diff --git a/test/test_option_calculation.py b/test/test_option_calculation.py
index 8ca8687..117de9d 100644
--- a/test/test_option_calculation.py
+++ b/test/test_option_calculation.py
@@ -28,6 +28,12 @@ def return_value(value=None):
     return value
 
 
+def return_value2(*args, **kwargs):
+    value = list(args)
+    value.extend(kwargs.values())
+    return value
+
+
 def make_description():
     gcoption = ChoiceOption('name', 'GC name', ('ref', 'framework'), 'ref')
     gcdummy = BoolOption('dummy', 'dummy', default=False)
@@ -675,3 +681,13 @@ def test_callback_multi_multi():
     raises(ConfigError, "cfg.val4")
     assert cfg.val5 == ['val1', 'val4', 'val2', 'val4', 'val3', 'val4']
     assert cfg.val7 == ['val1', 'val21', 'val2', 'val22', 'val3', 'val23']
+
+
+def test_multi_with_no_value():
+    #First option return [] (so without value)
+    val1 = StrOption('val1', "", ['val'], multi=True)
+    val2 = StrOption('val2', "", multi=True)
+    val3 = StrOption('val3', '', multi=True, callback=return_value, callback_params={'': ((val2, False),), 'value': ((val1, False),)})
+    od = OptionDescription('od', '', [val1, val2, val3])
+    c = Config(od)
+    raises(ConfigError, "c.val3")
diff --git a/tiramisu/autolib.py b/tiramisu/autolib.py
index de8a8c5..efb7c0e 100644
--- a/tiramisu/autolib.py
+++ b/tiramisu/autolib.py
@@ -41,6 +41,13 @@ def carry_out_calculation(name, config, callback, callback_params,
     :param max_len: max length for a multi
     :type max_len: int
 
+    The callback_params is a dict. Key is used to build args (if key is '')
+    and kwargs (otherwise). Values are tuple of:
+    - values
+    - tuple with option and boolean's force_permissive (True when don't raise
+    if PropertiesOptionError)
+    Values could have multiple values only when key is ''.
+
     * if no callback_params:
       => calculate()
 
@@ -92,7 +99,6 @@ def carry_out_calculation(name, config, callback, callback_params,
       - a multi option with an other multi option but with same length
           opt1 == [1, 2, 3]
           opt2 == [11, 12, 13]
-          callback_params={'': ((opt1, False), (opt2, False))}
           => calculate(1, 11)
           => calculate(2, 12)
           => calculate(3, 13)
@@ -100,9 +106,13 @@ def carry_out_calculation(name, config, callback, callback_params,
       - a multi option with an other multi option but with different length
           opt1 == [1, 2, 3]
           opt2 == [11, 12]
-          callback_params={'': ((opt1, False), (opt2, False))}
           => ConfigError()
 
+      - a multi option without value with a simple option
+          opt1 == []
+          opt2 == 11
+          => []
+
     * if callback_params={'value': ((opt1, False), (opt2, False))}
       => ConfigError()
 
@@ -114,39 +124,47 @@ def carry_out_calculation(name, config, callback, callback_params,
     If calculate return list, this list is extend to return value.
     """
     tcparams = {}
+    # if callback_params has a callback, launch several time calculate()
     one_is_multi = False
-    len_multi = 0
+    # multi's option should have same value for all option
+    len_multi = None
 
     for key, callbacks in callback_params.items():
         for callbk in callbacks:
             if isinstance(callbk, tuple):
+                # callbk is something link (opt, True|False)
                 option, force_permissive = callbk
+                path = config.cfgimpl_get_description().impl_get_path_by_opt(
+                    option)
                 # get value
                 try:
-                    path = config.cfgimpl_get_description().impl_get_path_by_opt(option)
                     value = config._getattr(path, force_permissive=True)
                 except PropertiesOptionError as err:
                     if force_permissive:
                         continue
                     raise ConfigError(_('unable to carry out a calculation, '
                                         'option {0} has properties: {1} for: '
-                                        '{2}').format(option._name, err.proptype,
+                                        '{2}').format(option._name,
+                                                      err.proptype,
                                                       name))
                 is_multi = option.impl_is_multi()
                 if is_multi:
-                    if value is not None:
-                        len_value = len(value)
-                        if len_multi != 0 and len_multi != len_value:
-                            raise ConfigError(_('unable to carry out a '
-                                              'calculation, option value with'
-                                              ' multi types must have same '
-                                              'length for: {0}').format(name))
-                        len_multi = len_value
+                    len_value = len(value)
+                    if len_multi is not None and len_multi != len_value:
+                        raise ConfigError(_('unable to carry out a '
+                                            'calculation, option value with'
+                                            ' multi types must have same '
+                                            'length for: {0}').format(name))
+                    len_multi = len_value
                     one_is_multi = True
                 tcparams.setdefault(key, []).append((value, is_multi))
             else:
+                # callbk is a value and not a multi
                 tcparams.setdefault(key, []).append((callbk, False))
 
+    # if one value is a multi, launch several time calculate
+    # if index is set, return a value
+    # if no index, return a list
     if one_is_multi:
         ret = []
         if index:
@@ -161,19 +179,20 @@ def carry_out_calculation(name, config, callback, callback_params,
             else:
                 range_ = range(len_multi)
         for incr in range_:
-            tcp = {}
-            params = []
+            args = []
+            kwargs = {}
             for key, couples in tcparams.items():
                 for couple in couples:
                     value, ismulti = couple
-                    if ismulti and value is not None:
-                        if key == '':
-                            params.append(value[incr])
-                        else:
-                            tcp[key] = value[incr]
+                    if ismulti:
+                        val = value[incr]
                     else:
-                        params.append(value)
-            calc = calculate(name, callback, params, tcp)
+                        val = value
+                    if key == '':
+                        args.append(val)
+                    else:
+                        kwargs[key] = val
+            calc = calculate(callback, args, kwargs)
             if index:
                 ret = calc
             else:
@@ -183,24 +202,26 @@ def carry_out_calculation(name, config, callback, callback_params,
                     ret.append(calc)
         return ret
     else:
-        tcp = {}
-        params = []
+        # no value is multi
+        # return a single value
+        args = []
+        kwargs = {}
         for key, couples in tcparams.items():
             for couple in couples:
+                # couple[1] (ismulti) is always False
                 if key == '':
-                    value = couple[0]
-                    params.append(value)
+                    args.append(couple[0])
                 else:
-                    tcp[key] = couple[0]
-        return calculate(name, callback, params, tcp)
+                    kwargs[key] = couple[0]
+        return calculate(callback, args, kwargs)
 
 
-def calculate(name, callback, params, tcparams):
+def calculate(callback, args, kwargs):
     """wrapper that launches the 'callback'
 
-    :param callback: callback name
-    :param params: in the callback's arity, the unnamed parameters
-    :param tcparams: in the callback's arity, the named parameters
+    :param callback: callback function
+    :param args: in the callback's arity, the unnamed parameters
+    :param kwargs: in the callback's arity, the named parameters
 
     """
-    return callback(*params, **tcparams)
+    return callback(*args, **kwargs)
diff --git a/tiramisu/config.py b/tiramisu/config.py
index f1b2851..3687349 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -1,5 +1,4 @@
 # -*- coding: utf-8 -*-
-"options handler global entry point"
 # Copyright (C) 2012-2013 Team tiramisu (see AUTHORS for all contributors)
 #
 # This program is free software; you can redistribute it and/or modify
@@ -20,6 +19,7 @@
 # the rough pypy's guys: http://codespeak.net/svn/pypy/dist/pypy/config/
 # the whole pypy projet is under MIT licence
 # ____________________________________________________________
+"options handler global entry point"
 import weakref
 from tiramisu.error import PropertiesOptionError, ConfigError
 from tiramisu.option import OptionDescription, Option, SymLinkOption
@@ -31,7 +31,11 @@ from tiramisu.i18n import _
 
 
 class SubConfig(object):
-    "sub configuration management entry"
+    """Sub configuration management entry.
+    Tree if OptionDescription's responsability. SubConfig are generated
+    on-demand. A Config is also a SubConfig.
+    Root Config is call context below
+    """
     __slots__ = ('_impl_context', '_impl_descr', '_impl_path')
 
     def __init__(self, descr, context, subpath=None):
@@ -56,6 +60,7 @@ class SubConfig(object):
 
     def cfgimpl_reset_cache(self, only_expired=False, only=('values',
                                                             'settings')):
+        "remove cache (in context)"
         self._cfgimpl_get_context().cfgimpl_reset_cache(only_expired, only)
 
     def cfgimpl_get_home_by_path(self, path, force_permissive=False,
diff --git a/tiramisu/option.py b/tiramisu/option.py
index 10aba5c..fb76444 100644
--- a/tiramisu/option.py
+++ b/tiramisu/option.py
@@ -1325,6 +1325,6 @@ def validate_callback(callback, callback_params, type_):
                                            ).format(type_, type(option)))
                     if force_permissive not in [True, False]:
                         raise ValueError(_('{0}_params should have a boolean'
-                                           'not a {0} for second argument'
+                                           ' not a {0} for second argument'
                                            ).format(type_, type(
                                                force_permissive)))
diff --git a/translations/fr/tiramisu.po b/translations/fr/tiramisu.po
index 8bceb43..9e8e2f4 100644
--- a/translations/fr/tiramisu.po
+++ b/translations/fr/tiramisu.po
@@ -2,7 +2,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: \n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2013-08-31 09:52+CEST\n"
+"POT-Creation-Date: 2013-09-23 20:59+CEST\n"
 "PO-Revision-Date: \n"
 "Last-Translator: Emmanuel Garette <egarette@cadoles.com>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -11,18 +11,14 @@ msgstr ""
 "Content-Transfer-Encoding: 8bit\n"
 "X-Generator: Poedit 1.5.4\n"
 
-#: tiramisu/autolib.py:58
-msgid "no config specified but needed"
-msgstr "aucune config spécifié alors que c'est nécessaire"
-
-#: tiramisu/autolib.py:65
+#: tiramisu/autolib.py:131
 msgid ""
 "unable to carry out a calculation, option {0} has properties: {1} for: {2}"
 msgstr ""
 "impossible d'effectuer le calcul, l'option {0} a les propriétés : {1} pour : "
 "{2}"
 
-#: tiramisu/autolib.py:74
+#: tiramisu/autolib.py:140
 msgid ""
 "unable to carry out a calculation, option value with multi types must have "
 "same length for: {0}"
@@ -30,79 +26,75 @@ msgstr ""
 "impossible d'effectuer le calcul, valeur d'un option avec le type multi doit "
 "avoir la même longueur pour : {0}"
 
-#: tiramisu/config.py:47
+#: tiramisu/config.py:48
 msgid "descr must be an optiondescription, not {0}"
 msgstr "descr doit être une optiondescription pas un {0}"
 
-#: tiramisu/config.py:121
+#: tiramisu/config.py:122
 msgid "unknown group_type: {0}"
 msgstr "group_type inconnu: {0}"
 
-#: tiramisu/config.py:157
+#: tiramisu/config.py:158
 msgid ""
 "no option description found for this config (may be metaconfig without meta)"
 msgstr ""
 "pas d'option description pour cette config (peut être une metaconfig sans "
 "meta)"
 
-#: tiramisu/config.py:311
+#: tiramisu/config.py:313
 msgid "unknown type_ type {0}for _find"
 msgstr "type_ type {0} pour _find inconnu"
 
-#: tiramisu/config.py:350
+#: tiramisu/config.py:352
 msgid "no option found in config with these criteria"
 msgstr "aucune option trouvée dans la config avec ces critères"
 
-#: tiramisu/config.py:400
+#: tiramisu/config.py:402
 msgid "make_dict can't filtering with value without option"
 msgstr "make_dict ne peut filtrer sur une valeur mais sans option"
 
-#: tiramisu/config.py:421
+#: tiramisu/config.py:423
 msgid "unexpected path {0}, should start with {1}"
 msgstr "chemin imprévu {0}, devrait commencer par {1}"
 
-#: tiramisu/config.py:481
+#: tiramisu/config.py:483
 msgid "opt in getowner must be an option not {0}"
 msgstr "opt dans getowner doit être une option pas {0}"
 
-#: tiramisu/option.py:71
-msgid "{0} has no attribute impl_set_information"
-msgstr "{0} n'a pas d'attribut impl_set_information"
-
-#: tiramisu/option.py:86
-msgid "information's item not found: {0}"
-msgstr "aucune config spécifié alors que c'est nécessaire"
-
-#: tiramisu/option.py:89
-msgid "{0} has no attribute impl_get_information"
-msgstr "{0} n'a pas d'attribut impl_get_information"
-
-#: tiramisu/option.py:117
-msgid "'{0}' ({1}) object attribute '{2}' is read-only"
-msgstr "l'attribut {2} de l'objet '{0}' ({1}) est en lecture seul"
-
-#: tiramisu/option.py:159
+#: tiramisu/option.py:69
 msgid "invalid name: {0} for option"
 msgstr "nom invalide : {0} pour l'option"
 
-#: tiramisu/option.py:169
-msgid "validator must be a function"
-msgstr "validator doit être une fonction"
+#: tiramisu/option.py:79
+msgid "invalid properties type {0} for {1}, must be a tuple"
+msgstr "type des properties invalide {0} pour {1}, doit être un tuple"
 
-#: tiramisu/option.py:176
+#: tiramisu/option.py:121
+msgid "'{0}' ({1}) object attribute '{2}' is read-only"
+msgstr "l'attribut {2} de l'objet '{0}' ({1}) est en lecture seul"
+
+#: tiramisu/option.py:148 tiramisu/value.py:361
+msgid "information's item not found: {0}"
+msgstr "aucune config spécifié alors que c'est nécessaire"
+
+#: tiramisu/option.py:265
+msgid "cannot serialize Option, only in OptionDescription"
+msgstr "ne peut serialiser une Option, seulement via une OptionDescription"
+
+#: tiramisu/option.py:364
 msgid "a default_multi is set whereas multi is False in option: {0}"
 msgstr ""
 "une default_multi est renseigné alors que multi est False dans l'option : {0}"
 
-#: tiramisu/option.py:182
+#: tiramisu/option.py:370
 msgid "invalid default_multi value {0} for option {1}: {2}"
 msgstr "la valeur default_multi est invalide {0} pour l'option {1} : {2}"
 
-#: tiramisu/option.py:187
+#: tiramisu/option.py:375
 msgid "default value not allowed if option: {0} is calculated"
 msgstr "la valeur par défaut n'est pas possible si l'option {0} est calculé"
 
-#: tiramisu/option.py:190
+#: tiramisu/option.py:378
 msgid ""
 "params defined for a callback function but no callback defined yet for "
 "option {0}"
@@ -110,183 +102,179 @@ msgstr ""
 "params définit pour une fonction callback mais par de callback défini encore "
 "pour l'option {0}"
 
-#: tiramisu/option.py:212 tiramisu/option.py:753
-msgid "invalid properties type {0} for {1}, must be a tuple"
-msgstr "type des properties invalide {0} pour {1}, doit être un tuple"
+#: tiramisu/option.py:463
+msgid "validator should return a boolean, not {0}"
+msgstr "validator devrait retourner un boolean, pas un {0}"
 
-#: tiramisu/option.py:285
+#: tiramisu/option.py:473
 msgid "invalid value {0} for option {1} for object {2}"
 msgstr "valeur invalide {0} pour l'option {1} pour l'objet {2}"
 
-#: tiramisu/option.py:293 tiramisu/value.py:468
+#: tiramisu/option.py:481 tiramisu/value.py:542
 msgid "invalid value {0} for option {1}: {2}"
 msgstr "valeur invalide {0} pour l'option {1} : {2}"
 
-#: tiramisu/option.py:305
+#: tiramisu/option.py:493
 msgid "invalid value {0} for option {1} which must be a list"
 msgstr "valeur invalide {0} pour l'option {1} qui doit être une liste"
 
-#: tiramisu/option.py:374
+#: tiramisu/option.py:562
 msgid "invalid value {0} for option {1} must be different as {2} option"
 msgstr ""
 "valeur invalide {0} pour l'option {1} doit être différent que l'option {2}"
 
-#: tiramisu/option.py:396
+#: tiramisu/option.py:618
 msgid "values must be a tuple for {0}"
 msgstr "values doit être un tuple pour {0}"
 
-#: tiramisu/option.py:399
+#: tiramisu/option.py:621
 msgid "open_values must be a boolean for {0}"
 msgstr "open_values doit être un booléen pour {0}"
 
-#: tiramisu/option.py:420
+#: tiramisu/option.py:642
 msgid "value {0} is not permitted, only {1} is allowed"
 msgstr "valeur {0} n'est pas permit, seules {1} sont autorisées"
 
-#: tiramisu/option.py:432
+#: tiramisu/option.py:654
 msgid "value must be a boolean"
 msgstr "valeur doit être un booléen"
 
-#: tiramisu/option.py:442
+#: tiramisu/option.py:664
 msgid "value must be an integer"
 msgstr "valeur doit être un numbre"
 
-#: tiramisu/option.py:452
+#: tiramisu/option.py:674
 msgid "value must be a float"
 msgstr "valeur doit être un nombre flottant"
 
-#: tiramisu/option.py:462
+#: tiramisu/option.py:684
 msgid "value must be a string, not {0}"
 msgstr "valeur doit être une chaîne, pas {0}"
 
-#: tiramisu/option.py:480
+#: tiramisu/option.py:702
 msgid "value must be an unicode"
 msgstr "valeur doit être une valeur unicode"
 
-#: tiramisu/option.py:490
+#: tiramisu/option.py:714
 msgid "malformed symlinkoption must be an option for symlink {0}"
 msgstr "symlinkoption mal formé doit être une option pour symlink {0}"
 
-#: tiramisu/option.py:526
-msgid "IP shall not be in reserved class"
+#: tiramisu/option.py:766
+msgid "IP mustn't not be in reserved class"
 msgstr "IP ne doit pas être d'une classe reservée"
 
-#: tiramisu/option.py:528
+#: tiramisu/option.py:768
 msgid "IP must be in private class"
 msgstr "IP doit être dans la classe privée"
 
-#: tiramisu/option.py:566
+#: tiramisu/option.py:806
 msgid "inconsistency in allowed range"
 msgstr "inconsistence dans la plage autorisée"
 
-#: tiramisu/option.py:571
+#: tiramisu/option.py:811
 msgid "max value is empty"
 msgstr "valeur maximum est vide"
 
-#: tiramisu/option.py:608
+#: tiramisu/option.py:848
 msgid "network shall not be in reserved class"
 msgstr "réseau ne doit pas être dans la classe reservée"
 
-#: tiramisu/option.py:640
+#: tiramisu/option.py:880
 msgid "invalid network {0} ({1}) with netmask {2} ({3}), this network is an IP"
 msgstr "réseau invalide {0} ({1}) avec masque {2} ({3}), ce réseau est une IP"
 
-#: tiramisu/option.py:645
+#: tiramisu/option.py:885
 msgid "invalid IP {0} ({1}) with netmask {2} ({3}), this IP is a network"
 msgstr "IP invalide {0} ({1}) avec masque {2} ({3}), cette IP est un réseau"
 
-#: tiramisu/option.py:650
+#: tiramisu/option.py:890
 msgid "invalid IP {0} ({1}) with netmask {2} ({3})"
 msgstr "IP invalide {0} ({1}) avec masque {2} ({3})"
 
-#: tiramisu/option.py:652
+#: tiramisu/option.py:892
 msgid "invalid network {0} ({1}) with netmask {2} ({3})"
 msgstr "réseau invalide {0} ({1}) avec masque {2} ({3})"
 
-#: tiramisu/option.py:672
+#: tiramisu/option.py:912
 msgid "unknown type_ {0} for hostname"
 msgstr "type_ inconnu {0} pour le nom d'hôte"
 
-#: tiramisu/option.py:675
+#: tiramisu/option.py:915
 msgid "allow_ip must be a boolean"
 msgstr "allow_ip doit être un booléen"
 
-#: tiramisu/option.py:704
+#: tiramisu/option.py:944
 msgid "invalid value for {0}, must have dot"
 msgstr "valeur invalide pour {0}, doit avoir un point"
 
-#: tiramisu/option.py:707
+#: tiramisu/option.py:947
 msgid "invalid domainname's length for {0} (max {1})"
 msgstr "longueur du nom de domaine invalide pour {0} (maximum {1})"
 
-#: tiramisu/option.py:710
+#: tiramisu/option.py:950
 msgid "invalid domainname's length for {0} (min 2)"
 msgstr "longueur du nom de domaine invalide pour {0} (minimum 2)"
 
-#: tiramisu/option.py:714
+#: tiramisu/option.py:954
 msgid "invalid domainname"
 msgstr "nom de domaine invalide"
 
-#: tiramisu/option.py:731
-msgid "invalid name: {0} for optiondescription"
-msgstr "nom invalide : {0} pour l'optiondescription"
-
-#: tiramisu/option.py:743
+#: tiramisu/option.py:981
 msgid "duplicate option name: {0}"
 msgstr "nom de l'option dupliqué : {0}"
 
-#: tiramisu/option.py:769
+#: tiramisu/option.py:998
 msgid "unknown Option {0} in OptionDescription {1}"
 msgstr "Option {} inconnue pour l'OptionDescription{}"
 
-#: tiramisu/option.py:820
+#: tiramisu/option.py:1049
 msgid "duplicate option: {0}"
 msgstr "option dupliquée : {0}"
 
-#: tiramisu/option.py:850
+#: tiramisu/option.py:1083
 msgid "no option for path {0}"
 msgstr "pas d'option pour le chemin {0}"
 
-#: tiramisu/option.py:856
+#: tiramisu/option.py:1089
 msgid "no option {0} found"
 msgstr "pas d'option {0} trouvée"
 
-#: tiramisu/option.py:866
+#: tiramisu/option.py:1099
 msgid "cannot change group_type if already set (old {0}, new {1})"
 msgstr "ne peut changer group_type si déjà spécifié (ancien {0}, nouveau {1})"
 
-#: tiramisu/option.py:879
+#: tiramisu/option.py:1112
 msgid "master group {0} shall not have a subgroup"
 msgstr "groupe maître {0} ne doit pas avoir de sous-groupe"
 
-#: tiramisu/option.py:882
+#: tiramisu/option.py:1115
 msgid "master group {0} shall not have a symlinkoption"
 msgstr "groupe maître {0} ne doit pas avoir de symlinkoption"
 
-#: tiramisu/option.py:885
+#: tiramisu/option.py:1118
 msgid "not allowed option {0} in group {1}: this option is not a multi"
 msgstr ""
 "option non autorisée {0} dans le groupe {1} : cette option n'est pas une "
 "multi"
 
-#: tiramisu/option.py:896
+#: tiramisu/option.py:1129
 msgid "master group with wrong master name for {0}"
 msgstr "le groupe maître avec un nom de maître éroné pour {0}"
 
-#: tiramisu/option.py:905
+#: tiramisu/option.py:1138
 msgid "no child has same nom has master group for: {0}"
 msgstr "pas d'enfant avec le nom du groupe maître pour {0} "
 
-#: tiramisu/option.py:908
+#: tiramisu/option.py:1141
 msgid "group_type: {0} not allowed"
 msgstr "group_type : {0} non autorisé"
 
-#: tiramisu/option.py:946
+#: tiramisu/option.py:1231
 msgid "malformed requirements type for option: {0}, must be a dict"
 msgstr ""
 "type requirements malformé pour l'option : {0}, doit être un dictionnaire"
 
-#: tiramisu/option.py:962
+#: tiramisu/option.py:1248
 msgid ""
 "malformed requirements for option: {0} require must have option, expected "
 "and action keys"
@@ -294,87 +282,108 @@ msgstr ""
 "requirements malformé pour l'option : {0} l'exigence doit avoir les clefs "
 "option, exptected et action"
 
-#: tiramisu/option.py:967
+#: tiramisu/option.py:1253
 msgid "malformed requirements for option: {0} inverse must be boolean"
 msgstr "requirements malformé pour l'option : {0} inverse doit être un booléen"
 
-#: tiramisu/option.py:971
+#: tiramisu/option.py:1257
 msgid "malformed requirements for option: {0} transitive must be boolean"
 msgstr "requirements malformé pour l'option : {0} transitive doit être booléen"
 
-#: tiramisu/option.py:975
+#: tiramisu/option.py:1261
 msgid "malformed requirements for option: {0} same_action must be boolean"
 msgstr ""
 "requirements malformé pour l'option : {0} same_action doit être un booléen"
 
-#: tiramisu/option.py:979
+#: tiramisu/option.py:1265
 msgid "malformed requirements must be an option in option {0}"
 msgstr "requirements malformé doit être une option dans l'option {0}"
 
-#: tiramisu/option.py:982
+#: tiramisu/option.py:1268
 msgid "malformed requirements option {0} should not be a multi"
 msgstr "requirements malformé l'option {0} ne doit pas être une multi"
 
-#: tiramisu/option.py:988
+#: tiramisu/option.py:1274
 msgid ""
 "malformed requirements second argument must be valid for option {0}: {1}"
 msgstr ""
 "requirements malformé deuxième argument doit être valide pour l'option {0} : "
 "{1}"
 
-#: tiramisu/option.py:993
+#: tiramisu/option.py:1279
 msgid "inconsistency in action types for option: {0} action: {1}"
 msgstr "incohérence dans les types action pour l'option : {0} action {1}"
 
-#: tiramisu/setting.py:47
-msgid "storage_type is already set, cannot rebind it"
-msgstr "storage_type est déjà défini, impossible de le redéfinir"
+#: tiramisu/option.py:1304
+msgid "{0} should be a function"
+msgstr "{0} doit être une fonction"
 
-#: tiramisu/setting.py:67
+#: tiramisu/option.py:1307
+msgid "{0}_params should be a dict"
+msgstr "{0}_params devrait être un dict"
+
+#: tiramisu/option.py:1310
+msgid "{0}_params with key {1} should not have length different to 1"
+msgstr ""
+"{0}_params avec la clef {1} devrait ne pas avoir une longueur différent de 1"
+
+#: tiramisu/option.py:1314
+msgid "{0}_params should be tuple for key \"{1}\""
+msgstr "{0}_params devrait être un tuple pour la clef \"{1}\""
+
+#: tiramisu/option.py:1320
+msgid "validator not support tuple"
+msgstr "validator n'accepte pas de tuple"
+
+#: tiramisu/option.py:1323
+msgid "{0}_params should have an option not a {0} for first argument"
+msgstr "{0}_params devrait avoir une option pas un {0} pour première argument"
+
+#: tiramisu/option.py:1327
+msgid "{0}_params should have a boolean not a {0} for second argument"
+msgstr "{0}_params devrait avoir un boolean pas un {0} pour second argument"
+
+#: tiramisu/setting.py:116
 msgid "can't rebind {0}"
 msgstr "ne peut redéfinir ({0})"
 
-#: tiramisu/setting.py:72
+#: tiramisu/setting.py:121
 msgid "can't unbind {0}"
 msgstr "ne peut supprimer ({0})"
 
-#: tiramisu/setting.py:185
+#: tiramisu/setting.py:259
 msgid "cannot append {0} property for option {1}: this property is calculated"
 msgstr ""
 "ne peut ajouter la propriété {0} dans l'option {1}: cette propriété est "
 "calculée"
 
-#: tiramisu/setting.py:215
-msgid "option {0} not already exists in storage {1}"
-msgstr "option {0} n'existe pas dans l'espace de stockage {1}"
-
-#: tiramisu/setting.py:282
+#: tiramisu/setting.py:322
 msgid "opt and all_properties must not be set together in reset"
 msgstr "opt et all_properties ne doit pas être renseigné ensemble dans reset"
 
-#: tiramisu/setting.py:297
+#: tiramisu/setting.py:337
 msgid "if opt is not None, path should not be None in _getproperties"
 msgstr ""
 "si opt n'est pas None, path devrait ne pas être à None dans _getproperties"
 
-#: tiramisu/setting.py:391
+#: tiramisu/setting.py:440
 msgid "cannot change the value for option {0} this option is frozen"
 msgstr ""
 "ne peut modifié la valeur de l'option {0} cette option n'est pas modifiable"
 
-#: tiramisu/setting.py:397
+#: tiramisu/setting.py:446
 msgid "trying to access to an option named: {0} with properties {1}"
 msgstr "tentative d'accès à une option nommée : {0} avec les propriétés {1}"
 
-#: tiramisu/setting.py:415
+#: tiramisu/setting.py:464
 msgid "permissive must be a tuple"
 msgstr "permissive doit être un tuple"
 
-#: tiramisu/setting.py:422 tiramisu/value.py:277
+#: tiramisu/setting.py:471 tiramisu/value.py:300
 msgid "invalid generic owner {0}"
 msgstr "invalide owner générique {0}"
 
-#: tiramisu/setting.py:503
+#: tiramisu/setting.py:558
 msgid ""
 "malformed requirements imbrication detected for option: '{0}' with "
 "requirement on: '{1}'"
@@ -382,65 +391,85 @@ msgstr ""
 "imbrication de requirements malformé detectée pour l'option : '{0}' avec "
 "requirement sur : '{1}'"
 
-#: tiramisu/setting.py:515
+#: tiramisu/setting.py:570
 msgid "option '{0}' has requirement's property error: {1} {2}"
 msgstr "l'option '{0}' a une erreur de propriété pour le requirement : {1} {2}"
 
-#: tiramisu/storage/dictionary/storage.py:37
+#: tiramisu/storage/__init__.py:52
+msgid "storage_type is already set, cannot rebind it"
+msgstr "storage_type est déjà défini, impossible de le redéfinir"
+
+#: tiramisu/storage/__init__.py:86
+msgid "option {0} not already exists in storage {1}"
+msgstr "option {0} n'existe pas dans l'espace de stockage {1}"
+
+#: tiramisu/storage/dictionary/storage.py:39
 msgid "dictionary storage cannot delete session"
 msgstr ""
 "impossible de supprimer une session dans un espace de stockage dictionary"
 
-#: tiramisu/storage/dictionary/storage.py:46
+#: tiramisu/storage/dictionary/storage.py:50
 msgid "session already used"
 msgstr "session déjà utilisée"
 
-#: tiramisu/storage/dictionary/storage.py:48
+#: tiramisu/storage/dictionary/storage.py:52
 msgid "a dictionary cannot be persistent"
 msgstr "un espace de stockage dictionary ne peut être persistant"
 
-#: tiramisu/value.py:284
+#: tiramisu/value.py:307
 msgid "no value for {0} cannot change owner to {1}"
 msgstr "pas de valeur pour {0} ne peut changer d'utilisateur pour {1}"
 
-#: tiramisu/value.py:356
+#: tiramisu/value.py:414
 msgid "invalid len for the slave: {0} which has {1} as master"
 msgstr "longueur invalide pour une esclave : {0} qui a {1} comme maître"
 
-#: tiramisu/value.py:373
+#: tiramisu/value.py:438
 msgid "invalid len for the master: {0} which has {1} as slave with greater len"
 msgstr ""
 "longueur invalide pour un maître : {0} qui a {1} une esclave avec une plus "
 "grande longueur"
 
-#: tiramisu/value.py:394
+#: tiramisu/value.py:468
 msgid "cannot append a value on a multi option {0} which is a slave"
 msgstr "ne peut ajouter une valeur sur l'option multi {0} qui est une esclave"
 
-#: tiramisu/value.py:429
+#: tiramisu/value.py:503
 msgid "cannot sort multi option {0} if master or slave"
 msgstr "ne peut trier une option multi {0} pour une maître ou une esclave"
 
-#: tiramisu/value.py:433
+#: tiramisu/value.py:507
 msgid "cmp is not permitted in python v3 or greater"
 msgstr "cmp n'est pas permis en python v3 ou supérieure"
 
-#: tiramisu/value.py:442
+#: tiramisu/value.py:516
 msgid "cannot reverse multi option {0} if master or slave"
 msgstr "ne peut inverser une option multi {0} pour une maître ou une esclave"
 
-#: tiramisu/value.py:450
+#: tiramisu/value.py:524
 msgid "cannot insert multi option {0} if master or slave"
 msgstr "ne peut insérer une option multi {0} pour une maître ou une esclave"
 
-#: tiramisu/value.py:458
+#: tiramisu/value.py:532
 msgid "cannot extend multi option {0} if master or slave"
 msgstr "ne peut étendre une option multi {0} pour une maître ou une esclave"
 
-#: tiramisu/value.py:482
+#: tiramisu/value.py:559
 msgid "cannot pop a value on a multi option {0} which is a slave"
 msgstr "ne peut supprimer une valeur dans l'option multi {0} qui est esclave"
 
+#~ msgid "no config specified but needed"
+#~ msgstr "aucune config spécifié alors que c'est nécessaire"
+
+#~ msgid "{0} has no attribute impl_set_information"
+#~ msgstr "{0} n'a pas d'attribut impl_set_information"
+
+#~ msgid "{0} has no attribute impl_get_information"
+#~ msgstr "{0} n'a pas d'attribut impl_get_information"
+
+#~ msgid "invalid name: {0} for optiondescription"
+#~ msgstr "nom invalide : {0} pour l'optiondescription"
+
 #~ msgid "metaconfig's children must be a list"
 #~ msgstr "enfants d'une metaconfig doit être une liste"
 
diff --git a/translations/tiramisu.pot b/translations/tiramisu.pot
index ef40426..8b37d6a 100644
--- a/translations/tiramisu.pot
+++ b/translations/tiramisu.pot
@@ -5,7 +5,7 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
-"POT-Creation-Date: 2013-09-02 11:30+CEST\n"
+"POT-Creation-Date: 2013-09-23 20:59+CEST\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -15,395 +15,411 @@ msgstr ""
 "Generated-By: pygettext.py 1.5\n"
 
 
-#: tiramisu/autolib.py:58
-msgid "no config specified but needed"
-msgstr ""
-
-#: tiramisu/autolib.py:65
+#: tiramisu/autolib.py:131
 msgid "unable to carry out a calculation, option {0} has properties: {1} for: {2}"
 msgstr ""
 
-#: tiramisu/autolib.py:74
+#: tiramisu/autolib.py:140
 msgid "unable to carry out a calculation, option value with multi types must have same length for: {0}"
 msgstr ""
 
-#: tiramisu/config.py:47
+#: tiramisu/config.py:48
 msgid "descr must be an optiondescription, not {0}"
 msgstr ""
 
-#: tiramisu/config.py:121
+#: tiramisu/config.py:122
 msgid "unknown group_type: {0}"
 msgstr ""
 
-#: tiramisu/config.py:157
+#: tiramisu/config.py:158
 msgid "no option description found for this config (may be metaconfig without meta)"
 msgstr ""
 
-#: tiramisu/config.py:311
+#: tiramisu/config.py:313
 msgid "unknown type_ type {0}for _find"
 msgstr ""
 
-#: tiramisu/config.py:350
+#: tiramisu/config.py:352
 msgid "no option found in config with these criteria"
 msgstr ""
 
-#: tiramisu/config.py:400
+#: tiramisu/config.py:402
 msgid "make_dict can't filtering with value without option"
 msgstr ""
 
-#: tiramisu/config.py:421
+#: tiramisu/config.py:423
 msgid "unexpected path {0}, should start with {1}"
 msgstr ""
 
-#: tiramisu/config.py:481
+#: tiramisu/config.py:483
 msgid "opt in getowner must be an option not {0}"
 msgstr ""
 
-#: tiramisu/option.py:71
-msgid "{0} has no attribute impl_set_information"
-msgstr ""
-
-#: tiramisu/option.py:86
-msgid "information's item not found: {0}"
-msgstr ""
-
-#: tiramisu/option.py:89
-msgid "{0} has no attribute impl_get_information"
-msgstr ""
-
-#: tiramisu/option.py:117
-msgid "'{0}' ({1}) object attribute '{2}' is read-only"
-msgstr ""
-
-#: tiramisu/option.py:208
+#: tiramisu/option.py:69
 msgid "invalid name: {0} for option"
 msgstr ""
 
-#: tiramisu/option.py:218
-msgid "validator must be a function"
-msgstr ""
-
-#: tiramisu/option.py:225
-msgid "a default_multi is set whereas multi is False in option: {0}"
-msgstr ""
-
-#: tiramisu/option.py:231
-msgid "invalid default_multi value {0} for option {1}: {2}"
-msgstr ""
-
-#: tiramisu/option.py:236
-msgid "default value not allowed if option: {0} is calculated"
-msgstr ""
-
-#: tiramisu/option.py:239
-msgid "params defined for a callback function but no callback defined yet for option {0}"
-msgstr ""
-
-#: tiramisu/option.py:261 tiramisu/option.py:809
+#: tiramisu/option.py:79
 msgid "invalid properties type {0} for {1}, must be a tuple"
 msgstr ""
 
-#: tiramisu/option.py:334
+#: tiramisu/option.py:121
+msgid "'{0}' ({1}) object attribute '{2}' is read-only"
+msgstr ""
+
+#: tiramisu/option.py:148 tiramisu/value.py:361
+msgid "information's item not found: {0}"
+msgstr ""
+
+#: tiramisu/option.py:265
+msgid "cannot serialize Option, only in OptionDescription"
+msgstr ""
+
+#: tiramisu/option.py:364
+msgid "a default_multi is set whereas multi is False in option: {0}"
+msgstr ""
+
+#: tiramisu/option.py:370
+msgid "invalid default_multi value {0} for option {1}: {2}"
+msgstr ""
+
+#: tiramisu/option.py:375
+msgid "default value not allowed if option: {0} is calculated"
+msgstr ""
+
+#: tiramisu/option.py:378
+msgid "params defined for a callback function but no callback defined yet for option {0}"
+msgstr ""
+
+#: tiramisu/option.py:463
+msgid "validator should return a boolean, not {0}"
+msgstr ""
+
+#: tiramisu/option.py:473
 msgid "invalid value {0} for option {1} for object {2}"
 msgstr ""
 
-#: tiramisu/option.py:342 tiramisu/value.py:468
+#: tiramisu/option.py:481 tiramisu/value.py:542
 msgid "invalid value {0} for option {1}: {2}"
 msgstr ""
 
-#: tiramisu/option.py:354
+#: tiramisu/option.py:493
 msgid "invalid value {0} for option {1} which must be a list"
 msgstr ""
 
-#: tiramisu/option.py:423
+#: tiramisu/option.py:562
 msgid "invalid value {0} for option {1} must be different as {2} option"
 msgstr ""
 
-#: tiramisu/option.py:445
+#: tiramisu/option.py:618
 msgid "values must be a tuple for {0}"
 msgstr ""
 
-#: tiramisu/option.py:448
+#: tiramisu/option.py:621
 msgid "open_values must be a boolean for {0}"
 msgstr ""
 
-#: tiramisu/option.py:469
+#: tiramisu/option.py:642
 msgid "value {0} is not permitted, only {1} is allowed"
 msgstr ""
 
-#: tiramisu/option.py:481
+#: tiramisu/option.py:654
 msgid "value must be a boolean"
 msgstr ""
 
-#: tiramisu/option.py:491
+#: tiramisu/option.py:664
 msgid "value must be an integer"
 msgstr ""
 
-#: tiramisu/option.py:501
+#: tiramisu/option.py:674
 msgid "value must be a float"
 msgstr ""
 
-#: tiramisu/option.py:511
+#: tiramisu/option.py:684
 msgid "value must be a string, not {0}"
 msgstr ""
 
-#: tiramisu/option.py:529
+#: tiramisu/option.py:702
 msgid "value must be an unicode"
 msgstr ""
 
-#: tiramisu/option.py:539
+#: tiramisu/option.py:714
 msgid "malformed symlinkoption must be an option for symlink {0}"
 msgstr ""
 
-#: tiramisu/option.py:581
-msgid "IP shall not be in reserved class"
+#: tiramisu/option.py:766
+msgid "IP mustn't not be in reserved class"
 msgstr ""
 
-#: tiramisu/option.py:583
+#: tiramisu/option.py:768
 msgid "IP must be in private class"
 msgstr ""
 
-#: tiramisu/option.py:621
+#: tiramisu/option.py:806
 msgid "inconsistency in allowed range"
 msgstr ""
 
-#: tiramisu/option.py:626
+#: tiramisu/option.py:811
 msgid "max value is empty"
 msgstr ""
 
-#: tiramisu/option.py:663
+#: tiramisu/option.py:848
 msgid "network shall not be in reserved class"
 msgstr ""
 
-#: tiramisu/option.py:695
+#: tiramisu/option.py:880
 msgid "invalid network {0} ({1}) with netmask {2} ({3}), this network is an IP"
 msgstr ""
 
-#: tiramisu/option.py:700
+#: tiramisu/option.py:885
 msgid "invalid IP {0} ({1}) with netmask {2} ({3}), this IP is a network"
 msgstr ""
 
-#: tiramisu/option.py:705
+#: tiramisu/option.py:890
 msgid "invalid IP {0} ({1}) with netmask {2} ({3})"
 msgstr ""
 
-#: tiramisu/option.py:707
+#: tiramisu/option.py:892
 msgid "invalid network {0} ({1}) with netmask {2} ({3})"
 msgstr ""
 
-#: tiramisu/option.py:727
+#: tiramisu/option.py:912
 msgid "unknown type_ {0} for hostname"
 msgstr ""
 
-#: tiramisu/option.py:730
+#: tiramisu/option.py:915
 msgid "allow_ip must be a boolean"
 msgstr ""
 
-#: tiramisu/option.py:759
+#: tiramisu/option.py:944
 msgid "invalid value for {0}, must have dot"
 msgstr ""
 
-#: tiramisu/option.py:762
+#: tiramisu/option.py:947
 msgid "invalid domainname's length for {0} (max {1})"
 msgstr ""
 
-#: tiramisu/option.py:765
+#: tiramisu/option.py:950
 msgid "invalid domainname's length for {0} (min 2)"
 msgstr ""
 
-#: tiramisu/option.py:769
+#: tiramisu/option.py:954
 msgid "invalid domainname"
 msgstr ""
 
-#: tiramisu/option.py:787
-msgid "invalid name: {0} for optiondescription"
-msgstr ""
-
-#: tiramisu/option.py:799
+#: tiramisu/option.py:981
 msgid "duplicate option name: {0}"
 msgstr ""
 
-#: tiramisu/option.py:825
+#: tiramisu/option.py:998
 msgid "unknown Option {0} in OptionDescription {1}"
 msgstr ""
 
-#: tiramisu/option.py:874
+#: tiramisu/option.py:1049
 msgid "duplicate option: {0}"
 msgstr ""
 
-#: tiramisu/option.py:904
+#: tiramisu/option.py:1083
 msgid "no option for path {0}"
 msgstr ""
 
-#: tiramisu/option.py:910
+#: tiramisu/option.py:1089
 msgid "no option {0} found"
 msgstr ""
 
-#: tiramisu/option.py:920
+#: tiramisu/option.py:1099
 msgid "cannot change group_type if already set (old {0}, new {1})"
 msgstr ""
 
-#: tiramisu/option.py:933
+#: tiramisu/option.py:1112
 msgid "master group {0} shall not have a subgroup"
 msgstr ""
 
-#: tiramisu/option.py:936
+#: tiramisu/option.py:1115
 msgid "master group {0} shall not have a symlinkoption"
 msgstr ""
 
-#: tiramisu/option.py:939
+#: tiramisu/option.py:1118
 msgid "not allowed option {0} in group {1}: this option is not a multi"
 msgstr ""
 
-#: tiramisu/option.py:950
+#: tiramisu/option.py:1129
 msgid "master group with wrong master name for {0}"
 msgstr ""
 
-#: tiramisu/option.py:959
+#: tiramisu/option.py:1138
 msgid "no child has same nom has master group for: {0}"
 msgstr ""
 
-#: tiramisu/option.py:962
+#: tiramisu/option.py:1141
 msgid "group_type: {0} not allowed"
 msgstr ""
 
-#: tiramisu/option.py:1021
+#: tiramisu/option.py:1231
 msgid "malformed requirements type for option: {0}, must be a dict"
 msgstr ""
 
-#: tiramisu/option.py:1037
+#: tiramisu/option.py:1248
 msgid "malformed requirements for option: {0} require must have option, expected and action keys"
 msgstr ""
 
-#: tiramisu/option.py:1042
+#: tiramisu/option.py:1253
 msgid "malformed requirements for option: {0} inverse must be boolean"
 msgstr ""
 
-#: tiramisu/option.py:1046
+#: tiramisu/option.py:1257
 msgid "malformed requirements for option: {0} transitive must be boolean"
 msgstr ""
 
-#: tiramisu/option.py:1050
+#: tiramisu/option.py:1261
 msgid "malformed requirements for option: {0} same_action must be boolean"
 msgstr ""
 
-#: tiramisu/option.py:1054
+#: tiramisu/option.py:1265
 msgid "malformed requirements must be an option in option {0}"
 msgstr ""
 
-#: tiramisu/option.py:1057
+#: tiramisu/option.py:1268
 msgid "malformed requirements option {0} should not be a multi"
 msgstr ""
 
-#: tiramisu/option.py:1063
+#: tiramisu/option.py:1274
 msgid "malformed requirements second argument must be valid for option {0}: {1}"
 msgstr ""
 
-#: tiramisu/option.py:1068
+#: tiramisu/option.py:1279
 msgid "inconsistency in action types for option: {0} action: {1}"
 msgstr ""
 
-#: tiramisu/setting.py:47
-msgid "storage_type is already set, cannot rebind it"
+#: tiramisu/option.py:1304
+msgid "{0} should be a function"
 msgstr ""
 
-#: tiramisu/setting.py:67
+#: tiramisu/option.py:1307
+msgid "{0}_params should be a dict"
+msgstr ""
+
+#: tiramisu/option.py:1310
+msgid "{0}_params with key {1} should not have length different to 1"
+msgstr ""
+
+#: tiramisu/option.py:1314
+msgid "{0}_params should be tuple for key \"{1}\""
+msgstr ""
+
+#: tiramisu/option.py:1320
+msgid "validator not support tuple"
+msgstr ""
+
+#: tiramisu/option.py:1323
+msgid "{0}_params should have an option not a {0} for first argument"
+msgstr ""
+
+#: tiramisu/option.py:1327
+msgid "{0}_params should have a boolean not a {0} for second argument"
+msgstr ""
+
+#: tiramisu/setting.py:116
 msgid "can't rebind {0}"
 msgstr ""
 
-#: tiramisu/setting.py:72
+#: tiramisu/setting.py:121
 msgid "can't unbind {0}"
 msgstr ""
 
-#: tiramisu/setting.py:185
+#: tiramisu/setting.py:259
 msgid "cannot append {0} property for option {1}: this property is calculated"
 msgstr ""
 
-#: tiramisu/setting.py:215
-msgid "option {0} not already exists in storage {1}"
-msgstr ""
-
-#: tiramisu/setting.py:282
+#: tiramisu/setting.py:322
 msgid "opt and all_properties must not be set together in reset"
 msgstr ""
 
-#: tiramisu/setting.py:297
+#: tiramisu/setting.py:337
 msgid "if opt is not None, path should not be None in _getproperties"
 msgstr ""
 
-#: tiramisu/setting.py:391
+#: tiramisu/setting.py:440
 msgid "cannot change the value for option {0} this option is frozen"
 msgstr ""
 
-#: tiramisu/setting.py:397
+#: tiramisu/setting.py:446
 msgid "trying to access to an option named: {0} with properties {1}"
 msgstr ""
 
-#: tiramisu/setting.py:415
+#: tiramisu/setting.py:464
 msgid "permissive must be a tuple"
 msgstr ""
 
-#: tiramisu/setting.py:422 tiramisu/value.py:277
+#: tiramisu/setting.py:471 tiramisu/value.py:300
 msgid "invalid generic owner {0}"
 msgstr ""
 
-#: tiramisu/setting.py:503
+#: tiramisu/setting.py:558
 msgid "malformed requirements imbrication detected for option: '{0}' with requirement on: '{1}'"
 msgstr ""
 
-#: tiramisu/setting.py:515
+#: tiramisu/setting.py:570
 msgid "option '{0}' has requirement's property error: {1} {2}"
 msgstr ""
 
-#: tiramisu/storage/dictionary/storage.py:37
+#: tiramisu/storage/__init__.py:52
+msgid "storage_type is already set, cannot rebind it"
+msgstr ""
+
+#: tiramisu/storage/__init__.py:86
+msgid "option {0} not already exists in storage {1}"
+msgstr ""
+
+#: tiramisu/storage/dictionary/storage.py:39
 msgid "dictionary storage cannot delete session"
 msgstr ""
 
-#: tiramisu/storage/dictionary/storage.py:46
+#: tiramisu/storage/dictionary/storage.py:50
 msgid "session already used"
 msgstr ""
 
-#: tiramisu/storage/dictionary/storage.py:48
+#: tiramisu/storage/dictionary/storage.py:52
 msgid "a dictionary cannot be persistent"
 msgstr ""
 
-#: tiramisu/value.py:284
+#: tiramisu/value.py:307
 msgid "no value for {0} cannot change owner to {1}"
 msgstr ""
 
-#: tiramisu/value.py:356
+#: tiramisu/value.py:414
 msgid "invalid len for the slave: {0} which has {1} as master"
 msgstr ""
 
-#: tiramisu/value.py:373
+#: tiramisu/value.py:438
 msgid "invalid len for the master: {0} which has {1} as slave with greater len"
 msgstr ""
 
-#: tiramisu/value.py:394
+#: tiramisu/value.py:468
 msgid "cannot append a value on a multi option {0} which is a slave"
 msgstr ""
 
-#: tiramisu/value.py:429
+#: tiramisu/value.py:503
 msgid "cannot sort multi option {0} if master or slave"
 msgstr ""
 
-#: tiramisu/value.py:433
+#: tiramisu/value.py:507
 msgid "cmp is not permitted in python v3 or greater"
 msgstr ""
 
-#: tiramisu/value.py:442
+#: tiramisu/value.py:516
 msgid "cannot reverse multi option {0} if master or slave"
 msgstr ""
 
-#: tiramisu/value.py:450
+#: tiramisu/value.py:524
 msgid "cannot insert multi option {0} if master or slave"
 msgstr ""
 
-#: tiramisu/value.py:458
+#: tiramisu/value.py:532
 msgid "cannot extend multi option {0} if master or slave"
 msgstr ""
 
-#: tiramisu/value.py:482
+#: tiramisu/value.py:559
 msgid "cannot pop a value on a multi option {0} which is a slave"
 msgstr ""