPTOR_ADD_SUB_NESTED()
     * Eo:
      - Add generic efl object infrastructure
      - Add debugging facility
diff --git a/src/lib/eet/Eet.h b/src/lib/eet/Eet.h
index 935afead9c..3aeb520ea6 100644
--- a/src/lib/eet/Eet.h
+++ b/src/lib/eet/Eet.h
@@ -2391,7 +2391,8 @@ eet_identity_certificate_print(const unsigned char *certificate,
 #define EET_G_HASH           104 /**< Hash table group type */
 #define EET_G_UNION          105 /**< Union group type */
 #define EET_G_VARIANT        106 /**< Selectable subtype group */
-#define EET_G_LAST           107 /**< Last group type */
+#define EET_G_UNKNOWN_NESTED 107 /**< Unknown nested group type. @since 1.8 */
+#define EET_G_LAST           108 /**< Last group type */
 
 #define EET_I_LIMIT          128 /**< Other type exist but are reserved for internal purpose. */
 
@@ -3097,6 +3098,32 @@ eet_data_descriptor_encode(Eet_Data_Descriptor *edd,
                                        0, /* 0,  */ NULL, subtype);            \
     } while (0)
 
+/**
+ * Add a nested sub-element type to a data descriptor
+ * @param edd The data descriptor to add the type to.
+ * @param struct_type The type of the struct.
+ * @param name The string name to use to encode/decode this member
+ *        (must be a constant global and never change).
+ * @param member The struct member itself to be encoded.
+ * @param subtype The type of sub-type struct to add.
+ *
+ * This macro lets you easily add a sub-type: a struct that is nested into
+ * this one. If your data is pointed by this element instead of being nested,
+ * you should use EET_DATA_DESCRIPTOR_ADD_SUB().
+ * All the parameters are the same as for EET_DATA_DESCRIPTOR_ADD_SUB().
+ *
+ * @since 1.8.0
+ * @ingroup Eet_Data_Group
+ */
+#define EET_DATA_DESCRIPTOR_ADD_SUB_NESTED(edd, struct_type, name, member, subtype)   \
+  do {                                                                         \
+       struct_type ___ett;                                                     \
+       eet_data_descriptor_element_add(edd, name, EET_T_UNKNOW, EET_G_UNKNOWN_NESTED, \
+                                       (char *)(& (___ett.member)) -           \
+                                       (char *)(& (___ett)),                   \
+                                       0, /* 0,  */ NULL, subtype);            \
+    } while (0)
+
 /**
  * Add a linked list type to a data descriptor
  * @param edd The data descriptor to add the type to.
diff --git a/src/lib/eet/eet_data.c b/src/lib/eet/eet_data.c
index 0a492ac10a..23d5504661 100644
--- a/src/lib/eet/eet_data.c
+++ b/src/lib/eet/eet_data.c
@@ -548,7 +548,8 @@ static const Eet_Data_Group_Type_Codec eet_group_codec[] =
    { eet_data_get_list, eet_data_put_list },
    { eet_data_get_hash, eet_data_put_hash },
    { eet_data_get_union, eet_data_put_union },
-   { eet_data_get_variant, eet_data_put_variant }
+   { eet_data_get_variant, eet_data_put_variant },
+   { eet_data_get_unknown, eet_data_put_unknown }
 };
 
 static int _eet_data_words_bigendian = -1;
@@ -4570,8 +4571,16 @@ eet_data_get_unknown(Eet_Free_Context     *context,
 
              if (edd)
                {
-                  ptr = (void **)(((char *)data));
-                  *ptr = (void *)data_ret;
+                  if (subtype && ede->group_type == EET_G_UNKNOWN_NESTED)
+                    {
+                       memcpy(data, data_ret, subtype->size);
+                       free(data_ret);
+                    }
+                  else 
+                    {
+                       ptr = (void **)(((char *)data));
+                       *ptr = (void *)data_ret;
+                    }
                }
              else
                {
@@ -4680,11 +4689,18 @@ eet_data_put_unknown(Eet_Dictionary      *ed,
    if (IS_SIMPLE_TYPE(ede->type))
      data = eet_data_put_type(ed, ede->type, data_in, &size);
    else if (ede->subtype)
-     if (*((char **)data_in))
-       data = _eet_data_descriptor_encode(ed,
-                                          ede->subtype,
-                                          *((char **)((char *)(data_in))),
-                                          &size);
+     {
+        if (ede->group_type == EET_G_UNKNOWN_NESTED)
+          data = _eet_data_descriptor_encode(ed,
+                                             ede->subtype,
+                                             data_in,
+                                             &size);
+        else if (*((char **)data_in))
+          data = _eet_data_descriptor_encode(ed,
+                                             ede->subtype,
+                                             *((char **)((char *)(data_in))),
+                                             &size);
+     }
 
    if (data)
      eet_data_encode(ed,