diff --git a/doc/config.txt b/doc/config.txt
index 3c6d9bc..f1ab1ce 100644
--- a/doc/config.txt
+++ b/doc/config.txt
@@ -10,8 +10,6 @@ Tiramisu is made of almost three main objects :
 - :class:`tiramisu.option.OptionDescription` is the shema, the option's structure
 - :class:`tiramisu.config.Config` which is the whole configuration entry point
 
-.. image:: config.png
-
 Accessing the `Option`'s
 -------------------------
 
@@ -47,9 +45,13 @@ object is returned, and if no `Option` has been declared in the
 
 The `Option` objects (in this case the :class:`~tiramisu.option.BoolOption`), 
 are organized into a tree into nested 
-:class:`~tiramisu.option.OptionDescription` objects. Every option has a name, 
-as does every option group. The parts of the full name of the option are 
-separated by dots: e.g. ``cfg.optgroup.optname``.
+:class:`~tiramisu.option.OptionDescription` objects. 
+
+.. image:: config.png
+
+Every option has a name, as does every option group. The parts 
+of the full name of the option are separated by dots: e.g. 
+``cfg.optgroup.optname``.
 
 Let's make the protocol of accessing a `Config`'s attribute explicit
 (because explicit is better than implicit):
@@ -362,6 +364,10 @@ read/write or read only mode::
     >>> c.cfgimpl_get_settings().remove('unknown')
     >>> print c.od1.var3
     value 
+
+Many properties can be defined at the same time on an option::
+
+    >>> c.cfgimpl_get_settings().extend(['unknown1', 'unknown2'])
     
 Properties can also be defined on an option group (that is, on an 
 :term:`option description`) let's hide a group and try to access to it::
diff --git a/test/test_cache.py b/test/test_cache.py
index f483c76..e1cd609 100644
--- a/test/test_cache.py
+++ b/test/test_cache.py
@@ -4,7 +4,11 @@ from tiramisu import setting
 setting.expires_time = 1
 from tiramisu.option import IntOption, OptionDescription
 from tiramisu.config import Config
+from tiramisu.error import ConfigError
+
+
 from time import sleep, time
+from py.test import raises
 
 
 def make_description():
@@ -253,3 +257,25 @@ def test_reset_cache_only():
     c.cfgimpl_reset_cache(only=('settings',))
     assert 'u1' in values._p_.get_cached(c)
     assert 'u1' not in settings._p_.get_cached(c)
+
+
+def test_force_cache():
+    u1 = IntOption('u1', '', multi=True)
+    u2 = IntOption('u2', '')
+    u3 = IntOption('u3', '', multi=True)
+    u4 = IntOption('u4', '', properties=('disabled',))
+    od = OptionDescription('od1', '', [u1, u2, u3, u4])
+    c = Config(od)
+    c.cfgimpl_get_settings().remove('expire')
+
+    c.cfgimpl_get_values().force_cache()
+    assert c.cfgimpl_get_values()._p_.get_cached(c) == {'u1': ([], None), 'u3': ([], None), 'u2': (None, None), 'u4': (None, None)}
+    assert c.cfgimpl_get_settings()._p_.get_cached(c) == {'u4': (set(['disabled']), None), 'u1': (set([]), None), 'u3': (set([]), None), 'u2': (set([]), None)}
+    c.read_only()
+
+    c.cfgimpl_get_values().force_cache()
+    assert c.cfgimpl_get_values()._p_.get_cached(c) == {'u1': ([], None), 'u3': ([], None), 'u2': (None, None)}
+    assert c.cfgimpl_get_settings()._p_.get_cached(c) == {'u4': (set(['disabled']), None), 'u1': (set([]), None), 'u3': (set([]), None), 'u2': (set([]), None)}
+
+    c.cfgimpl_get_settings().remove('cache')
+    raises(ConfigError, "c.cfgimpl_get_values().force_cache()")
diff --git a/test/test_config.py b/test/test_config.py
index e091294..8de8a57 100644
--- a/test/test_config.py
+++ b/test/test_config.py
@@ -6,10 +6,11 @@
 import autopath
 from py.test import raises
 
-from tiramisu.config import Config
+from tiramisu.config import Config, SubConfig
 from tiramisu.option import IntOption, FloatOption, StrOption, ChoiceOption, \
     BoolOption, UnicodeOption, OptionDescription
-from tiramisu.error import ConflictError
+from tiramisu.error import ConflictError, ConfigError
+import weakref
 
 
 def make_description():
@@ -131,8 +132,10 @@ def test_cfgimpl_get_home_by_path():
     config.bool = False
     assert config.cfgimpl_get_home_by_path('gc.dummy')[1] == 'dummy'
     assert config.cfgimpl_get_home_by_path('dummy')[1] == 'dummy'
-    #assert config.getpaths(include_groups=False) == ['gc.name', 'gc.dummy', 'gc.float', 'bool', 'objspace', 'wantref', 'str', 'wantframework', 'int', 'boolop']
-    #assert config.getpaths(include_groups=True) == ['gc', 'gc.name', 'gc.dummy', 'gc.float', 'bool', 'objspace', 'wantref', 'str', 'wantframework', 'int', 'boolop']
+
+
+def test_not_valid_properties():
+    raises(TypeError, "stroption = StrOption('str', 'Test string option', default='abc', properties=['mandatory',])")
 
 
 def test_information_config():
@@ -142,6 +145,7 @@ def test_information_config():
     config.impl_set_information('info', string)
     assert config.impl_get_information('info') == string
     raises(ValueError, "config.impl_get_information('noinfo')")
+    assert config.impl_get_information('noinfo', 'default') == 'default'
 
 
 def test_config_impl_get_path_by_opt():
@@ -149,8 +153,10 @@ def test_config_impl_get_path_by_opt():
     config = Config(descr)
     dummy = config.unwrap_from_path('gc.dummy')
     boo = config.unwrap_from_path('bool')
+    unknown = IntOption('test', '')
     assert config.cfgimpl_get_description().impl_get_path_by_opt(boo) == 'bool'
     assert config.cfgimpl_get_description().impl_get_path_by_opt(dummy) == 'gc.dummy'
+    raises(AttributeError, "config.cfgimpl_get_description().impl_get_path_by_opt(unknown)")
 
 
 def test_config_impl_get_opt_by_path():
@@ -160,6 +166,7 @@ def test_config_impl_get_opt_by_path():
     boo = config.unwrap_from_path('bool')
     assert config.cfgimpl_get_description().impl_get_opt_by_path('bool') == boo
     assert config.cfgimpl_get_description().impl_get_opt_by_path('gc.dummy') == dummy
+    raises(AttributeError, "config.cfgimpl_get_description().impl_get_opt_by_path('gc.unknown')")
 
 
 def test_information_display():
@@ -231,8 +238,83 @@ def test_duplicated_option():
     #in different OptionDescription
     raises(ConflictError, "config = Config(root)")
 
+
 def test_cannot_assign_value_to_option_description():
     descr = make_description()
     cfg = Config(descr)
     raises(TypeError, "cfg.gc = 3")
 
+
+def test_config_multi():
+    i1 = IntOption('test1', '', multi=True)
+    i2 = IntOption('test2', '', multi=True, default_multi=1)
+    i3 = IntOption('test3', '', default=[2], multi=True, default_multi=1)
+    od = OptionDescription('test', '', [i1, i2, i3])
+    config = Config(od)
+    assert config.test1 == []
+    assert config.test2 == []
+    config.test2.append()
+    assert config.test2 == [1]
+    assert config.test3 == [2]
+    config.test3.append()
+    assert config.test3 == [2, 1]
+
+
+def test_no_validation():
+    i1 = IntOption('test1', '')
+    od = OptionDescription('test', '', [i1])
+    c = Config(od)
+    setting = c.cfgimpl_get_settings()
+    c.test1 = 1
+    raises(ValueError, 'c.test1 = "yes"')
+    assert c.test1 == 1
+    setting.remove('validator')
+    c.test1 = "yes"
+    assert c.test1 == "yes"
+    setting.append('validator')
+    raises(ValueError, 'c.test1')
+    del(c.test1)
+    assert c.test1 is None
+
+
+def test_delete_config_with_subconfig():
+    test = IntOption('test', '')
+    multi = IntOption('multi', '', multi=True)
+    od = OptionDescription('od', '', [test, multi])
+    odroot = OptionDescription('odroot', '', [od])
+    c = Config(odroot)
+    sub = c.od
+    val = c.cfgimpl_get_values()
+    setting = c.cfgimpl_get_settings()
+    val[test]
+    val[multi]
+    setting[test]
+    sub.make_dict()
+    del(c)
+    raises(ConfigError, 'val[test]')
+    raises(ConfigError, 'val[multi]')
+    raises(ConfigError, 'setting[test]')
+    raises(ConfigError, 'sub.make_dict()')
+
+
+def test_config_weakref():
+    o = OptionDescription('val', '', [])
+    o2 = OptionDescription('val', '', [o])
+    c = Config(o2)
+    SubConfig(o, weakref.ref(c))
+    raises(ValueError, "SubConfig(o, c)")
+    s = SubConfig(o, weakref.ref(c))
+    assert s._cfgimpl_get_context() == c
+    del(c)
+    raises(ConfigError, "s._cfgimpl_get_context()")
+
+
+def test_config_str():
+    gcdummy = BoolOption('dummy', 'dummy', default=False)
+    gcdummy1 = BoolOption('dummy1', 'dummy', default=False, properties=('disabled',))
+    o = OptionDescription('o', '', [gcdummy, gcdummy1])
+    descr = OptionDescription('tiramisu', '', [o])
+    cfg = Config(descr)
+    cfg.read_only()
+    str(cfg)
+    str(cfg.o)
diff --git a/test/test_config_api.py b/test/test_config_api.py
index ab4b484..93f8c95 100644
--- a/test/test_config_api.py
+++ b/test/test_config_api.py
@@ -4,26 +4,34 @@ from py.test import raises
 
 from tiramisu.config import Config
 from tiramisu.option import IntOption, FloatOption, StrOption, ChoiceOption, \
-    BoolOption, OptionDescription
+    BoolOption, FilenameOption, UnicodeOption, SymLinkOption, IPOption, \
+    PortOption, NetworkOption, NetmaskOption, BroadcastOption, \
+    DomainnameOption, OptionDescription
+from tiramisu.error import PropertiesOptionError
 
 
 def make_description():
     gcoption = ChoiceOption('name', 'GC name', ('ref', 'framework'), 'ref')
     gcdummy = BoolOption('dummy', 'dummy', default=False)
+    prop = BoolOption('prop', '', properties=('disabled',))
+    prop2 = BoolOption('prop', '', properties=('hidden',))
     objspaceoption = ChoiceOption('objspace', 'Object space',
                                   ('std', 'thunk'), 'std')
     booloption = BoolOption('bool', 'Test boolean option', default=True)
+    booloption2 = BoolOption('bool', 'Test boolean option', default=False)
     intoption = IntOption('int', 'Test int option', default=0)
+    floatoption2 = FloatOption('float', 'Test float option', default=2.3)
     floatoption = FloatOption('float', 'Test float option', default=2.3)
     stroption = StrOption('str', 'Test string option', default="abc")
     boolop = BoolOption('boolop', 'Test boolean option op', default=True)
     wantref_option = BoolOption('wantref', 'Tests', default=False)
     wantframework_option = BoolOption('wantframework', 'Test', default=False)
-    gcgroup = OptionDescription('gc', '', [gcoption, gcdummy, floatoption])
+    gcgroup2 = OptionDescription('gc2', '', [booloption2, prop])
+    gcgroup = OptionDescription('gc', '', [gcgroup2, gcoption, gcdummy, floatoption, prop2])
     descr = OptionDescription('tiramisu', '', [gcgroup, booloption, objspaceoption,
                                                wantref_option, stroption,
                                                wantframework_option,
-                                               intoption, boolop])
+                                               intoption, boolop, floatoption2])
     return descr
 
 
@@ -62,6 +70,17 @@ def test_iter_config():
         [('string', 'string'), ('string2', 'string2')]
 
 
+def test_iter_config_property():
+    "iteration on config object"
+    s = StrOption("string", "", default="string", properties=('disabled',))
+    s2 = StrOption("string2", "", default="string2")
+    descr = OptionDescription("options", "", [s, s2])
+    config = Config(descr)
+    config.read_only()
+    assert [(name, value) for name, value in config] == \
+        [('string2', 'string2')]
+
+
 def test_iter_subconfig():
     "iteration on config sub object"
     descr = make_description()
@@ -96,24 +115,57 @@ def test_make_dict():
     raises(ValueError, 'd2 = config.make_dict(withvalue="3")')
 
 
+def test_make_dict_with_disabled():
+    descr = OptionDescription("opt", "", [
+        OptionDescription("s1", "", [
+            BoolOption("a", "", default=False),
+            BoolOption("b", "", default=False, properties=('disabled',))]),
+        IntOption("int", "", default=42)])
+    config = Config(descr)
+    config.read_only()
+    d = config.make_dict()
+    assert d == {"s1.a": False, "int": 42}
+
+
 def test_find_in_config():
     "finds option in config"
     descr = make_description()
     conf = Config(descr)
+    conf.read_only()
     assert conf.find(byname='dummy') == [conf.unwrap_from_path('gc.dummy')]
+    assert conf.find(byname='float') == [conf.unwrap_from_path('gc.float'), conf.unwrap_from_path('float')]
+    assert conf.find_first(byname='bool') == conf.unwrap_from_path('gc.gc2.bool')
+    assert conf.find_first(byname='bool', byvalue=True) == conf.unwrap_from_path('bool')
     assert conf.find_first(byname='dummy') == conf.unwrap_from_path('gc.dummy')
+    assert conf.find_first(byname='float') == conf.unwrap_from_path('gc.float')
     assert conf.find(bytype=ChoiceOption) == [conf.unwrap_from_path('gc.name'), conf.unwrap_from_path('objspace')]
     assert conf.find_first(bytype=ChoiceOption) == conf.unwrap_from_path('gc.name')
     assert conf.find(byvalue='ref') == [conf.unwrap_from_path('gc.name')]
     assert conf.find_first(byvalue='ref') == conf.unwrap_from_path('gc.name')
+    assert conf.find(byname='prop') == [conf.unwrap_from_path('gc.prop')]
+    conf.read_write()
+    raises(AttributeError, "assert conf.find(byname='prop')")
+    assert conf.find(byname='prop', check_properties=False) == [conf.unwrap_from_path('gc.gc2.prop'), conf.unwrap_from_path('gc.prop')]
+    #assert conf.find_first(byname='prop') == conf.unwrap_from_path('gc.prop')
     # combinaison of filters
     assert conf.find(bytype=BoolOption, byname='dummy') == [conf.unwrap_from_path('gc.dummy')]
     assert conf.find_first(bytype=BoolOption, byname='dummy') == conf.unwrap_from_path('gc.dummy')
     assert conf.find(byvalue=False, byname='dummy') == [conf.unwrap_from_path('gc.dummy')]
     assert conf.find_first(byvalue=False, byname='dummy') == conf.unwrap_from_path('gc.dummy')
-    ## byattrs
-    #assert conf.find_first(byattrs= dict(default=2.3)) == conf.unwrap_from_path('gc.float')
-    #assert conf.find_first(byvalue=False, byname='dummy', byattrs=dict(default=False)) == conf.unwrap_from_path('gc.dummy')
+    #subconfig
+    assert conf.gc.find(byname='dummy') == [conf.unwrap_from_path('gc.dummy')]
+    assert conf.gc.find(byname='float') == [conf.unwrap_from_path('gc.float')]
+    assert conf.gc.find(byname='bool') == [conf.unwrap_from_path('gc.gc2.bool')]
+    assert conf.gc.find_first(byname='bool', byvalue=False) == conf.unwrap_from_path('gc.gc2.bool')
+    raises(AttributeError, "assert conf.gc.find_first(byname='bool', byvalue=True)")
+    raises(AttributeError, "conf.gc.find(byname='wantref').first()")
+    assert conf.gc.find(byname='prop', check_properties=False) == [conf.unwrap_from_path('gc.gc2.prop'), conf.unwrap_from_path('gc.prop')]
+    conf.read_only()
+    assert conf.gc.find(byname='prop') == [conf.unwrap_from_path('gc.prop')]
+    # not OptionDescription
+    raises(AttributeError, "conf.find_first(byname='gc')")
+    raises(AttributeError, "conf.gc.find_first(byname='gc2')")
+    raises(ValueError, "conf.find(byname='bool', type_='unknown')")
 
 
 def test_find_multi():
@@ -137,3 +189,81 @@ def test_does_not_find_in_config():
     descr = make_description()
     conf = Config(descr)
     raises(AttributeError, "conf.find(byname='IDontExist')")
+
+
+def test_filename():
+    a = FilenameOption('a', '')
+    o = OptionDescription('o', '', [a])
+    c = Config(o)
+    c.a = u'/'
+    c.a = u'/tmp'
+    c.a = u'/tmp/'
+    c.a = u'/tmp/text.txt'
+    c.a = u'tmp'
+    c.a = u'tmp/'
+    c.a = u'tmp/text.txt'
+    raises(ValueError, "c.a = u'/tmp/with space.txt'")
+    raises(ValueError, "c.a = u'/tmp/with$.txt'")
+
+
+def test_iter_all():
+    s = StrOption("string", "", default="string")
+    s2 = StrOption("string2", "", default="string2")
+    descr = OptionDescription("options", "", [s, s2])
+    config = Config(descr)
+    assert list(config.iter_all()) == [('string', 'string'), ('string2', 'string2')]
+    for i in config.iter_all():
+        #test StopIteration
+        break
+
+
+def test_iter_all_prop():
+    s = StrOption("string", "", default="string", properties=('disabled',))
+    s2 = StrOption("string2", "", default="string2")
+    descr = OptionDescription("options", "", [s, s2])
+    config = Config(descr)
+    config.read_only()
+    assert list(config.iter_all()) == [('string2', 'string2')]
+
+
+def test_impl_getpaths():
+    s = StrOption("string", "", default="string", properties=('disabled',))
+    s2 = StrOption("string2", "", default="string2")
+    s3 = StrOption("string3", "", default="string3")
+    s4 = StrOption("string4", "", default="string4", properties=('hidden',))
+    od = OptionDescription('od', '', [s3, s4])
+    descr = OptionDescription("options", "", [s, s2, od])
+    config = Config(descr)
+    assert ['string', 'string2', 'od.string3', 'od.string4'] == config.cfgimpl_get_description().impl_getpaths()
+    assert ['string', 'string2', 'od', 'od.string3', 'od.string4'] == config.cfgimpl_get_description().impl_getpaths(include_groups=True)
+    config.read_write()
+    raises(PropertiesOptionError, "config.od.string4")
+    assert ['string', 'string2', 'od.string3', 'od.string4'] == config.cfgimpl_get_description().impl_getpaths()
+    assert ['string', 'string2', 'od', 'od.string3', 'od.string4'] == config.cfgimpl_get_description().impl_getpaths(include_groups=True)
+
+
+def test_invalid_option():
+    raises(TypeError, "ChoiceOption('a', '', [1, 2])")
+    raises(TypeError, "ChoiceOption('a', '', 1)")
+    raises(TypeError, "ChoiceOption('a', '', (1,), open_values='string')")
+    raises(ValueError, "ChoiceOption('a', '', (1,), 3)")
+    raises(ValueError, "FloatOption('a', '', 'string')")
+    raises(ValueError, "UnicodeOption('a', '', 1)")
+    raises(ValueError, "SymLinkOption('a', 'string')")
+    raises(ValueError, "IPOption('a', '', 1)")
+    raises(ValueError, "IPOption('a', '', 'string')")
+    raises(ValueError, "PortOption('a', '', 'string')")
+    raises(ValueError, "PortOption('a', '', '11:12:13', allow_range=True)")
+    raises(ValueError, "PortOption('a', '', 11111111111111111111)")
+    raises(ValueError, "PortOption('a', '', allow_zero=True, allow_wellknown=False, allow_registred=True, allow_private=False)")
+    raises(ValueError, "PortOption('a', '', allow_zero=True, allow_wellknown=True, allow_registred=False, allow_private=True)")
+    raises(ValueError, "PortOption('a', '', allow_zero=True, allow_wellknown=False, allow_registred=False, allow_private=True)")
+    raises(ValueError, "PortOption('a', '', allow_zero=True, allow_wellknown=False, allow_registred=True, allow_private=True)")
+    raises(ValueError, "PortOption('a', '', allow_zero=False, allow_wellknown=False, allow_registred=False, allow_private=False)")
+    raises(ValueError, "NetworkOption('a', '', 'string')")
+    raises(ValueError, "NetmaskOption('a', '', 'string')")
+    raises(ValueError, "BroadcastOption('a', '', 'string')")
+    raises(ValueError, "DomainnameOption('a', '', 'string')")
+    raises(ValueError, "DomainnameOption('a', '', type_='string')")
+    raises(ValueError, "DomainnameOption('a', '', allow_ip='string')")
+    raises(ValueError, "DomainnameOption('a', '', allow_without_dot='string')")
diff --git a/test/test_config_domain.py b/test/test_config_domain.py
index da04235..bcae92a 100644
--- a/test/test_config_domain.py
+++ b/test/test_config_domain.py
@@ -2,23 +2,47 @@ import autopath
 from py.test import raises
 
 from tiramisu.config import Config
-from tiramisu.option import DomainnameOption, OptionDescription
+from tiramisu.option import DomainnameOption, EmailOption, URLOption, OptionDescription
 
 
 def test_domainname():
     d = DomainnameOption('d', '')
-    e = DomainnameOption('e', '', "toto.com")
-    od = OptionDescription('a', '', [d, e])
+    f = DomainnameOption('f', '', allow_without_dot=True)
+    g = DomainnameOption('g', '', allow_ip=True)
+    od = OptionDescription('a', '', [d, f, g])
     c = Config(od)
     c.read_write()
     c.d = 'toto.com'
     raises(ValueError, "c.d = 'toto'")
     c.d = 'toto3.com'
-    c.d = 'toto3.3la'
-    raises(ValueError, "c.d = '3toto.com'")
-    c.d = 'toto.co3'
+    raises(ValueError, "c.d = 'toto3.3la'")
+    #raises(ValueError, "c.d = '3toto.com'")
+    raises(ValueError, "c.d = 'toto.co3'")
     raises(ValueError, "c.d = 'toto_super.com'")
     c.d = 'toto-.com'
+    raises(ValueError, "c.d = 'toto..com'")
+    #
+    c.f = 'toto.com'
+    c.f = 'toto'
+    raises(ValueError, "c.f = 'domainnametoolongthathavemorethanmaximumsizeforatruedomainnameanditsnoteasytogeneratesolongdomainnamewithoutrepeatdomainnametoolongthathavemorethanmaximumsizeforatruedomainnameanditsnoteasytogeneratesolongdomainnamewithoutrepeatbutimnotabletodoitnowiendityeah'")
+    raises(ValueError, "c.f = 'd'")
+    #
+    c.g = 'toto.com'
+    c.g = '192.168.1.0'
+    c.g = '192.168.1.29'
+
+def test_special_domain_name():
+    """domain name option that starts with a number or not
+    """
+    d = DomainnameOption('d', '')
+    e = DomainnameOption('e', '', type_='netbios')
+    od = OptionDescription('a', '', [d,e])
+    c = Config(od)
+    c.read_write()
+    c.d = '1toto.com'
+    c.d = '123toto.com'
+    c.e = 'toto'
+    raises(ValueError, "c.e = '1toto'")
 
 
 def test_domainname_netbios():
@@ -41,3 +65,35 @@ def test_domainname_hostname():
     raises(ValueError, "c.d = 'toto.com'")
     c.d = 'toto'
     c.d = 'domainnametoolong'
+
+
+def test_email():
+    e = EmailOption('e', '')
+    od = OptionDescription('a', '', [e])
+    c = Config(od)
+    c.read_write()
+    c.e = 'root@foo.com'
+    raises(ValueError, "c.e = 'root'")
+    raises(ValueError, "c.e = 'root@domain'")
+    raises(ValueError, "c.e = 'root[]@domain'")
+
+
+def test_url():
+    u = URLOption('u', '')
+    od = OptionDescription('a', '', [u])
+    c = Config(od)
+    c.read_write()
+    c.u = 'http://foo.com'
+    c.u = 'https://foo.com'
+    c.u = 'https://foo.com/'
+    raises(ValueError, "c.u = 'ftp://foo.com'")
+    raises(ValueError, "c.u = 'foo.com'")
+    raises(ValueError, "c.u = ':/foo.com'")
+    raises(ValueError, "c.u = 'foo.com/http://'")
+    c.u = 'https://foo.com/index.html'
+    c.u = 'https://foo.com/index.html?var=value&var2=val2'
+    raises(ValueError, "c.u = 'https://foo.com/index\\n.html'")
+    c.u = 'https://foo.com:8443'
+    c.u = 'https://foo.com:8443/'
+    c.u = 'https://foo.com:8443/index.html'
+    raises(ValueError, "c.u = 'https://foo.com:84438989'")
diff --git a/test/test_config_ip.py b/test/test_config_ip.py
index b7d3010..581cbd2 100644
--- a/test/test_config_ip.py
+++ b/test/test_config_ip.py
@@ -21,6 +21,11 @@ def test_ip():
     c.b = '0.0.0.0'
     raises(ValueError, "c.b = '255.255.255.0'")
 
+    raises(ValueError, "IPOption('a', 'ip', default='192.000.023.01')")
+    d = IPOption('a', 'ip', default='192.0.23.1')
+    od = OptionDescription('od', '', [d])
+    c = Config(od)
+    raises(ValueError, "c.a = '192.000.023.01'")
 
 def test_ip_default():
     a = IPOption('a', '', '88.88.88.88')
diff --git a/test/test_dereference.py b/test/test_dereference.py
index be8dfde..358c1b9 100644
--- a/test/test_dereference.py
+++ b/test/test_dereference.py
@@ -2,8 +2,8 @@
 import autopath
 #from py.test import raises
 
-from tiramisu.config import Config
-from tiramisu.option import BoolOption, OptionDescription
+from tiramisu.config import Config, GroupConfig, MetaConfig
+from tiramisu.option import BoolOption, IntOption, OptionDescription
 import weakref
 
 
@@ -109,3 +109,31 @@ def test_deref_optiondescription_config():
     assert w() is not None
     del(c)
     assert w() is None
+
+
+def test_deref_groupconfig():
+    i1 = IntOption('i1', '')
+    od1 = OptionDescription('od1', '', [i1])
+    od2 = OptionDescription('od2', '', [od1])
+    conf1 = Config(od2)
+    conf2 = Config(od2)
+    meta = GroupConfig([conf1, conf2])
+    w = weakref.ref(conf1)
+    del(conf1)
+    assert w() is not None
+    del(meta)
+    assert w() is None
+
+
+def test_deref_metaconfig():
+    i1 = IntOption('i1', '')
+    od1 = OptionDescription('od1', '', [i1])
+    od2 = OptionDescription('od2', '', [od1])
+    conf1 = Config(od2)
+    conf2 = Config(od2)
+    meta = MetaConfig([conf1, conf2])
+    w = weakref.ref(conf1)
+    del(conf1)
+    assert w() is not None
+    del(meta)
+    assert w() is None
diff --git a/test/test_mandatory.py b/test/test_mandatory.py
index c535e31..5b9878a 100644
--- a/test/test_mandatory.py
+++ b/test/test_mandatory.py
@@ -1,7 +1,7 @@
 import autopath
 
 #from py.test import raises
-from tiramisu.config import Config, mandatory_warnings
+from tiramisu.config import Config
 from tiramisu.option import StrOption, UnicodeOption, OptionDescription
 from tiramisu.error import PropertiesOptionError
 
@@ -205,11 +205,11 @@ def test_mandatory_warnings_ro():
     except PropertiesOptionError as err:
         proc = err.proptype
     assert proc == ['mandatory']
-    assert list(mandatory_warnings(config)) == ['str', 'str1', 'unicode2', 'str3']
+    assert list(config.cfgimpl_get_values().mandatory_warnings()) == ['str', 'str1', 'unicode2', 'str3']
     config.read_write()
     config.str = 'a'
     config.read_only()
-    assert list(mandatory_warnings(config)) == ['str1', 'unicode2', 'str3']
+    assert list(config.cfgimpl_get_values().mandatory_warnings()) == ['str1', 'unicode2', 'str3']
 
 
 def test_mandatory_warnings_rw():
@@ -218,9 +218,9 @@ def test_mandatory_warnings_rw():
     config.str = ''
     config.read_write()
     config.str
-    assert list(mandatory_warnings(config)) == ['str', 'str1', 'unicode2', 'str3']
+    assert list(config.cfgimpl_get_values().mandatory_warnings()) == ['str', 'str1', 'unicode2', 'str3']
     config.str = 'a'
-    assert list(mandatory_warnings(config)) == ['str1', 'unicode2', 'str3']
+    assert list(config.cfgimpl_get_values().mandatory_warnings()) == ['str1', 'unicode2', 'str3']
 
 
 def test_mandatory_warnings_disabled():
@@ -230,9 +230,9 @@ def test_mandatory_warnings_disabled():
     setting = config.cfgimpl_get_settings()
     config.read_write()
     config.str
-    assert list(mandatory_warnings(config)) == ['str', 'str1', 'unicode2', 'str3']
+    assert list(config.cfgimpl_get_values().mandatory_warnings()) == ['str', 'str1', 'unicode2', 'str3']
     setting[descr.str].append('disabled')
-    assert list(mandatory_warnings(config)) == ['str1', 'unicode2', 'str3']
+    assert list(config.cfgimpl_get_values().mandatory_warnings()) == ['str1', 'unicode2', 'str3']
 
 
 def test_mandatory_warnings_frozen():
@@ -242,7 +242,7 @@ def test_mandatory_warnings_frozen():
     setting = config.cfgimpl_get_settings()
     config.read_write()
     config.str
-    assert list(mandatory_warnings(config)) == ['str', 'str1', 'unicode2', 'str3']
+    assert list(config.cfgimpl_get_values().mandatory_warnings()) == ['str', 'str1', 'unicode2', 'str3']
     setting[descr.str].append('frozen')
     config.read_only()
-    assert list(mandatory_warnings(config)) == ['str', 'str1', 'unicode2', 'str3']
+    assert list(config.cfgimpl_get_values().mandatory_warnings()) == ['str', 'str1', 'unicode2', 'str3']
diff --git a/test/test_metaconfig.py b/test/test_metaconfig.py
index 35d65d5..a8fc395 100644
--- a/test/test_metaconfig.py
+++ b/test/test_metaconfig.py
@@ -1,172 +1,203 @@
-#import autopath
+import autopath
 
-#from py.test import raises
+from py.test import raises
 
-#from tiramisu.setting import owners
-#from tiramisu.config import Config, MetaConfig
-#from tiramisu.option import IntOption, OptionDescription
-#from tiramisu.error import ConfigError
+from tiramisu.setting import owners
+from tiramisu.config import Config, GroupConfig, MetaConfig
+from tiramisu.option import IntOption, OptionDescription
+from tiramisu.error import ConfigError, PropertiesOptionError
 
-#owners.addowner('meta')
+owners.addowner('meta')
 
 
-#def make_description():
-#    i1 = IntOption('i1', '')
-#    i2 = IntOption('i2', '', default=1)
-#    i3 = IntOption('i3', '')
-#    i4 = IntOption('i4', '', default=2)
-#    od1 = OptionDescription('od1', '', [i1, i2, i3, i4])
-#    od2 = OptionDescription('od2', '', [od1])
-#    conf1 = Config(od2)
-#    conf2 = Config(od2)
-#    meta = MetaConfig([conf1, conf2])
-#    meta.cfgimpl_get_settings().setowner(owners.meta)
-#    return meta
+def make_description():
+    i1 = IntOption('i1', '')
+    i2 = IntOption('i2', '', default=1)
+    i3 = IntOption('i3', '')
+    i4 = IntOption('i4', '', default=2)
+    i5 = IntOption('i5', '', default=[2], multi=True)
+    i6 = IntOption('i6', '', properties=('disabled',))
+    od1 = OptionDescription('od1', '', [i1, i2, i3, i4, i5, i6])
+    od2 = OptionDescription('od2', '', [od1])
+    conf1 = Config(od2)
+    conf2 = Config(od2)
+    conf1.read_write()
+    conf2.read_write()
+    meta = MetaConfig([conf1, conf2])
+    meta.cfgimpl_get_settings().setowner(owners.meta)
+    return meta
 
 
-##FIXME ne pas mettre 2 meta dans une config
-##FIXME ne pas mettre 2 OD differents dans un meta
-#def test_none():
-#    meta = make_description()
-#    conf1, conf2 = meta._impl_children
-#    assert conf1.od1.i3 is conf2.od1.i3 is None
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i3')) is conf2.getowner(conf2.unwrap_from_path('od1.i3')) is owners.default
-#    meta.od1.i3 = 3
-#    assert conf1.od1.i3 == conf2.od1.i3 == 3
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i3')) is conf2.getowner(conf2.unwrap_from_path('od1.i3')) is owners.meta
-#    meta.od1.i3 = 3
-#    conf1.od1.i3 = 2
-#    assert conf1.od1.i3 == 2
-#    assert conf2.od1.i3 == 3
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i3')) is owners.user
-#    assert conf2.getowner(conf2.unwrap_from_path('od1.i3')) is owners.meta
-#    meta.od1.i3 = 4
-#    assert conf1.od1.i3 == 2
-#    assert conf2.od1.i3 == 4
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i3')) is owners.user
-#    assert conf2.getowner(conf2.unwrap_from_path('od1.i3')) is owners.meta
-#    del(meta.od1.i3)
-#    assert conf1.od1.i3 == 2
-#    assert conf2.od1.i3 is None
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i3')) is owners.user
-#    assert conf2.getowner(conf2.unwrap_from_path('od1.i3')) is owners.default
-#    del(conf1.od1.i3)
-#    assert conf1.od1.i3 is conf2.od1.i3 is None
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i3')) is conf2.getowner(conf2.unwrap_from_path('od1.i3')) is owners.default
+#FIXME ne pas mettre 2 meta dans une config
+#FIXME ne pas mettre 2 OD differents dans un meta
+#FIXME serialization
+def test_none():
+    meta = make_description()
+    conf1, conf2 = meta.cfgimpl_get_children()
+    assert conf1.od1.i3 is conf2.od1.i3 is None
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i3')) is conf2.getowner(conf2.unwrap_from_path('od1.i3')) is owners.default
+    meta.od1.i3 = 3
+    assert conf1.od1.i3 == conf2.od1.i3 == 3
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i3')) is conf2.getowner(conf2.unwrap_from_path('od1.i3')) is owners.meta
+    meta.od1.i3 = 3
+    conf1.od1.i3 = 2
+    assert conf1.od1.i3 == 2
+    assert conf2.od1.i3 == 3
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i3')) is owners.user
+    assert conf2.getowner(conf2.unwrap_from_path('od1.i3')) is owners.meta
+    meta.od1.i3 = 4
+    assert conf1.od1.i3 == 2
+    assert conf2.od1.i3 == 4
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i3')) is owners.user
+    assert conf2.getowner(conf2.unwrap_from_path('od1.i3')) is owners.meta
+    del(meta.od1.i3)
+    assert conf1.od1.i3 == 2
+    assert conf2.od1.i3 is None
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i3')) is owners.user
+    assert conf2.getowner(conf2.unwrap_from_path('od1.i3')) is owners.default
+    del(conf1.od1.i3)
+    assert conf1.od1.i3 is conf2.od1.i3 is None
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i3')) is conf2.getowner(conf2.unwrap_from_path('od1.i3')) is owners.default
 
 
-#def test_default():
-#    meta = make_description()
-#    conf1, conf2 = meta._impl_children
-#    assert conf1.od1.i2 == conf2.od1.i2 == 1
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.default
-#    meta.od1.i2 = 3
-#    assert conf1.od1.i2 == conf2.od1.i2 == 3
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.meta
-#    meta.od1.i2 = 3
-#    conf1.od1.i2 = 2
-#    assert conf1.od1.i2 == 2
-#    assert conf2.od1.i2 == 3
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is owners.user
-#    assert conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.meta
-#    meta.od1.i2 = 4
-#    assert conf1.od1.i2 == 2
-#    assert conf2.od1.i2 == 4
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is owners.user
-#    assert conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.meta
-#    del(meta.od1.i2)
-#    assert conf1.od1.i2 == 2
-#    assert conf2.od1.i2 == 1
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is owners.user
-#    assert conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.default
-#    del(conf1.od1.i2)
-#    assert conf1.od1.i2 == conf2.od1.i2 == 1
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.default
+def test_default():
+    meta = make_description()
+    conf1, conf2 = meta.cfgimpl_get_children()
+    assert conf1.od1.i2 == conf2.od1.i2 == 1
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.default
+    meta.od1.i2 = 3
+    assert conf1.od1.i2 == conf2.od1.i2 == 3
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.meta
+    meta.od1.i2 = 3
+    conf1.od1.i2 = 2
+    assert conf1.od1.i2 == 2
+    assert conf2.od1.i2 == 3
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is owners.user
+    assert conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.meta
+    meta.od1.i2 = 4
+    assert conf1.od1.i2 == 2
+    assert conf2.od1.i2 == 4
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is owners.user
+    assert conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.meta
+    del(meta.od1.i2)
+    assert conf1.od1.i2 == 2
+    assert conf2.od1.i2 == 1
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is owners.user
+    assert conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.default
+    del(conf1.od1.i2)
+    assert conf1.od1.i2 == conf2.od1.i2 == 1
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.default
 
 
-#def test_contexts():
-#    meta = make_description()
-#    conf1, conf2 = meta._impl_children
-#    assert conf1.od1.i2 == conf2.od1.i2 == 1
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.default
-#    meta.set_contexts('od1.i2', 6)
-#    assert meta.od1.i2 == 1
-#    assert conf1.od1.i2 == conf2.od1.i2 == 6
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.user
+def test_contexts():
+    meta = make_description()
+    conf1, conf2 = meta.cfgimpl_get_children()
+    assert conf1.od1.i2 == conf2.od1.i2 == 1
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.default
+    meta.setattrs('od1.i2', 6)
+    assert meta.od1.i2 == 1
+    assert conf1.od1.i2 == conf2.od1.i2 == 6
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.user
 
 
-#def test_find():
-#    meta = make_description()
-#    i2 = meta.unwrap_from_path('od1.i2')
-#    assert [i2] == meta.find(byname='i2')
-#    assert i2 == meta.find_first(byname='i2')
-#    assert meta.make_dict() == {'od1.i4': 2, 'od1.i1': None, 'od1.i3': None, 'od1.i2': 1}
+def test_find():
+    meta = make_description()
+    i2 = meta.unwrap_from_path('od1.i2')
+    assert [i2] == meta.find(byname='i2')
+    assert i2 == meta.find_first(byname='i2')
+    assert meta.make_dict() == {'od1.i4': 2, 'od1.i1': None, 'od1.i3': None,
+                                'od1.i2': 1, 'od1.i5': [2], 'od1.i6': None}
 
 
-#def test_meta_meta():
-#    meta1 = make_description()
-#    meta2 = MetaConfig([meta1])
-#    meta2.cfgimpl_get_settings().setowner(owners.meta)
-#    conf1, conf2 = meta1._impl_children
-#    assert conf1.od1.i2 == conf2.od1.i2 == 1
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.default
-#    meta2.od1.i2 = 3
-#    assert conf1.od1.i2 == conf2.od1.i2 == 3
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.meta
-#    meta2.od1.i2 = 3
-#    conf1.od1.i2 = 2
-#    assert conf1.od1.i2 == 2
-#    assert conf2.od1.i2 == 3
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is owners.user
-#    assert conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.meta
-#    meta2.od1.i2 = 4
-#    assert conf1.od1.i2 == 2
-#    assert conf2.od1.i2 == 4
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is owners.user
-#    assert conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.meta
-#    del(meta2.od1.i2)
-#    assert conf1.od1.i2 == 2
-#    assert conf2.od1.i2 == 1
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is owners.user
-#    assert conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.default
-#    del(conf1.od1.i2)
-#    assert conf1.od1.i2 == conf2.od1.i2 == 1
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.default
-#    meta1.od1.i2 = 6
-#    assert conf1.od1.i2 == conf2.od1.i2 == 6
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.meta
+def test_meta_meta():
+    meta1 = make_description()
+    meta2 = MetaConfig([meta1])
+    meta2.cfgimpl_get_settings().setowner(owners.meta)
+    conf1, conf2 = meta1.cfgimpl_get_children()
+    assert conf1.od1.i2 == conf2.od1.i2 == 1
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.default
+    meta2.od1.i2 = 3
+    assert conf1.od1.i2 == conf2.od1.i2 == 3
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.meta
+    meta2.od1.i2 = 3
+    conf1.od1.i2 = 2
+    assert conf1.od1.i2 == 2
+    assert conf2.od1.i2 == 3
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is owners.user
+    assert conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.meta
+    meta2.od1.i2 = 4
+    assert conf1.od1.i2 == 2
+    assert conf2.od1.i2 == 4
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is owners.user
+    assert conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.meta
+    del(meta2.od1.i2)
+    assert conf1.od1.i2 == 2
+    assert conf2.od1.i2 == 1
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is owners.user
+    assert conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.default
+    del(conf1.od1.i2)
+    assert conf1.od1.i2 == conf2.od1.i2 == 1
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.default
+    meta1.od1.i2 = 6
+    assert conf1.od1.i2 == conf2.od1.i2 == 6
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i2')) is conf2.getowner(conf2.unwrap_from_path('od1.i2')) is owners.meta
 
 
-#def test_meta_meta_set():
-#    meta1 = make_description()
-#    meta2 = MetaConfig([meta1])
-#    meta2.cfgimpl_get_settings().setowner(owners.meta)
-#    conf1, conf2 = meta1._impl_children
-#    meta2.set_contexts('od1.i1', 7)
-#    assert conf1.od1.i1 == conf2.od1.i1 == 7
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i1')) is conf2.getowner(conf2.unwrap_from_path('od1.i1')) is owners.user
-#    assert [conf1, conf2] == meta2.find_first_contexts(byname='i1', byvalue=7)
-#    conf1.od1.i1 = 8
-#    assert [conf2] == meta2.find_first_contexts(byname='i1', byvalue=7)
-#    assert [conf1] == meta2.find_first_contexts(byname='i1', byvalue=8)
-#    raises(AttributeError, "meta2.find_first_contexts(byname='i1', byvalue=10)")
+def test_meta_meta_set():
+    meta1 = make_description()
+    meta2 = MetaConfig([meta1])
+    meta2.cfgimpl_get_settings().setowner(owners.meta)
+    conf1, conf2 = meta1.cfgimpl_get_children()
+    meta2.setattrs('od1.i1', 7)
+    #PropertiesOptionError
+    meta2.setattrs('od1.i6', 7)
+    assert conf1.od1.i1 == conf2.od1.i1 == 7
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i1')) is conf2.getowner(conf2.unwrap_from_path('od1.i1')) is owners.user
+    assert [conf1, conf2] == meta2.find_firsts(byname='i1', byvalue=7)
+    conf1.od1.i1 = 8
+    assert [conf1, conf2] == meta2.find_firsts(byname='i1')
+    assert [conf2] == meta2.find_firsts(byname='i1', byvalue=7)
+    assert [conf1] == meta2.find_firsts(byname='i1', byvalue=8)
+    assert [conf1, conf2] == meta2.find_firsts(byname='i5', byvalue=2)
+    raises(AttributeError, "meta2.find_firsts(byname='i1', byvalue=10)")
+    raises(AttributeError, "meta2.find_firsts(byname='not', byvalue=10)")
+    raises(AttributeError, "meta2.find_firsts(byname='i6')")
 
 
-#def test_not_meta():
-#    i1 = IntOption('i1', '')
-#    od1 = OptionDescription('od1', '', [i1])
-#    od2 = OptionDescription('od2', '', [od1])
-#    conf1 = Config(od2)
-#    conf2 = Config(od2)
-#    meta = MetaConfig([conf1, conf2], False)
-#    raises(ConfigError, 'meta.od1.i1')
-#    conf1, conf2 = meta._impl_children
-#    meta.set_contexts('od1.i1', 7)
-#    assert conf1.od1.i1 == conf2.od1.i1 == 7
-#    assert conf1.getowner(conf1.unwrap_from_path('od1.i1')) is conf2.getowner(conf2.unwrap_from_path('od1.i1')) is owners.user
+def test_not_meta():
+    i1 = IntOption('i1', '')
+    od1 = OptionDescription('od1', '', [i1])
+    od2 = OptionDescription('od2', '', [od1])
+    conf1 = Config(od2)
+    conf2 = Config(od2)
+    raises(ValueError, "GroupConfig(conf1)")
+    meta = GroupConfig([conf1, conf2])
+    raises(ConfigError, 'meta.od1.i1')
+    conf1, conf2 = meta.cfgimpl_get_children()
+    meta.setattrs('od1.i1', 7)
+    assert conf1.od1.i1 == conf2.od1.i1 == 7
+    assert conf1.getowner(conf1.unwrap_from_path('od1.i1')) is conf2.getowner(conf2.unwrap_from_path('od1.i1')) is owners.user
 
 
-#def test_meta_path():
-#    meta = make_description()
-#    assert meta._impl_path is None
-#    assert meta.od1._impl_path == 'od1'
+def test_meta_path():
+    meta = make_description()
+    assert meta._impl_path is None
+    assert meta.od1._impl_path == 'od1'
+
+
+def test_meta_unconsistent():
+    i1 = IntOption('i1', '')
+    i2 = IntOption('i2', '', default=1)
+    i3 = IntOption('i3', '')
+    i4 = IntOption('i4', '', default=2)
+    od1 = OptionDescription('od1', '', [i1, i2, i3, i4])
+    od2 = OptionDescription('od2', '', [od1])
+    conf1 = Config(od2)
+    conf2 = Config(od2)
+    conf3 = Config(od2)
+    conf4 = Config(od1)
+    meta = MetaConfig([conf1, conf2])
+    meta.cfgimpl_get_settings().setowner(owners.meta)
+    raises(TypeError, 'MetaConfig("string")')
+    raises(ValueError, "MetaConfig([conf1, conf3])")
+    raises(ValueError, "MetaConfig([conf3, conf4])")
diff --git a/test/test_multi.py b/test/test_multi.py
new file mode 100644
index 0000000..42fd8e1
--- /dev/null
+++ b/test/test_multi.py
@@ -0,0 +1,21 @@
+# coding: utf-8
+import autopath
+from tiramisu.value import Multi
+from tiramisu.option import IntOption, OptionDescription
+from tiramisu.config import Config
+from tiramisu.error import ConfigError
+
+import weakref
+from py.test import raises
+
+
+def test_multi():
+    i = IntOption('int', '', multi=True)
+    o = OptionDescription('od', '', [i])
+    c = Config(o)
+    multi = Multi([1,2,3], weakref.ref(c), i, 'int')
+    raises(ValueError, "Multi([1,2,3], c, i, 'int')")
+    raises(ValueError, "Multi(multi, weakref.ref(c), i, 'int')")
+    assert c is multi._getcontext()
+    del(c)
+    raises(ConfigError, "multi._getcontext()")
diff --git a/test/test_option.py b/test/test_option.py
index 0492ed2..ec769c5 100644
--- a/test/test_option.py
+++ b/test/test_option.py
@@ -2,8 +2,13 @@
 and to compare them
 """
 import autopath
+from py.test import raises
 
-from tiramisu.option import BoolOption, IntOption
+from tiramisu.option import IntOption, OptionDescription
+
+
+def a_func():
+    return None
 
 
 #def test_option_comparison():
@@ -36,3 +41,60 @@ from tiramisu.option import BoolOption, IntOption
 #    assert dummy1 != dummy5
 #    assert dummy1 == dummy6
 #    assert dummy1 != dummy7
+
+
+def test_option_valid_name():
+    IntOption('test', '')
+    raises(ValueError, 'IntOption(1, "")')
+    raises(ValueError, 'IntOption("impl_test", "")')
+    raises(ValueError, 'IntOption("_test", "")')
+    raises(ValueError, 'IntOption("unwrap_from_path", "")')
+
+
+def test_option_with_callback():
+    #no default value with callback
+    raises(ValueError, "IntOption('test', '', default=1, callback=a_func)")
+
+
+def test_option_get_information():
+    description = "it's ok"
+    string = 'some informations'
+    i = IntOption('test', description)
+    i.impl_set_information('info', string)
+    assert i.impl_get_information('info') == string
+    raises(ValueError, "i.impl_get_information('noinfo')")
+    assert i.impl_get_information('noinfo', 'default') == 'default'
+    assert i.impl_get_information('doc') == description
+    assert i.impl_getdoc() == description
+
+
+def test_optiondescription_get_information():
+    description = "it's ok"
+    string = 'some informations'
+    o = OptionDescription('test', description, [])
+    o.impl_set_information('info', string)
+    assert o.impl_get_information('info') == string
+    raises(ValueError, "o.impl_get_information('noinfo')")
+    assert o.impl_get_information('noinfo', 'default') == 'default'
+    assert o.impl_get_information('doc') == description
+    assert o.impl_getdoc() == description
+
+
+def test_option_multi():
+    IntOption('test', '', multi=True)
+    IntOption('test', '', multi=True, default_multi=1)
+    IntOption('test', '', default=[1], multi=True, default_multi=1)
+    #add default_multi to not multi's option
+    raises(ValueError, "IntOption('test', '', default_multi=1)")
+    #unvalid default_multi
+    raises(ValueError, "IntOption('test', '', multi=True, default_multi='yes')")
+    #not default_multi with callback
+    raises(ValueError, "IntOption('test', '', multi=True, default_multi=1, callback=a_func)")
+
+
+def test_option_is_multi_by_default():
+    assert IntOption('test', '').impl_is_empty_by_default() is True
+    assert IntOption('test', '', 1).impl_is_empty_by_default() is False
+    assert IntOption('test', '', multi=True).impl_is_empty_by_default() is True
+    assert IntOption('test', '', [1], multi=True).impl_is_empty_by_default() is False
+    assert IntOption('test', '', multi=True, default_multi=1).impl_is_empty_by_default() is True
diff --git a/test/test_option_calculation.py b/test/test_option_calculation.py
index 117de9d..89f9291 100644
--- a/test/test_option_calculation.py
+++ b/test/test_option_calculation.py
@@ -21,7 +21,13 @@ def return_list(value=None):
 
 
 def return_list2(*args):
-    return list(args)
+    l = []
+    for arg in args:
+        if isinstance(arg, list):
+            l.extend(arg)
+        else:
+            l.append(arg)
+    return l
 
 
 def return_value(value=None):
@@ -34,6 +40,10 @@ def return_value2(*args, **kwargs):
     return value
 
 
+def return_calc(i, j, k):
+    return i + j + k
+
+
 def make_description():
     gcoption = ChoiceOption('name', 'GC name', ('ref', 'framework'), 'ref')
     gcdummy = BoolOption('dummy', 'dummy', default=False)
@@ -93,83 +103,6 @@ def test_identical_paths():
     raises(ConflictError, "make_description_duplicates()")
 
 
-def make_description2():
-    gcoption = ChoiceOption('name', 'GC name', ['ref', 'framework'], 'ref')
-    gcdummy = BoolOption('dummy', 'dummy', default=False)
-
-    floatoption = FloatOption('float', 'Test float option', default=2.3)
-
-    objspaceoption = ChoiceOption('objspace', 'Object space',
-                                  ['std', 'thunk'], 'std')
-    booloption = BoolOption('bool', 'Test boolean option', default=True)
-    intoption = IntOption('int', 'Test int option', default=0)
-    stroption = StrOption('str', 'Test string option', default="abc")
-    # first multi
-    boolop = BoolOption('boolop', 'Test boolean option op', default=True)
-    boolop.enable_multi()
-    wantref_option = BoolOption('wantref', 'Test requires', default=False,
-                                requires=({'option': boolop, 'expected': True, 'action': 'hidden'},))
-    # second multi
-    wantframework_option = BoolOption('wantframework', 'Test requires',
-                                      default=False,
-                                      requires=({'option': boolop, 'expected': True, 'action': 'hidden'},))
-    wantframework_option.enable_multi()
-
-    gcgroup = OptionDescription('gc', '', [gcoption, gcdummy, floatoption])
-    descr = OptionDescription('constraints', '', [gcgroup, booloption, objspaceoption,
-                              wantref_option, stroption,
-                              wantframework_option,
-                              intoption, boolop])
-    return descr
-
-
-# FIXME: il faudra tester les validations sur les multis
-#def test_multi_constraints():
-#    "a multi in a constraint has to have the same length"
-#    descr = make_description2()
-#    cfg = Config(descr)
-#    cfg.boolop = [True, True, False]
-#    cfg.wantframework = [False, False, True]
-#
-#def test_multi_raise():
-#    "a multi in a constraint has to have the same length"
-#    # FIXME fusionner les deux tests, MAIS PROBLEME :
-#    # il ne devrait pas etre necessaire de refaire une config
-#    # si la valeur est modifiee une deuxieme fois ->
-#    #raises(ConflictConfigError, "cfg.wantframework = [False, False, True]")
-#    #   ExceptionFailure: 'DID NOT RAISE'
-#    descr = make_description2()
-#    cfg = Config(descr)
-#    cfg.boolop = [True]
-#    raises(ConflictConfigError, "cfg.wantframework = [False, False, True]")
-# ____________________________________________________________
-# adding dynamically new options description schema
-#def test_newoption_add_in_descr():
-#    descr = make_description()
-#    newoption = BoolOption('newoption', 'dummy twoo', default=False)
-#    descr.add_child(newoption)
-#    config = Config(descr)
-#    assert config.newoption == False
-
-#def test_newoption_add_in_subdescr():
-#    descr = make_description()
-#    newoption = BoolOption('newoption', 'dummy twoo', default=False)
-#    descr.gc.add_child(newoption)
-#    config = Config(descr)
-#    config.bool = False
-#    assert config.gc.newoption == False
-
-#def test_newoption_add_in_config():
-#    descr = make_description()
-#    config = Config(descr)
-#    config.bool = False
-#    newoption = BoolOption('newoption', 'dummy twoo', default=False)
-#    descr.add_child(newoption)
-#    config.cfgimpl_update()
-#    assert config.newoption == False
-# ____________________________________________________________
-
-
 def make_description_requires():
     gcoption = ChoiceOption('name', 'GC name', ('ref', 'framework'), 'ref')
     gcdummy = BoolOption('dummy', 'dummy', default=False)
@@ -310,6 +243,19 @@ def test_callback():
     assert cfg.val1 == 'val'
 
 
+def test_callback_params_without_callback():
+    raises(ValueError, "StrOption('val2', '', callback_params={'': ('yes',)})")
+
+
+def test_callback_invalid():
+    raises(ValueError, 'val1 = StrOption("val1", "", callback="string")')
+    raises(ValueError, 'val1 = StrOption("val1", "", callback=return_val, callback_params="string")')
+    val1 = StrOption('val1', "", 'val')
+    raises(ValueError, "StrOption('val2', '', callback=return_value, callback_params={'': 'string'})")
+    raises(ValueError, "StrOption('val4', '', callback=return_value, callback_params={'value': (('string', False),)})")
+    raises(ValueError, "StrOption('val4', '', callback=return_value, callback_params={'value': ((val1, 'string'),)})")
+
+
 def test_callback_value():
     val1 = StrOption('val1', "", 'val')
     val2 = StrOption('val2', "", callback=return_value, callback_params={'': ((val1, False),)})
@@ -421,12 +367,15 @@ def test_callback_multi_value():
     cfg.val1.append('new-val2')
     assert cfg.val1 == ['new-val', 'new-val2']
     assert cfg.val2 == ['new-val', 'new-val2']
-    assert cfg.val4 == ['new-val', 'yes', 'new-val2', 'yes']
+    assert cfg.val4 == ['new-val', 'new-val2', 'yes']
     del(cfg.val1)
     assert cfg.val1 == ['val']
     assert cfg.val2 == ['val']
     assert cfg.val3 == ['yes']
     assert cfg.val4 == ['val', 'yes']
+    cfg.val2.append('new')
+    assert cfg.val1 == ['val']
+    assert cfg.val2 == ['val', 'new']
 
 
 def test_callback_multi_list():
@@ -443,6 +392,14 @@ def test_callback_multi_list():
     assert cfg.val1 == ['val', 'val']
 
 
+def test_callback_multi_list_extend():
+    val1 = StrOption('val1', "", callback=return_list2, callback_params={'': (['1', '2', '3'], ['4', '5'])}, multi=True)
+    maconfig = OptionDescription('rootconfig', '', [val1])
+    cfg = Config(maconfig)
+    cfg.read_write()
+    assert cfg.val1 == ['1', '2', '3', '4', '5']
+
+
 def test_callback_master_and_slaves_master():
     val1 = StrOption('val1', "", multi=True, callback=return_val)
     val2 = StrOption('val2', "", multi=True)
@@ -452,7 +409,7 @@ def test_callback_master_and_slaves_master():
     cfg = Config(maconfig)
     cfg.read_write()
     assert cfg.val1.val1 == ['val']
-    cfg.val1.val1.append(None)
+    cfg.val1.val1.append()
     assert cfg.val1.val1 == ['val', 'val']
     assert cfg.val1.val2 == [None, None]
 
@@ -467,7 +424,7 @@ def test_callback_master_and_slaves_master_list():
     cfg.read_write()
     assert cfg.val1.val1 == ['val', 'val']
     assert cfg.val1.val2 == [None, None]
-    cfg.val1.val1.append(None)
+    cfg.val1.val1.append()
     assert cfg.val1.val1 == ['val', 'val', None]
     assert cfg.val1.val2 == [None, None, None]
     del(cfg.val1.val1)
@@ -512,6 +469,66 @@ def test_callback_master_and_slaves_slave():
     assert cfg.val1.val2 == ['val2', 'val2', 'val']
 
 
+def test_callback_master_and_slaves_slave_cal():
+    val3 = StrOption('val3', "", multi=True)
+    val1 = StrOption('val1', "", multi=True, callback=return_value, callback_params={'': ((val3, False),)})
+    val2 = StrOption('val2', "", multi=True, callback=return_val)
+    interface1 = OptionDescription('val1', '', [val1, val2])
+    interface1.impl_set_group_type(groups.master)
+    maconfig = OptionDescription('rootconfig', '', [interface1, val3])
+    cfg = Config(maconfig)
+    cfg.read_write()
+    assert cfg.val3 == []
+    assert cfg.val1.val1 == []
+    assert cfg.val1.val2 == []
+    cfg.val1.val1 = ['val1']
+    cfg.val3 = ['val1']
+    assert cfg.val1.val1 == ['val1']
+    assert cfg.val1.val2 == ['val']
+    assert cfg.val1.val1 == ['val1']
+    assert cfg.val1.val2 == ['val']
+    del(cfg.val1.val1)
+    cfg.val1.val2 = ['val']
+    cfg.val3 = ['val1', 'val2']
+    assert cfg.val1.val2 == ['val', 'val']
+    assert cfg.val1.val1 == ['val1', 'val2']
+    cfg.val1.val2 = ['val1', 'val2']
+    cfg.val3.pop(1)
+    # cannot remove slave's value because master is calculated
+    # so raise
+    raises(SlaveError, "cfg.val1.val1")
+    raises(SlaveError, "cfg.val1.val2")
+    cfg.val3 = ['val1', 'val2', 'val3']
+    assert cfg.val1.val2 == ['val1', 'val2', 'val']
+
+
+def test_callback_master_and_slaves_slave_cal2():
+    val3 = StrOption('val3', "", ['val', 'val'], multi=True)
+    val1 = StrOption('val1', "", multi=True, callback=return_value, callback_params={'': ((val3, False),)})
+    val2 = StrOption('val2', "", ['val2', 'val2'], multi=True)
+    interface1 = OptionDescription('val1', '', [val1, val2])
+    interface1.impl_set_group_type(groups.master)
+    maconfig = OptionDescription('rootconfig', '', [interface1, val3])
+    cfg = Config(maconfig)
+    cfg.read_write()
+    assert cfg.val3 == ['val', 'val']
+    assert cfg.val1.val1 == ['val', 'val']
+    assert cfg.val1.val2 == ['val2', 'val2']
+    cfg.val3.pop(1)
+#    # cannot remove slave's value because master is calculated
+#    # so raise
+    raises(SlaveError, "cfg.val1.val1")
+    raises(SlaveError, "cfg.val1.val2")
+    cfg.val3 = ['val', 'val']
+    assert cfg.val3 == ['val', 'val']
+    assert cfg.val1.val1 == ['val', 'val']
+    assert cfg.val1.val2 == ['val2', 'val2']
+    raises(SlaveError, "cfg.val1.val1 = ['val']")
+    assert cfg.val3 == ['val', 'val']
+    assert cfg.val1.val1 == ['val', 'val']
+    assert cfg.val1.val2 == ['val2', 'val2']
+
+
 def test_callback_master_and_slaves_slave_list():
     val1 = StrOption('val1', "", multi=True)
     val2 = StrOption('val2', "", multi=True, callback=return_list)
@@ -535,7 +552,8 @@ def test_callback_master_and_slaves_value():
     val3 = StrOption('val3', "", multi=True, callback=return_value, callback_params={'': ('yes',)})
     val4 = StrOption('val4', '', multi=True, default=['val10', 'val11'])
     val5 = StrOption('val5', "", multi=True, callback=return_value, callback_params={'': ((val4, False),)})
-    interface1 = OptionDescription('val1', '', [val1, val2, val3, val5])
+    val6 = StrOption('val6', "", multi=True, callback=return_value, callback_params={'': ((val5, False),)})
+    interface1 = OptionDescription('val1', '', [val1, val2, val3, val5, val6])
     interface1.impl_set_group_type(groups.master)
     maconfig = OptionDescription('rootconfig', '', [interface1, val4])
     cfg = Config(maconfig)
@@ -544,30 +562,35 @@ def test_callback_master_and_slaves_value():
     assert cfg.val1.val2 == []
     assert cfg.val1.val3 == []
     assert cfg.val1.val5 == []
+    assert cfg.val1.val6 == []
     #
     cfg.val1.val1 = ['val1']
     assert cfg.val1.val1 == ['val1']
     assert cfg.val1.val2 == ['val1']
     assert cfg.val1.val3 == ['yes']
     assert cfg.val1.val5 == ['val10']
+    assert cfg.val1.val6 == ['val10']
     #
     cfg.val1.val1.append('val2')
     assert cfg.val1.val1 == ['val1', 'val2']
     assert cfg.val1.val2 == ['val1', 'val2']
     assert cfg.val1.val3 == ['yes', 'yes']
     assert cfg.val1.val5 == ['val10', 'val11']
+    assert cfg.val1.val6 == ['val10', 'val11']
     #
     cfg.val1.val1 = ['val1', 'val2', 'val3']
     assert cfg.val1.val1 == ['val1', 'val2', 'val3']
     assert cfg.val1.val2 == ['val1', 'val2', 'val3']
     assert cfg.val1.val3 == ['yes', 'yes', 'yes']
     assert cfg.val1.val5 == ['val10', 'val11', None]
+    assert cfg.val1.val6 == ['val10', 'val11', None]
     #
     cfg.val1.val1.pop(2)
     assert cfg.val1.val1 == ['val1', 'val2']
     assert cfg.val1.val2 == ['val1', 'val2']
     assert cfg.val1.val3 == ['yes', 'yes']
     assert cfg.val1.val5 == ['val10', 'val11']
+    assert cfg.val1.val6 == ['val10', 'val11']
     #
     cfg.val1.val2 = ['val2', 'val2']
     cfg.val1.val3 = ['val2', 'val2']
@@ -575,11 +598,13 @@ def test_callback_master_and_slaves_value():
     assert cfg.val1.val2 == ['val2', 'val2']
     assert cfg.val1.val3 == ['val2', 'val2']
     assert cfg.val1.val5 == ['val2', 'val2']
+    assert cfg.val1.val6 == ['val2', 'val2']
     #
     cfg.val1.val1.append('val3')
     assert cfg.val1.val2 == ['val2', 'val2', 'val3']
     assert cfg.val1.val3 == ['val2', 'val2', 'yes']
     assert cfg.val1.val5 == ['val2', 'val2', None]
+    assert cfg.val1.val6 == ['val2', 'val2', None]
     cfg.cfgimpl_get_settings().remove('cache')
     cfg.val4 = ['val10', 'val11', 'val12']
     #if value is already set, not updated !
@@ -587,6 +612,69 @@ def test_callback_master_and_slaves_value():
     cfg.val1.val1.append('val3')
     cfg.val1.val1 = ['val1', 'val2', 'val3']
     assert cfg.val1.val5 == ['val2', 'val2', 'val12']
+    assert cfg.val1.val6 == ['val2', 'val2', 'val12']
+
+
+def test_callback_master():
+    val2 = StrOption('val2', "", multi=True, callback=return_value)
+    val1 = StrOption('val1', "", multi=True, callback=return_value, callback_params={'': ((val2, False),)})
+    interface1 = OptionDescription('val1', '', [val1, val2])
+    raises(ValueError, "interface1.impl_set_group_type(groups.master)")
+
+
+def test_callback_master_and_other_master_slave():
+    val1 = StrOption('val1', "", multi=True)
+    val2 = StrOption('val2', "", multi=True)
+    val3 = StrOption('val3', "", multi=True)
+    val4 = StrOption('val4', '', multi=True, default=['val10', 'val11'])
+    val5 = StrOption('val5', "", multi=True, callback=return_value, callback_params={'': ((val1, False),)})
+    val6 = StrOption('val6', "", multi=True, callback=return_value, callback_params={'': ((val2, False),)})
+    interface1 = OptionDescription('val1', '', [val1, val2, val3])
+    interface1.impl_set_group_type(groups.master)
+    interface2 = OptionDescription('val4', '', [val4, val5, val6])
+    interface2.impl_set_group_type(groups.master)
+    maconfig = OptionDescription('rootconfig', '', [interface1, interface2])
+    cfg = Config(maconfig)
+    cfg.read_write()
+    assert cfg.val4.val4 == ['val10', 'val11']
+    assert cfg.val4.val5 == [None, None]
+    assert cfg.val4.val6 == [None, None]
+    cfg.val1.val1 = ['yes']
+    assert cfg.val4.val4 == ['val10', 'val11']
+    assert cfg.val4.val5 == ['yes', None]
+    assert cfg.val4.val6 == [None, None]
+    cfg.val1.val2 = ['no']
+    assert cfg.val4.val4 == ['val10', 'val11']
+    assert cfg.val4.val5 == ['yes', None]
+    assert cfg.val4.val6 == ['no', None]
+    cfg.val1.val1 = ['yes', 'yes', 'yes']
+    cfg.val1.val2 = ['no', 'no', 'no']
+    assert cfg.val4.val4 == ['val10', 'val11']
+    assert cfg.val4.val5 == ['yes', 'yes']
+    assert cfg.val4.val6 == ['no', 'no']
+
+
+def test_callback_different_type():
+    val = IntOption('val', "", default=2)
+    val_ = IntOption('val_', "", default=3)
+    val1 = IntOption('val1', "", multi=True)
+    val2 = IntOption('val2', "", multi=True, callback=return_calc, callback_params={'': ((val, False), (val1, False)), 'k': ((val_, False),)})
+    interface1 = OptionDescription('val1', '', [val1, val2])
+    interface1.impl_set_group_type(groups.master)
+    maconfig = OptionDescription('rootconfig', '', [interface1, val, val_])
+    cfg = Config(maconfig)
+    cfg.read_write()
+    assert cfg.val1.val1 == []
+    assert cfg.val1.val2 == []
+    cfg.val1.val1 = [1]
+    assert cfg.val1.val1 == [1]
+    assert cfg.val1.val2 == [6]
+    cfg.val1.val1 = [1, 3]
+    assert cfg.val1.val1 == [1, 3]
+    assert cfg.val1.val2 == [6, 8]
+    cfg.val1.val1 = [1, 3, 5]
+    assert cfg.val1.val1 == [1, 3, 5]
+    assert cfg.val1.val2 == [6, 8, 10]
 
 
 def test_callback_hidden():
@@ -653,7 +741,7 @@ def test_callback_multi_list_params():
     maconfig = OptionDescription('rootconfig', '', [val1, oval2])
     cfg = Config(maconfig)
     cfg.read_write()
-    assert cfg.val2.val2 == ['val', 'val', 'val', 'val']
+    assert cfg.val2.val2 == ['val', 'val']
 
 
 def test_callback_multi_list_params_key():
@@ -663,31 +751,4 @@ def test_callback_multi_list_params_key():
     maconfig = OptionDescription('rootconfig', '', [val1, oval2])
     cfg = Config(maconfig)
     cfg.read_write()
-    assert cfg.val2.val2 == ['val', 'val', 'val', 'val']
-
-
-def test_callback_multi_multi():
-    val1 = StrOption('val1', "", multi=True, default=['val1', 'val2', 'val3'])
-    val2 = StrOption('val2', "", multi=True, default=['val11', 'val12'])
-    val3 = StrOption('val3', "", default='val4')
-    val4 = StrOption('val4', "", multi=True, callback=return_list2, callback_params={'': ((val1, False), (val2, False))})
-    val5 = StrOption('val5', "", multi=True, callback=return_list2, callback_params={'': ((val1, False), (val3, False))})
-    val6 = StrOption('val6', "", multi=True, default=['val21', 'val22', 'val23'])
-    val7 = StrOption('val7', "", multi=True, callback=return_list2, callback_params={'': ((val1, False), (val6, False))})
-    raises(ValueError, "StrOption('val8', '', multi=True, callback=return_list2, callback_params={'value': ((val1, False), (val6, False))})")
-    maconfig = OptionDescription('rootconfig', '', [val1, val2, val3, val4, val5, val6, val7])
-    cfg = Config(maconfig)
-    cfg.read_write()
-    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")
+    assert cfg.val2.val2 == ['val', 'val']
diff --git a/test/test_option_consistency.py b/test/test_option_consistency.py
index d5226db..edb4f4a 100644
--- a/test/test_option_consistency.py
+++ b/test/test_option_consistency.py
@@ -5,7 +5,32 @@ from tiramisu.setting import owners, groups
 from tiramisu.config import Config
 from tiramisu.option import IPOption, NetworkOption, NetmaskOption, IntOption,\
     BroadcastOption, SymLinkOption, OptionDescription
-from tiramisu.error import ConfigError
+from tiramisu.error import ConfigError, ValueWarning
+import warnings
+
+
+def test_consistency():
+    a = IntOption('a', '')
+    b = IntOption('b', '')
+    od = OptionDescription('od', '', [a, b])
+    a.impl_add_consistency('not_equal', b)
+    #consistency to itself
+    raises(ConfigError, "a.impl_add_consistency('not_equal', a)")
+    #consistency with string
+    raises(ConfigError, "a.impl_add_consistency('not_equal', 'a')")
+
+
+def test_consistency_warnings_only():
+    a = IntOption('a', '')
+    b = IntOption('b', '')
+    od = OptionDescription('od', '', [a, b])
+    a.impl_add_consistency('not_equal', b, warnings_only=True)
+    c = Config(od)
+    c.a = 1
+    warnings.simplefilter("always", ValueWarning)
+    with warnings.catch_warnings(record=True) as w:
+        c.b = 1
+    assert w != []
 
 
 def test_consistency_not_equal():
@@ -158,6 +183,41 @@ def test_consistency_network_netmask():
     raises(ValueError, "c.a = '192.168.1.1'")
 
 
+def test_consistency_ip_in_network():
+    a = NetworkOption('a', '')
+    b = NetmaskOption('b', '')
+    c = IPOption('c', '')
+    od = OptionDescription('od', '', [a, b, c])
+    c.impl_add_consistency('in_network', a, b)
+    cfg = Config(od)
+    cfg.a = '192.168.1.0'
+    cfg.b = '255.255.255.0'
+    cfg.c = '192.168.1.1'
+    raises(ValueError, "cfg.c = '192.168.2.1'")
+
+
+def test_consistency_ip_in_network_len_error():
+    a = NetworkOption('a', '')
+    b = NetmaskOption('b', '')
+    c = IPOption('c', '')
+    od = OptionDescription('od', '', [a, b, c])
+    c.impl_add_consistency('in_network', a)
+    cfg = Config(od)
+    raises(ConfigError, "cfg.a = '192.168.2.0'")
+
+
+def test_consistency_ip_netmask_network_error():
+    a = IPOption('a', '')
+    b = NetworkOption('b', '')
+    c = NetmaskOption('c', '')
+    od = OptionDescription('od', '', [a, b, c])
+    c.impl_add_consistency('ip_netmask', a, b)
+    c = Config(od)
+    c.a = '192.168.1.1'
+    c.b = '192.168.1.0'
+    raises(ConfigError, "c.c = '255.255.255.0'")
+
+
 def test_consistency_ip_netmask_error_multi():
     a = IPOption('a', '', multi=True)
     b = NetmaskOption('b', '')
@@ -206,6 +266,8 @@ def test_consistency_ip_netmask_multi_master():
     c.b = ['255.255.255.255']
     c.b = ['255.255.255.0']
     raises(ValueError, "c.a = ['192.168.1.0']")
+    c.a = ['192.168.1.128']
+    raises(ValueError, "c.b = ['255.255.255.128']")
     c.a = ['192.168.1.2', '192.168.1.3']
 
 
@@ -249,6 +311,20 @@ def test_consistency_broadcast():
     c.c[1] = '192.168.2.255'
 
 
+def test_consistency_broadcast_error():
+    a = NetworkOption('a', '', multi=True)
+    b = NetmaskOption('b', '', multi=True)
+    c = BroadcastOption('c', '', multi=True)
+    od = OptionDescription('a', '', [a, b, c])
+    od.impl_set_group_type(groups.master)
+    b.impl_add_consistency('network_netmask', a)
+    c.impl_add_consistency('broadcast', a)
+    c = Config(od)
+    c.a = ['192.168.1.0']
+    c.b = ['255.255.255.0']
+    raises(ConfigError, "c.c = ['192.168.1.255']")
+
+
 def test_consistency_broadcast_default():
     a = NetworkOption('a', '', '192.168.1.0')
     b = NetmaskOption('b', '', '255.255.255.128')
@@ -272,3 +348,28 @@ def test_consistency_not_all():
     c.a = ['192.168.1.0']
     c.b = ['255.255.255.0']
     c.c = ['192.168.1.255']
+
+
+def test_consistency_permissive():
+    a = IntOption('a', '', 1)
+    b = IntOption('b', '', 2, properties=('hidden',))
+    od = OptionDescription('od', '', [a, b])
+    a.impl_add_consistency('not_equal', b)
+    c = Config(od)
+    c.cfgimpl_get_settings().setpermissive(('hidden',))
+    c.read_write()
+    c.a = 1
+
+
+def return_val(*args, **kwargs):
+    return '192.168.1.1'
+
+
+def test_consistency_with_callback():
+    a = NetworkOption('a', '', default='192.168.1.0')
+    b = NetmaskOption('b', '', default='255.255.255.0')
+    c = IPOption('c', '', callback=return_val, callback_params={'': ((a, False),)})
+    od = OptionDescription('od', '', [a, b, c])
+    c.impl_add_consistency('in_network', a, b)
+    cfg = Config(od)
+    cfg.c
diff --git a/test/test_option_owner.py b/test/test_option_owner.py
index bc96285..d4c3f6b 100644
--- a/test/test_option_owner.py
+++ b/test/test_option_owner.py
@@ -5,7 +5,7 @@ from tiramisu.setting import owners
 from tiramisu.config import Config
 from tiramisu.option import ChoiceOption, BoolOption, IntOption, FloatOption, \
     StrOption, OptionDescription
-from tiramisu.error import ConfigError
+from tiramisu.error import ConfigError, ConstError
 
 
 def make_description():
@@ -36,6 +36,7 @@ def test_default_owner():
     cfg = Config(descr)
     assert cfg.dummy is False
     assert cfg.getowner(gcdummy) == 'default'
+    raises(TypeError, "cfg.getowner('gcdummy')")
     cfg.dummy = True
     assert cfg.getowner(gcdummy) == owners.user
 
@@ -52,6 +53,17 @@ def test_addowner():
     assert cfg.getowner(gcdummy) == owners.gen_config
 
 
+def test_addowner_multiple_time():
+    owners.addowner("testowner")
+    raises(ConstError, 'owners.addowner("testowner")')
+
+
+def test_delete_owner():
+    owners.addowner('deleted')
+    raises(ConstError, 'del(owners.deleted)')
+    raises(ValueError, 'del(owners.deleted2)')
+
+
 def test_owner_is_not_a_string():
     gcdummy = BoolOption('dummy', 'dummy', default=False)
     descr = OptionDescription('tiramisu', '', [gcdummy])
diff --git a/test/test_option_setting.py b/test/test_option_setting.py
index ed5f7d7..28327d5 100644
--- a/test/test_option_setting.py
+++ b/test/test_option_setting.py
@@ -310,6 +310,15 @@ def test_access_by_get_whith_hide():
     raises(AttributeError, "c.find(byname='b1')")
 
 
+def test_extend_config_properties():
+    descr = make_description()
+    cfg = Config(descr)
+    setting = cfg.cfgimpl_get_settings()
+    assert str(setting) == str(['cache', 'expire', 'validator'])
+    setting.extend(['test', 'test2'])
+    assert str(setting) == str(['test', 'cache', 'test2', 'expire', 'validator'])
+
+
 def test_append_properties():
     descr = make_description()
     cfg = Config(descr)
@@ -367,3 +376,14 @@ def test_reset_multiple():
     setting[option].append('test')
     setting.reset(all_properties=True)
     setting.reset(all_properties=True)
+
+
+def test_properties_cached():
+    b1 = BoolOption("b1", "", properties=('test',))
+    descr = OptionDescription("opt", "", [OptionDescription("sub", "", [b1])])
+    c = Config(descr)
+    c.read_write()
+    setting = c.cfgimpl_get_settings()
+    option = c.cfgimpl_get_description().sub.b1
+    c._setattr('sub.b1', True, force_permissive=True)
+    assert str(setting[b1]) == "['test']"
diff --git a/test/test_option_type.py b/test/test_option_type.py
index 6f1970a..3537d6d 100644
--- a/test/test_option_type.py
+++ b/test/test_option_type.py
@@ -75,6 +75,16 @@ def test_group_is_hidden():
         prop = err.proptype
     assert 'hidden' in prop
 
+def test_extend_properties():
+    descr = make_description()
+    config = Config(descr)
+    setting = config.cfgimpl_get_settings()
+    config.read_write()
+    gc = config.unwrap_from_path('gc')
+    config.unwrap_from_path('gc.dummy')
+    setting[gc].extend(['hidden', 'user_defined_property'])
+    assert 'hidden' in setting[gc]
+    assert 'user_defined_property' in setting[gc]
 
 def test_group_is_hidden_multi():
     descr = make_description()
diff --git a/test/test_option_username.py b/test/test_option_username.py
new file mode 100644
index 0000000..472e9cd
--- /dev/null
+++ b/test/test_option_username.py
@@ -0,0 +1,25 @@
+"configuration objects global API"
+import autopath
+from py.test import raises
+
+from tiramisu.config import Config
+from tiramisu.option import UsernameOption
+
+def test_username():
+    UsernameOption('a', '', 'string')
+    UsernameOption('a', '', '_string')
+    UsernameOption('a', '', 's_tring')
+    UsernameOption('a', '', 'string_')
+    UsernameOption('a', '', 'string$')
+    UsernameOption('a', '', '_string$')
+    raises(ValueError, "UsernameOption('a', '', 'strin$g')")
+    UsernameOption('a', '', 's-tring')
+    raises(ValueError, "UsernameOption('a', '', '-string')")
+    UsernameOption('a', '', 's9tring')
+    raises(ValueError, "UsernameOption('a', '', '9string')")
+    raises(ValueError, "UsernameOption('a', '', '')")
+    UsernameOption('a', '', 's')
+    UsernameOption('a', '', 's2345678901234567890123456789012')
+    raises(ValueError, "UsernameOption('a', '', 's23456789012345678901234567890123')")
+    UsernameOption('a', '', 's234567890123456789012345678901$')
+    raises(ValueError, "UsernameOption('a', '', 's2345678901234567890123456789012$')")
diff --git a/test/test_option_validator.py b/test/test_option_validator.py
index 001f9f7..76ebfc8 100644
--- a/test/test_option_validator.py
+++ b/test/test_option_validator.py
@@ -6,6 +6,7 @@ from tiramisu.config import Config
 from tiramisu.option import StrOption, OptionDescription
 from tiramisu.setting import groups
 from tiramisu.error import ValueWarning
+from tiramisu.i18n import _
 
 
 def return_true(value, param=None):
@@ -87,7 +88,7 @@ def test_validator_warning():
         cfg.opt2 = 'val'
     assert len(w) == 1
     assert w[0].message.opt == opt2
-    assert str(w[0].message) == 'invalid value val for option opt2: error'
+    assert str(w[0].message) == _("warning on the value of the option {0}: {1}").format('opt2', 'error')
     #
     with warnings.catch_warnings(record=True) as w:
         cfg.opt3.append('val')
@@ -97,7 +98,7 @@ def test_validator_warning():
         cfg.opt3.append('val1')
     assert len(w) == 1
     assert w[0].message.opt == opt3
-    assert str(w[0].message) == 'invalid value val1 for option opt3: error'
+    assert str(w[0].message) == _("warning on the value of the option {0}: {1}").format('opt3', 'error')
     raises(ValueError, "cfg.opt2 = 1")
     #
     with warnings.catch_warnings(record=True) as w:
@@ -105,9 +106,9 @@ def test_validator_warning():
         cfg.opt3.append('val')
     assert len(w) == 2
     assert w[0].message.opt == opt2
-    assert str(w[0].message) == 'invalid value val for option opt2: error'
+    assert str(w[0].message) == _("warning on the value of the option {0}: {1}").format('opt2', 'error')
     assert w[1].message.opt == opt3
-    assert str(w[1].message) == 'invalid value val1 for option opt3: error'
+    assert str(w[1].message) == _("warning on the value of the option {0}: {1}").format('opt3', 'error')
 
 
 def test_validator_warning_master_slave():
@@ -127,29 +128,29 @@ def test_validator_warning_master_slave():
         cfg.ip_admin_eth0.netmask_admin_eth0 = ['val1']
     assert len(w) == 1
     assert w[0].message.opt == netmask_admin_eth0
-    assert str(w[0].message) == 'invalid value val1 for option netmask_admin_eth0: error'
+    assert str(w[0].message) == _("warning on the value of the option {0}: {1}").format('netmask_admin_eth0', 'error')
     #
     with warnings.catch_warnings(record=True) as w:
         cfg.ip_admin_eth0.ip_admin_eth0 = ['val']
     assert len(w) == 1
     assert w[0].message.opt == ip_admin_eth0
-    assert str(w[0].message) == 'invalid value val for option ip_admin_eth0: error'
+    assert str(w[0].message) == _("warning on the value of the option {0}: {1}").format('ip_admin_eth0', 'error')
     #
     with warnings.catch_warnings(record=True) as w:
         cfg.ip_admin_eth0.ip_admin_eth0 = ['val', 'val1', 'val1']
     assert len(w) == 1
     assert w[0].message.opt == ip_admin_eth0
-    assert str(w[0].message) == 'invalid value val for option ip_admin_eth0: error'
+    assert str(w[0].message) == _("warning on the value of the option {0}: {1}").format('ip_admin_eth0', 'error')
     #
     with warnings.catch_warnings(record=True) as w:
         cfg.ip_admin_eth0.ip_admin_eth0 = ['val1', 'val', 'val1']
     assert len(w) == 1
     assert w[0].message.opt == ip_admin_eth0
-    assert str(w[0].message) == 'invalid value val for option ip_admin_eth0: error'
+    assert str(w[0].message) == _("warning on the value of the option {0}: {1}").format('ip_admin_eth0', 'error')
     #
     warnings.resetwarnings()
     with warnings.catch_warnings(record=True) as w:
         cfg.ip_admin_eth0.ip_admin_eth0 = ['val1', 'val1', 'val']
     assert len(w) == 1
     assert w[0].message.opt == ip_admin_eth0
-    assert str(w[0].message) == 'invalid value val for option ip_admin_eth0: error'
+    assert str(w[0].message) == _("warning on the value of the option {0}: {1}").format('ip_admin_eth0', 'error')
diff --git a/test/test_parsing_group.py b/test/test_parsing_group.py
index 7ecd860..c3b6ffc 100644
--- a/test/test_parsing_group.py
+++ b/test/test_parsing_group.py
@@ -94,6 +94,19 @@ def test_iter_on_groups():
     result = list(config.creole.iter_groups(group_type=groups.family))
     group_names = [res[0] for res in result]
     assert group_names == ['general', 'interface1']
+    for i in config.creole.iter_groups(group_type=groups.family):
+        #test StopIteration
+        break
+
+
+def test_iter_on_groups_props():
+    descr = make_description()
+    config = Config(descr)
+    config.read_write()
+    config.cfgimpl_get_settings()[descr.creole.interface1].append('disabled')
+    result = list(config.creole.iter_groups(group_type=groups.family))
+    group_names = [res[0] for res in result]
+    assert group_names == ['general']
 
 
 def test_iter_on_empty_group():
diff --git a/test/test_permissive.py b/test/test_permissive.py
index 38a8bcf..615fef7 100644
--- a/test/test_permissive.py
+++ b/test/test_permissive.py
@@ -9,7 +9,8 @@ from tiramisu.error import PropertiesOptionError
 
 def make_description():
     u1 = IntOption('u1', '', properties=('frozen', 'mandatory', 'disabled', ))
-    return OptionDescription('od1', '', [u1])
+    u2 = IntOption('u2', '', properties=('frozen', 'mandatory', 'disabled', ))
+    return OptionDescription('od1', '', [u1, u2])
 
 
 def test_permissive():
@@ -91,3 +92,108 @@ def test_invalid_permissive():
     setting = config.cfgimpl_get_settings()
     config.read_write()
     raises(TypeError, "setting.setpermissive(['frozen', 'disabled',])")
+
+
+def test_permissive_option():
+    descr = make_description()
+    u1 = descr.u1
+    config = Config(descr)
+    setting = config.cfgimpl_get_settings()
+    config.read_write()
+
+    props = []
+    try:
+        config.u1
+    except PropertiesOptionError as err:
+        props = err.proptype
+    assert props == ['disabled']
+    props = []
+    try:
+        config.u2
+    except PropertiesOptionError as err:
+        props = err.proptype
+    assert props == ['disabled']
+
+    setting.setpermissive(('disabled',), u1)
+    props = []
+    try:
+        config.u1
+    except PropertiesOptionError as err:
+        props = err.proptype
+    assert props == []
+    props = []
+    try:
+        config.u2
+    except PropertiesOptionError as err:
+        props = err.proptype
+    assert props == ['disabled']
+
+    setting.append('permissive')
+    config.u1
+    props = []
+    try:
+        config.u2
+    except PropertiesOptionError as err:
+        props = err.proptype
+    assert props == ['disabled']
+
+    setting.remove('permissive')
+    props = []
+    try:
+        config.u1
+    except PropertiesOptionError as err:
+        props = err.proptype
+    assert props == []
+    props = []
+    try:
+        config.u2
+    except PropertiesOptionError as err:
+        props = err.proptype
+    assert props == ['disabled']
+
+
+def test_permissive_option_mandatory():
+    descr = make_description()
+    u1 = descr.u1
+    config = Config(descr)
+    setting = config.cfgimpl_get_settings()
+    config.read_only()
+    props = []
+    try:
+        config.u1
+    except PropertiesOptionError as err:
+        props = err.proptype
+    assert set(props) == set(['disabled', 'mandatory'])
+    setting.setpermissive(('mandatory', 'disabled',), u1)
+    setting.append('permissive')
+    config.u1
+    setting.remove('permissive')
+    try:
+        config.u1
+    except PropertiesOptionError as err:
+        props = err.proptype
+    assert set(props) == set(['disabled', 'mandatory'])
+
+
+def test_permissive_option_frozen():
+    descr = make_description()
+    config = Config(descr)
+    u1 = descr.u1
+    setting = config.cfgimpl_get_settings()
+    config.read_write()
+    setting.setpermissive(('frozen', 'disabled'), u1)
+    config.u1 = 1
+    assert config.u1 == 1
+    setting.append('permissive')
+    assert config.u1 == 1
+    setting.remove('permissive')
+    assert config.u1 == 1
+
+
+def test_invalid_option_permissive():
+    descr = make_description()
+    u1 = descr.u1
+    config = Config(descr)
+    setting = config.cfgimpl_get_settings()
+    config.read_write()
+    raises(TypeError, "setting.setpermissive(['frozen', 'disabled',], u1)")
diff --git a/test/test_requires.py b/test/test_requires.py
index ba6cf3f..ff9c2a6 100644
--- a/test/test_requires.py
+++ b/test/test_requires.py
@@ -24,6 +24,42 @@ def test_requires():
     except PropertiesOptionError as err:
         props = err.proptype
     assert props == ['disabled']
+    c.activate_service = True
+    c.ip_address_service
+
+
+def test_requires_with_requires():
+    a = BoolOption('activate_service', '', True)
+    b = IPOption('ip_address_service', '',
+                 requires=[{'option': a, 'expected': False, 'action': 'disabled'}])
+    od = OptionDescription('service', '', [a, b])
+    c = Config(od)
+    c.read_write()
+    c.cfgimpl_get_settings()[b].append('test')
+    c.ip_address_service
+    c.activate_service = False
+    props = []
+    try:
+        c.ip_address_service
+    except PropertiesOptionError as err:
+        props = err.proptype
+    assert props == ['disabled']
+    c.activate_service = True
+    c.ip_address_service
+
+
+def test_requires_invalid():
+    a = BoolOption('activate_service', '', True)
+    raises(ValueError, "IPOption('ip_address_service', '', requires='string')")
+    raises(ValueError, "IPOption('ip_address_service', '', requires=[{'option': a, 'expected': False, 'action': 'disabled', 'unknown': True}])")
+    raises(ValueError, "IPOption('ip_address_service', '', requires=[{'option': a, 'expected': False}])")
+    raises(ValueError, "IPOption('ip_address_service', '', requires=[{'option': a, 'action': 'disabled'}])")
+    raises(ValueError, "IPOption('ip_address_service', '', requires=[{'expected': False, 'action': 'disabled'}])")
+    raises(ValueError, "IPOption('ip_address_service', '', requires=[{'option': a, 'expected': False, 'action': 'disabled', 'inverse': 'string'}])")
+    raises(ValueError, "IPOption('ip_address_service', '', requires=[{'option': a, 'expected': False, 'action': 'disabled', 'transitive': 'string'}])")
+    raises(ValueError, "IPOption('ip_address_service', '', requires=[{'option': a, 'expected': False, 'action': 'disabled', 'same_action': 'string'}])")
+    raises(ValueError, "IPOption('ip_address_service', '', requires=[{'option': 'string', 'expected': False, 'action': 'disabled'}])")
+    raises(ValueError, "IPOption('ip_address_service', '', requires=[{'option': a, 'expected': 'string', 'action': 'disabled'}])")
 
 
 def test_requires_same_action():
@@ -504,6 +540,11 @@ def test_requires_requirement_append():
     c.cfgimpl_get_settings()[b].append("test")
 
 
+def test_requires_different_inverse():
+    a = BoolOption('activate_service', '', True)
+    raises(ValueError, "IPOption('ip_address_service', '', requires=[{'option': a, 'expected': True, 'action': 'disabled', 'inverse': True}, {'option': a, 'expected': True, 'action': 'disabled', 'inverse': False}])")
+
+
 def test_requires_recursive_path():
     a = BoolOption('activate_service', '', True)
     b = IPOption('ip_address_service', '',
diff --git a/test/test_slots.py b/test/test_slots.py
index 1f2aee6..2031cf8 100644
--- a/test/test_slots.py
+++ b/test/test_slots.py
@@ -3,9 +3,10 @@ import autopath
 from py.test import raises
 
 from tiramisu.config import Config, SubConfig
-from tiramisu.option import ChoiceOption, BoolOption, IntOption, FloatOption, \
+from tiramisu.option import ChoiceOption, BoolOption, IntOption, FloatOption,\
     StrOption, SymLinkOption, UnicodeOption, IPOption, OptionDescription, \
-    PortOption, NetworkOption, NetmaskOption, DomainnameOption
+    PortOption, NetworkOption, NetmaskOption, DomainnameOption, EmailOption, \
+    URLOption, FilenameOption
 
 
 def test_slots_option():
@@ -35,6 +36,12 @@ def test_slots_option():
     raises(AttributeError, "c.x = 1")
     c = DomainnameOption('a', '')
     raises(AttributeError, "c.x = 1")
+    c = EmailOption('a', '')
+    raises(AttributeError, "c.x = 1")
+    c = URLOption('a', '')
+    raises(AttributeError, "c.x = 1")
+    c = FilenameOption('a', '')
+    raises(AttributeError, "c.x = 1")
 
 
 def test_slots_option_readonly():
@@ -49,7 +56,10 @@ def test_slots_option_readonly():
     j = NetworkOption('j', '')
     k = NetmaskOption('k', '')
     l = DomainnameOption('l', '')
-    m = OptionDescription('m', '', [a, b, c, d, e, g, h, i, j, k, l])
+    o = EmailOption('o', '')
+    p = URLOption('p', '')
+    q = FilenameOption('q', '')
+    m = OptionDescription('m', '', [a, b, c, d, e, g, h, i, j, k, l, o, p, q])
     a._requires = 'a'
     b._requires = 'b'
     c._requires = 'c'
@@ -62,6 +72,9 @@ def test_slots_option_readonly():
     k._requires = 'k'
     l._requires = 'l'
     m._requires = 'm'
+    o._requires = 'o'
+    p._requires = 'p'
+    q._requires = 'q'
     Config(m)
     raises(AttributeError, "a._requires = 'a'")
     raises(AttributeError, "b._requires = 'b'")
@@ -75,6 +88,9 @@ def test_slots_option_readonly():
     raises(AttributeError, "k._requires = 'k'")
     raises(AttributeError, "l._requires = 'l'")
     raises(AttributeError, "m._requires = 'm'")
+    raises(AttributeError, "o._requires = 'o'")
+    raises(AttributeError, "p._requires = 'p'")
+    raises(AttributeError, "q._requires = 'q'")
 
 
 def test_slots_option_readonly_name():
@@ -90,7 +106,10 @@ def test_slots_option_readonly_name():
     j = NetworkOption('j', '')
     k = NetmaskOption('k', '')
     l = DomainnameOption('l', '')
-    m = OptionDescription('m', '', [a, b, c, d, e, f, g, h, i, j, k, l])
+    o = DomainnameOption('o', '')
+    p = DomainnameOption('p', '')
+    q = DomainnameOption('q', '')
+    m = OptionDescription('m', '', [a, b, c, d, e, f, g, h, i, j, k, l, o, p, q])
     raises(AttributeError, "a._name = 'a'")
     raises(AttributeError, "b._name = 'b'")
     raises(AttributeError, "c._name = 'c'")
@@ -104,6 +123,9 @@ def test_slots_option_readonly_name():
     raises(AttributeError, "k._name = 'k'")
     raises(AttributeError, "l._name = 'l'")
     raises(AttributeError, "m._name = 'm'")
+    raises(AttributeError, "o._name = 'o'")
+    raises(AttributeError, "p._name = 'p'")
+    raises(AttributeError, "q._name = 'q'")
 
 
 def test_slots_description():
diff --git a/test/test_state.py b/test/test_state.py
index ef46ce2..03be06e 100644
--- a/test/test_state.py
+++ b/test/test_state.py
@@ -1,10 +1,13 @@
+import autopath
+
 from tiramisu.option import BoolOption, UnicodeOption, SymLinkOption, \
-    OptionDescription
-from tiramisu.config import Config
+    IntOption, OptionDescription
+from tiramisu.config import Config, GroupConfig, MetaConfig
 from tiramisu.setting import owners
 from tiramisu.storage import delete_session
 from tiramisu.error import ConfigError
 from pickle import dumps, loads
+from py.test import raises
 
 
 def return_value(value=None):
@@ -90,10 +93,48 @@ def _diff_opt(opt1, opt2):
             assert val1 == val2
 
 
+def _diff_conf(cfg1, cfg2):
+    attr1 = set(_get_slots(cfg1))
+    attr2 = set(_get_slots(cfg2))
+    diff1 = attr1 - attr2
+    diff2 = attr2 - attr1
+    if diff1 != set():
+        raise Exception('more attribute in cfg1 {0}'.format(list(diff1)))
+    if diff2 != set():
+        raise Exception('more attribute in cfg2 {0}'.format(list(diff2)))
+    for attr in attr1:
+        if attr in ('_impl_context', '__weakref__'):
+            continue
+        err1 = False
+        err2 = False
+        val1 = None
+        val2 = None
+        try:
+            val1 = getattr(cfg1, attr)
+        except:
+            err1 = True
+
+        try:
+            val2 = getattr(cfg2, attr)
+        except:
+            err2 = True
+        assert err1 == err2
+        if val1 is None:
+            assert val1 == val2
+        elif attr == '_impl_values':
+            assert cfg1.cfgimpl_get_values().get_modified_values() == cfg2.cfgimpl_get_values().get_modified_values()
+        elif attr == '_impl_settings':
+            assert cfg1.cfgimpl_get_settings().get_modified_properties() == cfg2.cfgimpl_get_settings().get_modified_properties()
+            assert cfg1.cfgimpl_get_settings().get_modified_permissives() == cfg2.cfgimpl_get_settings().get_modified_permissives()
+        elif attr == '_impl_descr':
+            _diff_opt(cfg1.cfgimpl_get_description(), cfg2.cfgimpl_get_description())
+        else:
+            assert val1 == val2
+
+
 def test_diff_opt():
     b = BoolOption('b', '')
     u = UnicodeOption('u', '', requires=[{'option': b, 'expected': True, 'action': 'disabled', 'inverse': True}])
-    #u.impl_add_consistency('not_equal', b)
     s = SymLinkOption('s', u)
     o = OptionDescription('o', '', [b, u, s])
     o1 = OptionDescription('o1', '', [o])
@@ -107,6 +148,11 @@ def test_diff_opt():
     _diff_opt(o1.o.s, q.o.s)
 
 
+def test_only_optiondescription():
+    b = BoolOption('b', '')
+    raises(SystemError, "a = dumps(b)")
+
+
 def test_diff_opt_cache():
     b = BoolOption('b', '')
     u = UnicodeOption('u', '', requires=[{'option': b, 'expected': True, 'action': 'disabled', 'inverse': True}])
@@ -169,10 +215,7 @@ def test_state_config():
         cfg._impl_test = True
     a = dumps(cfg)
     q = loads(a)
-    _diff_opt(maconfig, q.cfgimpl_get_description())
-    assert cfg.cfgimpl_get_values().get_modified_values() == q.cfgimpl_get_values().get_modified_values()
-    assert cfg.cfgimpl_get_settings().get_modified_properties() == q.cfgimpl_get_settings().get_modified_properties()
-    assert cfg.cfgimpl_get_settings().get_modified_permissives() == q.cfgimpl_get_settings().get_modified_permissives()
+    _diff_conf(cfg, q)
     try:
         delete_session('29090931')
     except ConfigError:
@@ -191,12 +234,9 @@ def test_state_properties():
     cfg.cfgimpl_get_settings()[val1].append('test')
     a = dumps(cfg)
     q = loads(a)
-    _diff_opt(maconfig, q.cfgimpl_get_description())
-    assert cfg.cfgimpl_get_values().get_modified_values() == q.cfgimpl_get_values().get_modified_values()
-    assert cfg.cfgimpl_get_settings().get_modified_properties() == q.cfgimpl_get_settings().get_modified_properties()
-    assert cfg.cfgimpl_get_settings().get_modified_permissives() == q.cfgimpl_get_settings().get_modified_permissives()
+    _diff_conf(cfg, q)
     try:
-        delete_session('29090931')
+        delete_session('29090932')
     except ConfigError:
         pass
 
@@ -212,15 +252,12 @@ def test_state_values():
     cfg.val1 = True
     a = dumps(cfg)
     q = loads(a)
-    _diff_opt(maconfig, q.cfgimpl_get_description())
-    assert cfg.cfgimpl_get_values().get_modified_values() == q.cfgimpl_get_values().get_modified_values()
-    assert cfg.cfgimpl_get_settings().get_modified_properties() == q.cfgimpl_get_settings().get_modified_properties()
-    assert cfg.cfgimpl_get_settings().get_modified_permissives() == q.cfgimpl_get_settings().get_modified_permissives()
+    _diff_conf(cfg, q)
     q.val1 = False
     #assert cfg.val1 is True
     assert q.val1 is False
     try:
-        delete_session('29090931')
+        delete_session('29090933')
     except ConfigError:
         pass
 
@@ -238,14 +275,94 @@ def test_state_values_owner():
     cfg.val1 = True
     a = dumps(cfg)
     q = loads(a)
-    _diff_opt(maconfig, q.cfgimpl_get_description())
-    assert cfg.cfgimpl_get_values().get_modified_values() == q.cfgimpl_get_values().get_modified_values()
-    assert cfg.cfgimpl_get_settings().get_modified_properties() == q.cfgimpl_get_settings().get_modified_properties()
-    assert cfg.cfgimpl_get_settings().get_modified_permissives() == q.cfgimpl_get_settings().get_modified_permissives()
+    _diff_conf(cfg, q)
     q.val1 = False
     nval1 = q.cfgimpl_get_description().val1
     assert q.getowner(nval1) == owners.newowner
     try:
-        delete_session('29090931')
+        delete_session('29090934')
     except ConfigError:
         pass
+
+
+def test_state_metaconfig():
+    i1 = IntOption('i1', '')
+    od1 = OptionDescription('od1', '', [i1])
+    od2 = OptionDescription('od2', '', [od1])
+    conf1 = Config(od2, session_id='29090935')
+    conf1._impl_test = True
+    conf2 = Config(od2, session_id='29090936')
+    conf2._impl_test = True
+    meta = MetaConfig([conf1, conf2], session_id='29090937')
+    meta._impl_test = True
+    raises(ConfigError, "dumps(meta)")
+    try:
+        delete_session('29090935')
+        delete_session('29090936')
+        delete_session('29090937')
+    except ConfigError:
+        pass
+
+
+def test_state_groupconfig():
+    i1 = IntOption('i1', '')
+    od1 = OptionDescription('od1', '', [i1])
+    od2 = OptionDescription('od2', '', [od1])
+    conf1 = Config(od2, session_id='29090935')
+    conf1._impl_test = True
+    conf2 = Config(od2, session_id='29090936')
+    conf2._impl_test = True
+    meta = GroupConfig([conf1, conf2], session_id='29090937')
+    meta._impl_test = True
+    a = dumps(meta)
+    q = loads(a)
+    _diff_conf(meta, q)
+    try:
+        delete_session('29090935')
+        delete_session('29090936')
+        delete_session('29090937')
+    except ConfigError:
+        pass
+
+
+def test_state_unkown_setting_owner():
+    """load an unknow _owner, should create it"""
+    assert not 'supernewuser' in owners.__dict__
+    loads("""ccopy_reg
+_reconstructor
+p0
+(ctiramisu.setting
+Settings
+p1
+c__builtin__
+object
+p2
+Ntp3
+Rp4
+(dp5
+S'_owner'
+p6
+S'supernewuser'
+p7
+sS'_p_'
+p8
+g0
+(ctiramisu.storage.dictionary.setting
+Settings
+p9
+g2
+Ntp10
+Rp11
+(dp12
+S'_cache'
+p13
+(dp14
+sS'_permissives'
+p15
+(dp16
+sS'_properties'
+p17
+(dp18
+sbsb.
+.""")
+    assert 'supernewuser' in owners.__dict__
diff --git a/tiramisu/autolib.py b/tiramisu/autolib.py
index eb5c6ef..0b97644 100644
--- a/tiramisu/autolib.py
+++ b/tiramisu/autolib.py
@@ -19,15 +19,16 @@
 # ____________________________________________________________
 "enables us to carry out a calculation and return an option's value"
 from tiramisu.error import PropertiesOptionError, ConfigError
+from tiramisu.setting import multitypes
 from tiramisu.i18n import _
 # ____________________________________________________________
 
 
-def carry_out_calculation(name, config, callback, callback_params,
+def carry_out_calculation(option, config, callback, callback_params,
                           index=None, max_len=None):
     """a function that carries out a calculation for an option's value
 
-    :param name: the option name (`opt._name`)
+    :param name: the option
     :param config: the context config in order to have
                    the whole options available
     :param callback: the name of the callback function
@@ -48,13 +49,13 @@ def carry_out_calculation(name, config, callback, callback_params,
     Values could have multiple values only when key is ''.
 
     * if no callback_params:
-      => calculate()
+      => calculate(<function func at 0x2092320>, [], {})
 
     * if callback_params={'': ('yes',)}
-      => calculate('yes')
+      => calculate(<function func at 0x2092320>, ['yes'], {})
 
     * if callback_params={'value': ('yes',)}
-      => calculate(value='yes')
+      => calculate(<function func at 0x165b320>, [], {'value': 'yes'})
 
     * if callback_params={'': ('yes', 'no')}
       => calculate('yes', 'no')
@@ -62,58 +63,71 @@ def carry_out_calculation(name, config, callback, callback_params,
     * if callback_params={'value': ('yes', 'no')}
       => ValueError()
 
+    * if callback_params={'': (['yes', 'no'],)}
+      => calculate(<function func at 0x176b320>, ['yes', 'no'], {})
+
+    * if callback_params={'value': ('yes', 'no')}
+      => raises ValueError()
+
     * if callback_params={'': ((opt1, False),)}
 
        - a simple option:
          opt1 == 11
-         => calculate(11)
+         => calculate(<function func at 0x1cea320>, [11], {})
 
-       - a multi option:
+       - a multi option and not master/slave:
          opt1 == [1, 2, 3]
-         => calculate(1)
-         => calculate(2)
-         => calculate(3)
+         => calculate(<function func at 0x223c320>, [[1, 2, 3]], {})
+
+       - option is master or slave of opt1:
+         opt1 == [1, 2, 3]
+         => calculate(<function func at 0x223c320>, [1], {})
+         => calculate(<function func at 0x223c320>, [2], {})
+         => calculate(<function func at 0x223c320>, [3], {})
+
+      - opt is a master or slave but not related to option:
+        opt1 == [1, 2, 3]
+        => calculate(<function func at 0x11b0320>, [[1, 2, 3]], {})
 
     * if callback_params={'value': ((opt1, False),)}
 
        - a simple option:
          opt1 == 11
-         => calculate(value=11)
+         => calculate(<function func at 0x17ff320>, [], {'value': 11})
 
        - a multi option:
          opt1 == [1, 2, 3]
-         => calculate(value=1)
-         => calculate(value=2)
-         => calculate(value=3)
+         => calculate(<function func at 0x1262320>, [], {'value': [1, 2, 3]})
 
     * if callback_params={'': ((opt1, False), (opt2, False))}
 
+      - two single options
+          opt1 = 11
+          opt2 = 12
+          => calculate(<function func at 0x217a320>, [11, 12], {})
+
       - a multi option with a simple option
           opt1 == [1, 2, 3]
-          opt2 == 11
-          => calculate(1, 11)
-          => calculate(2, 11)
-          => calculate(3, 11)
+          opt2 == 12
+          => calculate(<function func at 0x2153320>, [[1, 2, 3], 12], {})
 
       - a multi option with an other multi option but with same length
           opt1 == [1, 2, 3]
           opt2 == [11, 12, 13]
-          => calculate(1, 11)
-          => calculate(2, 12)
-          => calculate(3, 13)
+          => calculate(<function func at 0x1981320>, [[1, 2, 3], [11, 12, 13]], {})
 
       - a multi option with an other multi option but with different length
           opt1 == [1, 2, 3]
           opt2 == [11, 12]
-          => ConfigError()
+          => calculate(<function func at 0x2384320>, [[1, 2, 3], [11, 12]], {})
 
       - a multi option without value with a simple option
           opt1 == []
           opt2 == 11
-          => []
+          => calculate(<function func at 0xb65320>, [[], 12], {})
 
     * if callback_params={'value': ((opt1, False), (opt2, False))}
-      => ConfigError()
+      => raises ValueError()
 
     If index is not None, return a value, otherwise return:
 
@@ -132,29 +146,36 @@ def carry_out_calculation(name, config, callback, callback_params,
         for callbk in callbacks:
             if isinstance(callbk, tuple):
                 # callbk is something link (opt, True|False)
-                option, force_permissive = callbk
+                opt, force_permissive = callbk
                 path = config.cfgimpl_get_description().impl_get_path_by_opt(
-                    option)
+                    opt)
                 # get value
                 try:
-                    value = config._getattr(path, force_permissive=True)
+                    value = config._getattr(path, force_permissive=True, validate=False)
+                    # convert to list, not modifie this multi
+                    if value.__class__.__name__ == 'Multi':
+                        value = list(value)
                 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,
+                                        '{2}').format(opt._name,
                                                       err.proptype,
-                                                      name))
-                is_multi = option.impl_is_multi()
+                                                      option._name))
+
+                is_multi = False
+                if opt.impl_is_multi():
+                    #opt is master, search if option is a slave
+                    if opt.impl_get_multitype() == multitypes.master:
+                        if option in opt.impl_get_master_slaves():
+                            is_multi = True
+                    #opt is slave, search if option is an other slaves
+                    elif opt.impl_get_multitype() == multitypes.slave:
+                        if option in opt.impl_get_master_slaves().impl_get_master_slaves():
+                            is_multi = True
                 if is_multi:
-                    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
+                    len_multi = len(value)
                     one_is_multi = True
                 tcparams.setdefault(key, []).append((value, is_multi))
             else:
@@ -167,16 +188,9 @@ def carry_out_calculation(name, config, callback, callback_params,
     if one_is_multi:
         ret = []
         if index:
-            if index < len_multi:
-                range_ = [index]
-            else:
-                range_ = []
-                ret = None
+            range_ = [index]
         else:
-            if max_len and max_len < len_multi:
-                range_ = range(max_len)
-            else:
-                range_ = range(len_multi)
+            range_ = range(len_multi)
         for incr in range_:
             args = []
             kwargs = {}
@@ -195,10 +209,7 @@ def carry_out_calculation(name, config, callback, callback_params,
             if index:
                 ret = calc
             else:
-                if isinstance(calc, list):
-                    ret.extend(calc)
-                else:
-                    ret.append(calc)
+                ret.append(calc)
         return ret
     else:
         # no value is multi
@@ -212,7 +223,18 @@ def carry_out_calculation(name, config, callback, callback_params,
                     args.append(couple[0])
                 else:
                     kwargs[key] = couple[0]
-        return calculate(callback, args, kwargs)
+        ret = calculate(callback, args, kwargs)
+        if callback_params != {}:
+            if isinstance(ret, list) and max_len:
+                ret = ret[:max_len]
+                if len(ret) < max_len:
+                    ret = ret + [None] * (max_len - len(ret))
+            if isinstance(ret, list) and index:
+                if len(ret) < index + 1:
+                    ret = None
+                else:
+                    ret = ret[index]
+        return ret
 
 
 def calculate(callback, args, kwargs):
diff --git a/tiramisu/config.py b/tiramisu/config.py
index 1c05e22..2a882a1 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -47,7 +47,7 @@ class SubConfig(object):
         :type subpath: `str` with the path name
         """
         # main option description
-        if not isinstance(descr, OptionDescription):
+        if descr is not None and not isinstance(descr, OptionDescription):
             raise TypeError(_('descr must be an optiondescription, not {0}'
                               ).format(type(descr)))
         self._impl_descr = descr
@@ -148,19 +148,25 @@ class SubConfig(object):
             except UnicodeEncodeError:
                 lines.append("{0} = {1}".format(name,
                                                 value.encode(default_encoding)))
-            except PropertiesOptionError:
-                pass
         return '\n'.join(lines)
 
     __repr__ = __str__
 
     def _cfgimpl_get_context(self):
-        return self._impl_context()
+        """context could be None, we need to test it
+        context is None only if all reference to `Config` object is deleted
+        (for example we delete a `Config` and we manipulate a reference to
+        old `SubConfig`, `Values`, `Multi` or `Settings`)
+        """
+        context = self._impl_context()
+        if context is None:
+            raise ConfigError(_('the context does not exist anymore'))
+        return context
 
     def cfgimpl_get_description(self):
         if self._impl_descr is None:
             raise ConfigError(_('no option description found for this config'
-                                ' (may be metaconfig without meta)'))
+                                ' (may be GroupConfig)'))
         else:
             return self._impl_descr
 
@@ -249,7 +255,8 @@ class SubConfig(object):
                 force_properties=force_properties,
                 force_permissive=force_permissive)
 
-    def find(self, bytype=None, byname=None, byvalue=None, type_='option'):
+    def find(self, bytype=None, byname=None, byvalue=None, type_='option',
+             check_properties=True):
         """
             finds a list of options recursively in the config
 
@@ -261,11 +268,11 @@ class SubConfig(object):
         return self._cfgimpl_get_context()._find(bytype, byname, byvalue,
                                                  first=False,
                                                  type_=type_,
-                                                 _subpath=self.cfgimpl_get_path()
-                                                 )
+                                                 _subpath=self.cfgimpl_get_path(),
+                                                 check_properties=check_properties)
 
     def find_first(self, bytype=None, byname=None, byvalue=None,
-                   type_='option', display_error=True):
+                   type_='option', display_error=True, check_properties=True):
         """
             finds an option recursively in the config
 
@@ -276,7 +283,8 @@ class SubConfig(object):
         """
         return self._cfgimpl_get_context()._find(
             bytype, byname, byvalue, first=True, type_=type_,
-            _subpath=self.cfgimpl_get_path(), display_error=display_error)
+            _subpath=self.cfgimpl_get_path(), display_error=display_error,
+            check_properties=check_properties)
 
     def _find(self, bytype, byname, byvalue, first, type_='option',
               _subpath=None, check_properties=True, display_error=True):
@@ -287,12 +295,9 @@ class SubConfig(object):
         :return: find list or an exception if nothing has been found
         """
         def _filter_by_name():
-            try:
-                if byname is None or path == byname or \
-                        path.endswith('.' + byname):
-                    return True
-            except IndexError:
-                pass
+            if byname is None or path == byname or \
+                    path.endswith('.' + byname):
+                return True
             return False
 
         def _filter_by_value():
@@ -442,23 +447,20 @@ class SubConfig(object):
         return pathsvalues
 
     def _make_sub_dict(self, opt, path, pathsvalues, _currpath, flatten):
-        if isinstance(opt, OptionDescription):
-            try:
+        try:
+            if isinstance(opt, OptionDescription):
                 pathsvalues += getattr(self, path).make_dict(flatten,
                                                              _currpath +
                                                              path.split('.'))
-            except PropertiesOptionError:
-                pass  # this just a hidden or disabled option
-        else:
-            try:
+            else:
                 value = self._getattr(opt._name)
                 if flatten:
                     name = opt._name
                 else:
                     name = '.'.join(_currpath + [opt._name])
                 pathsvalues.append((name, value))
-            except PropertiesOptionError:
-                pass  # this just a hidden or disabled option
+        except PropertiesOptionError:
+            pass
 
     def cfgimpl_get_path(self):
         descr = self.cfgimpl_get_description()
@@ -466,9 +468,9 @@ class SubConfig(object):
         return context_descr.impl_get_path_by_opt(descr)
 
 
-class CommonConfig(SubConfig):
-    "abstract base class for the Config and the MetaConfig"
-    __slots__ = ('_impl_values', '_impl_settings', '_impl_meta')
+class _CommonConfig(SubConfig):
+    "abstract base class for the Config, GroupConfig and the MetaConfig"
+    __slots__ = ('_impl_values', '_impl_settings', '_impl_meta', '_impl_test')
 
     def _impl_build_all_paths(self):
         self.cfgimpl_get_description().impl_build_cache()
@@ -507,7 +509,8 @@ class CommonConfig(SubConfig):
         return None
 
     def cfgimpl_get_meta(self):
-        return self._impl_meta
+        if self._impl_meta is not None:
+            return self._impl_meta()
 
     # information
     def impl_set_information(self, key, value):
@@ -525,11 +528,48 @@ class CommonConfig(SubConfig):
         """
         return self._impl_values.get_information(key, default)
 
+    # ----- state
+    def __getstate__(self):
+        if self._impl_meta is not None:
+            raise ConfigError(_('cannot serialize Config with MetaConfig'))
+        slots = set()
+        for subclass in self.__class__.__mro__:
+            if subclass is not object:
+                slots.update(subclass.__slots__)
+        slots -= frozenset(['_impl_context', '_impl_meta', '__weakref__'])
+        state = {}
+        for slot in slots:
+            try:
+                state[slot] = getattr(self, slot)
+            except AttributeError:
+                pass
+        storage = self._impl_values._p_._storage
+        if not storage.serializable:
+            raise ConfigError(_('this storage is not serialisable, could be a '
+                              'none persistent storage'))
+        state['_storage'] = {'session_id': storage.session_id,
+                             'persistent': storage.persistent}
+        state['_impl_setting'] = _impl_getstate_setting()
+        return state
+
+    def __setstate__(self, state):
+        for key, value in state.items():
+            if key not in ['_storage', '_impl_setting']:
+                setattr(self, key, value)
+        set_storage(**state['_impl_setting'])
+        self._impl_context = weakref.ref(self)
+        self._impl_settings.context = weakref.ref(self)
+        self._impl_values.context = weakref.ref(self)
+        storage = get_storage(test=self._impl_test, **state['_storage'])
+        self._impl_values._impl_setstate(storage)
+        self._impl_settings._impl_setstate(storage)
+        self._impl_meta = None
+
 
 # ____________________________________________________________
-class Config(CommonConfig):
+class Config(_CommonConfig):
     "main configuration management entry"
-    __slots__ = ('__weakref__', '_impl_test')
+    __slots__ = ('__weakref__',)
 
     def __init__(self, descr, session_id=None, persistent=False):
         """ Configuration option management master class
@@ -553,41 +593,6 @@ class Config(CommonConfig):
         #undocumented option used only in test script
         self._impl_test = False
 
-    def __getstate__(self):
-        if self._impl_meta is not None:
-            raise ConfigError('cannot serialize Config with meta')
-        slots = set()
-        for subclass in self.__class__.__mro__:
-            if subclass is not object:
-                slots.update(subclass.__slots__)
-        slots -= frozenset(['_impl_context', '__weakref__'])
-        state = {}
-        for slot in slots:
-            try:
-                state[slot] = getattr(self, slot)
-            except AttributeError:
-                pass
-        storage = self._impl_values._p_._storage
-        if not storage.serializable:
-            raise ConfigError('this storage is not serialisable, could be a '
-                              'none persistent storage')
-        state['_storage'] = {'session_id': storage.session_id,
-                             'persistent': storage.persistent}
-        state['_impl_setting'] = _impl_getstate_setting()
-        return state
-
-    def __setstate__(self, state):
-        for key, value in state.items():
-            if key not in ['_storage', '_impl_setting']:
-                setattr(self, key, value)
-        set_storage(**state['_impl_setting'])
-        self._impl_context = weakref.ref(self)
-        self._impl_settings.context = weakref.ref(self)
-        self._impl_values.context = weakref.ref(self)
-        storage = get_storage(test=self._impl_test, **state['_storage'])
-        self._impl_values._impl_setstate(storage)
-        self._impl_settings._impl_setstate(storage)
-
     def cfgimpl_reset_cache(self,
                             only_expired=False,
                             only=('values', 'settings')):
@@ -597,115 +602,121 @@ class Config(CommonConfig):
             self.cfgimpl_get_settings().reset_cache(only_expired=only_expired)
 
 
-#class MetaConfig(CommonConfig):
-#    __slots__ = ('_impl_children',)
+class GroupConfig(_CommonConfig):
+    __slots__ = ('_impl_children', '__weakref__')
 
-#    def __init__(self, children, meta=True, session_id=None, persistent=False):
-#        if not isinstance(children, list):
-#            raise ValueError(_("metaconfig's children must be a list"))
-#        self._impl_descr = None
-#        self._impl_path = None
-#        if meta:
-#            for child in children:
-#                if not isinstance(child, CommonConfig):
-#                    raise TypeError(_("metaconfig's children "
-#                                      "must be config, not {0}"
-#                                      ).format(type(child)))
-#                if self._impl_descr is None:
-#                    self._impl_descr = child.cfgimpl_get_description()
-#                elif not self._impl_descr is child.cfgimpl_get_description():
-#                    raise ValueError(_('all config in metaconfig must '
-#                                       'have the same optiondescription'))
-#                if child.cfgimpl_get_meta() is not None:
-#                    raise ValueError(_("child has already a metaconfig's"))
-#                child._impl_meta = self
+    def __init__(self, children, session_id=None, persistent=False,
+                 _descr=None):
+        if not isinstance(children, list):
+            raise ValueError(_("metaconfig's children must be a list"))
+        self._impl_children = children
+        settings, values = get_storages(self, session_id, persistent)
+        self._impl_settings = Settings(self, settings)
+        self._impl_values = Values(self, values)
+        super(GroupConfig, self).__init__(_descr, weakref.ref(self))
+        self._impl_meta = None
+        #undocumented option used only in test script
+        self._impl_test = False
 
-#        self._impl_children = children
-#        settings, values = get_storages(self, session_id, persistent)
-#        self._impl_settings = Settings(self, settings)
-#        self._impl_values = Values(self, values)
-#        self._impl_meta = None
+    def cfgimpl_get_children(self):
+        return self._impl_children
 
-#    def cfgimpl_get_children(self):
-#        return self._impl_children
+    #def cfgimpl_get_context(self):
+    #    "a meta config is a config which has a setting, that is itself"
+    #    return self
+    #
+    def cfgimpl_reset_cache(self,
+                            only_expired=False,
+                            only=('values', 'settings')):
+        if 'values' in only:
+            self.cfgimpl_get_values().reset_cache(only_expired=only_expired)
+        if 'settings' in only:
+            self.cfgimpl_get_settings().reset_cache(only_expired=only_expired)
+        for child in self._impl_children:
+            child.cfgimpl_reset_cache(only_expired=only_expired, only=only)
 
-#    def cfgimpl_get_context(self):
-#        "a meta config is a config wich has a setting, that is itself"
-#        return self
+    def setattrs(self, path, value):
+        """Setattr not in current GroupConfig, but in each children
+        """
+        for child in self._impl_children:
+            try:
+                if not isinstance(child, GroupConfig):
+                    setattr(child, path, value)
+                else:
+                    child.setattrs(path, value)
+            except PropertiesOptionError:
+                pass
 
-#    def cfgimpl_reset_cache(self,
-#                            only_expired=False,
-#                            only=('values', 'settings')):
-#        if 'values' in only:
-#            self.cfgimpl_get_values().reset_cache(only_expired=only_expired)
-#        if 'settings' in only:
-#            self.cfgimpl_get_settings().reset_cache(only_expired=only_expired)
-#        for child in self._impl_children:
-#            child.cfgimpl_reset_cache(only_expired=only_expired, only=only)
+    def find_firsts(self, byname=None, bypath=None, byvalue=None,
+                    type_='path', display_error=True):
+        """Find first not in current GroupConfig, but in each children
+        """
+        ret = []
+        #if MetaConfig, all children have same OptionDescription as context
+        #so search only one time for all children
+        try:
+            if bypath is None and byname is not None and \
+                    isinstance(self, MetaConfig):
+                bypath = self._find(bytype=None, byvalue=None, byname=byname,
+                                    first=True, type_='path',
+                                    check_properties=False,
+                                    display_error=display_error)
+                byname = None
+        except AttributeError:
+            pass
+        for child in self._impl_children:
+            try:
+                if not isinstance(child, MetaConfig):
+                    if bypath is not None:
+                        #if byvalue is None, try if not raise
+                        value = getattr(child, bypath)
+                        if byvalue is not None:
+                            if isinstance(value, Multi):
+                                if byvalue in value:
+                                    ret.append(child)
+                            else:
+                                if value == byvalue:
+                                    ret.append(child)
+                        else:
+                            ret.append(child)
+                    else:
+                        ret.append(child.find_first(byname=byname,
+                                                    byvalue=byvalue,
+                                                    type_=type_,
+                                                    display_error=False))
+                else:
+                    ret.extend(child.find_firsts(byname=byname,
+                                                 bypath=bypath,
+                                                 byvalue=byvalue,
+                                                 type_=type_,
+                                                 display_error=False))
+            except AttributeError:
+                pass
+        return self._find_return_results(ret, display_error)
 
-#    def set_contexts(self, path, value):
-#        for child in self._impl_children:
-#            try:
-#                if not isinstance(child, MetaConfig):
-#                    setattr(child, path, value)
-#                else:
-#                    child.set_contexts(path, value)
-#            except PropertiesOptionError:
-#                pass
 
-#    def find_first_contexts(self, byname=None, bypath=None, byvalue=None,
-#                            type_='path', display_error=True):
-#        ret = []
-#        try:
-#            if bypath is None and byname is not None and \
-#                    self.cfgimpl_get_description() is not None:
-#                bypath = self._find(bytype=None, byvalue=None, byname=byname,
-#                                    first=True, type_='path',
-#                                    check_properties=False,
-#                                    display_error=display_error)
-#        except ConfigError:
-#            pass
-#        for child in self._impl_children:
-#            try:
-#                if not isinstance(child, MetaConfig):
-#                    if bypath is not None:
-#                        if byvalue is not None:
-#                            if getattr(child, bypath) == byvalue:
-#                                ret.append(child)
-#                        else:
-#                            #not raise
-#                            getattr(child, bypath)
-#                            ret.append(child)
-#                    else:
-#                        ret.append(child.find_first(byname=byname,
-#                                                    byvalue=byvalue,
-#                                                    type_=type_,
-#                                                    display_error=False))
-#                else:
-#                    ret.extend(child.find_first_contexts(byname=byname,
-#                                                         bypath=bypath,
-#                                                         byvalue=byvalue,
-#                                                         type_=type_,
-#                                                         display_error=False))
-#            except AttributeError:
-#                pass
-#        return self._find_return_results(ret, display_error)
+class MetaConfig(GroupConfig):
+    __slots__ = tuple()
+
+    def __init__(self, children, session_id=None, persistent=False):
+        descr = None
+        for child in children:
+            if not isinstance(child, _CommonConfig):
+                raise TypeError(_("metaconfig's children "
+                                  "should be config, not {0}"
+                                  ).format(type(child)))
+            if child.cfgimpl_get_meta() is not None:
+                raise ValueError(_("child has already a metaconfig's"))
+            if descr is None:
+                descr = child.cfgimpl_get_description()
+            elif not descr is child.cfgimpl_get_description():
+                raise ValueError(_('all config in metaconfig must '
+                                   'have the same optiondescription'))
+            child._impl_meta = weakref.ref(self)
+
+        super(MetaConfig, self).__init__(children, session_id, persistent, descr)
 
 
 def mandatory_warnings(config):
-    """convenience function to trace Options that are mandatory and
-    where no value has been set
-
-    :returns: generator of mandatory Option's path
-
-    """
-    #if value in cache, properties are not calculated
-    config.cfgimpl_reset_cache(only=('values',))
-    for path in config.cfgimpl_get_description().impl_getpaths(
-            include_groups=True):
-        try:
-            config._getattr(path, force_properties=frozenset(('mandatory',)))
-        except PropertiesOptionError as err:
-            if err.proptype == ['mandatory']:
-                yield path
-    config.cfgimpl_reset_cache(only=('values',))
+    #only for retro-compatibility
+    config.cfgimpl_get_values().mandatory_warnings()
diff --git a/tiramisu/option.py b/tiramisu/option.py
index ca143a0..fee61b5 100644
--- a/tiramisu/option.py
+++ b/tiramisu/option.py
@@ -39,9 +39,7 @@ forbidden_names = ('iter_all', 'iter_group', 'find', 'find_first',
 
 def valid_name(name):
     "an option's name is a str and does not start with 'impl' or 'cfgimpl'"
-    try:
-        name = str(name)
-    except:
+    if not isinstance(name, str):
         return False
     if re.match(name_regexp, name) is None and not name.startswith('_') \
             and name not in forbidden_names \
@@ -337,7 +335,7 @@ class Option(BaseOption):
         self._consistencies = None
 
     def _launch_consistency(self, func, option, value, context, index,
-                            all_cons_opts):
+                            all_cons_opts, warnings_only):
         """Launch consistency now
 
         :param func: function name, this name should start with _cons_
@@ -352,12 +350,11 @@ class Option(BaseOption):
         :type index: `int`
         :param all_cons_opts: all options concerne by this consistency
         :type all_cons_opts: `list` of `tiramisu.option.Option`
+        :param warnings_only: specific raise error for warning
+        :type warnings_only: `boolean`
         """
         if context is not None:
             descr = context.cfgimpl_get_description()
-        #option is also in all_cons_opts
-        if option not in all_cons_opts:
-            raise ConfigError(_('option not in all_cons_opts'))
 
         all_cons_vals = []
         for opt in all_cons_opts:
@@ -368,7 +365,8 @@ class Option(BaseOption):
                 #if context, calculate value, otherwise get default value
                 if context is not None:
                     opt_value = context._getattr(
-                        descr.impl_get_path_by_opt(opt), validate=False)
+                        descr.impl_get_path_by_opt(opt), validate=False,
+                        force_permissive=True)
                 else:
                     opt_value = opt.impl_getdefault()
 
@@ -382,7 +380,7 @@ class Option(BaseOption):
                 except IndexError:
                     #so return if no value
                     return
-        getattr(self, func)(all_cons_opts, all_cons_vals)
+        getattr(self, func)(all_cons_opts, all_cons_vals, warnings_only)
 
     def impl_validate(self, value, context=None, validate=True,
                       force_index=None):
@@ -412,7 +410,7 @@ class Option(BaseOption):
                 else:
                     validator_params = {'': (val,)}
                 # Raise ValueError if not valid
-                carry_out_calculation(self._name, config=context,
+                carry_out_calculation(self, config=context,
                                       callback=self._validator[0],
                                       callback_params=validator_params)
 
@@ -420,23 +418,41 @@ class Option(BaseOption):
             if _value is None:
                 return
             # option validation
-            self._validate(_value)
+            try:
+                self._validate(_value)
+            except ValueError as err:
+                raise ValueError(_('invalid value for option {0}: {1}'
+                                   '').format(self._name, err))
+            error = None
+            warning = None
             try:
                 # valid with self._validator
                 val_validator(_value)
-                # if not context launch consistency validation
-                if context is not None:
-                    descr._valid_consistency(self, _value, context, _index)
-                self._second_level_validation(_value)
-            except ValueError as err:
-                msg = _("invalid value {0} for option {1}: {2}").format(
-                    _value, self._name, err)
+                self._second_level_validation(_value, self._warnings_only)
+            except ValueError as error:
                 if self._warnings_only:
-                    warnings.warn_explicit(ValueWarning(msg, self),
-                                           ValueWarning,
-                                           self.__class__.__name__, 0)
-                else:
-                    raise ValueError(msg)
+                    warning = error
+                    error = None
+            except ValueWarning as warning:
+                pass
+            if error is None and warning is None:
+                try:
+                    # if context launch consistency validation
+                    if context is not None:
+                        descr._valid_consistency(self, _value, context, _index)
+                except ValueError as error:
+                    pass
+                except ValueWarning as warning:
+                    pass
+            if warning:
+                msg = _("warning on the value of the option {0}: {1}").format(
+                    self._name, warning)
+                warnings.warn_explicit(ValueWarning(msg, self),
+                                       ValueWarning,
+                                       self.__class__.__name__, 0)
+            elif error:
+                raise ValueError(_("invalid value for option {0}: {1}").format(
+                    self._name, error))
 
         # generic calculation
         if context is not None:
@@ -446,17 +462,13 @@ class Option(BaseOption):
             do_validation(value, force_index)
         else:
             if not isinstance(value, list):
-                raise ValueError(_("which must be a list").format(value,
-                                                                  self._name))
+                raise ValueError(_("invalid value {0} for option {1} which must be a list").format(value, self._name))
             for index, val in enumerate(value):
                 do_validation(val, index)
 
-    def impl_getdefault(self, default_multi=False):
+    def impl_getdefault(self):
         "accessing the default value"
-        if not default_multi or not self.impl_is_multi():
-            return self._default
-        else:
-            return self.getdefault_multi()
+        return self._default
 
     def impl_getdefault_multi(self):
         "accessing the default value for a multi"
@@ -493,7 +505,7 @@ class Option(BaseOption):
     def impl_is_multi(self):
         return self._multi
 
-    def impl_add_consistency(self, func, *other_opts):
+    def impl_add_consistency(self, func, *other_opts, **params):
         """Add consistency means that value will be validate with other_opts
         option's values.
 
@@ -501,16 +513,18 @@ class Option(BaseOption):
         :type func: `str`
         :param other_opts: options used to validate value
         :type other_opts: `list` of `tiramisu.option.Option`
+        :param params: extra params (only warnings_only are allowed)
         """
         if self._consistencies is None:
             self._consistencies = []
+        warnings_only = params.get('warnings_only', False)
         for opt in other_opts:
             if not isinstance(opt, Option):
-                raise ConfigError(_('consistency should be set with an option'))
+                raise ConfigError(_('consistency must be set with an option'))
             if self is opt:
                 raise ConfigError(_('cannot add consistency with itself'))
             if self.impl_is_multi() != opt.impl_is_multi():
-                raise ConfigError(_('every options in consistency should be '
+                raise ConfigError(_('every options in consistency must be '
                                     'multi or none'))
         func = '_cons_{0}'.format(func)
         all_cons_opts = tuple([self] + list(other_opts))
@@ -519,19 +533,23 @@ class Option(BaseOption):
             if self.impl_is_multi():
                 for idx, val in enumerate(value):
                     self._launch_consistency(func, self, val, None,
-                                             idx, all_cons_opts)
+                                             idx, all_cons_opts, warnings_only)
             else:
                 self._launch_consistency(func, self, value, None,
-                                         None, all_cons_opts)
-        self._consistencies.append((func, all_cons_opts))
+                                         None, all_cons_opts, warnings_only)
+        self._consistencies.append((func, all_cons_opts, params))
         self.impl_validate(self.impl_getdefault())
 
-    def _cons_not_equal(self, opts, vals):
+    def _cons_not_equal(self, opts, vals, warnings_only):
         for idx_inf, val_inf in enumerate(vals):
             for idx_sup, val_sup in enumerate(vals[idx_inf + 1:]):
                 if val_inf == val_sup is not None:
-                    raise ValueError(_("same value for {0} and {1}").format(
-                        opts[idx_inf]._name, opts[idx_inf + idx_sup + 1]._name))
+                    if warnings_only:
+                        msg = _("same value for {0} and {1}, should be different")
+                    else:
+                        msg = _("same value for {0} and {1}, must be different")
+                    raise ValueError(msg.format(opts[idx_inf]._name,
+                                                opts[idx_inf + idx_sup + 1]._name))
 
     def _impl_convert_callbacks(self, descr, load=False):
         if not load and self._callback is None:
@@ -587,38 +605,22 @@ class Option(BaseOption):
                 consistencies = self._state_consistencies
             else:
                 consistencies = self._consistencies
-            if isinstance(consistencies, list):
-                new_value = []
-                for consistency in consistencies:
-                    values = []
-                    for obj in consistency[1]:
-                        if load:
-                            values.append(descr.impl_get_opt_by_path(obj))
-                        else:
-                            values.append(descr.impl_get_path_by_opt(obj))
-                    new_value.append((consistency[0], tuple(values)))
-
-            else:
-                new_value = {}
-                for key, _consistencies in consistencies.items():
-                    new_value[key] = []
-                    for key_cons, _cons in _consistencies:
-                        _list_cons = []
-                        for _con in _cons:
-                            if load:
-                                _list_cons.append(
-                                    descr.impl_get_opt_by_path(_con))
-                            else:
-                                _list_cons.append(
-                                    descr.impl_get_path_by_opt(_con))
-                        new_value[key].append((key_cons, tuple(_list_cons)))
+            new_value = []
+            for consistency in consistencies:
+                values = []
+                for obj in consistency[1]:
+                    if load:
+                        values.append(descr.impl_get_opt_by_path(obj))
+                    else:
+                        values.append(descr.impl_get_path_by_opt(obj))
+                new_value.append((consistency[0], tuple(values), consistency[2]))
             if load:
                 del(self._state_consistencies)
                 self._consistencies = new_value
             else:
                 self._state_consistencies = new_value
 
-    def _second_level_validation(self, value):
+    def _second_level_validation(self, value, warnings_only):
         pass
 
 
@@ -663,7 +665,7 @@ class ChoiceOption(Option):
         return self._open_values
 
     def _validate(self, value):
-        if not self._open_values and not value in self._values:
+        if not self.impl_is_openvalues() and not value in self.impl_get_values():
             raise ValueError(_('value {0} is not permitted, '
                                'only {1} is allowed'
                                '').format(value, self._values))
@@ -676,7 +678,7 @@ class BoolOption(Option):
 
     def _validate(self, value):
         if not isinstance(value, bool):
-            raise ValueError(_('value must be a boolean'))
+            raise ValueError(_('invalid boolean'))
 
 
 class IntOption(Option):
@@ -686,7 +688,7 @@ class IntOption(Option):
 
     def _validate(self, value):
         if not isinstance(value, int):
-            raise ValueError(_('value must be an integer'))
+            raise ValueError(_('invalid integer'))
 
 
 class FloatOption(Option):
@@ -696,7 +698,7 @@ class FloatOption(Option):
 
     def _validate(self, value):
         if not isinstance(value, float):
-            raise ValueError(_('value must be a float'))
+            raise ValueError(_('invalid float'))
 
 
 class StrOption(Option):
@@ -706,12 +708,11 @@ class StrOption(Option):
 
     def _validate(self, value):
         if not isinstance(value, str):
-            raise ValueError(_('value must be a string, not '
-                               '{0}').format(type(value)))
+            raise ValueError(_('invalid string'))
 
 
 if sys.version_info[0] >= 3:
-    #UnicodeOption is same has StrOption in python 3+
+    #UnicodeOption is same as StrOption in python 3+
     class UnicodeOption(StrOption):
         __slots__ = tuple()
         pass
@@ -724,7 +725,7 @@ else:
 
         def _validate(self, value):
             if not isinstance(value, unicode):
-                raise ValueError(_('value must be an unicode'))
+                raise ValueError(_('invalid unicode'))
 
 
 class SymLinkOption(BaseOption):
@@ -782,17 +783,51 @@ class IPOption(Option):
                                        warnings_only=warnings_only)
 
     def _validate(self, value):
+        # sometimes an ip term starts with a zero
+        # but this does not fit in some case, for example bind does not like it
+        try:
+            for val in value.split('.'):
+                if val.startswith("0") and len(val) > 1:
+                    raise ValueError(_('invalid IP'))
+        except AttributeError:
+            #if integer for example
+            raise ValueError(_('invalid IP'))
+        # 'standard' validation
         try:
             IP('{0}/32'.format(value))
         except ValueError:
-            raise ValueError(_('invalid IP {0}').format(self._name))
+            raise ValueError(_('invalid IP'))
 
-    def _second_level_validation(self, value):
+    def _second_level_validation(self, value, warnings_only):
         ip = IP('{0}/32'.format(value))
         if not self._allow_reserved and ip.iptype() == 'RESERVED':
-            raise ValueError(_("IP mustn't not be in reserved class"))
+            if warnings_only:
+                msg = _("IP shouldn't be in reserved class")
+            else:
+                msg = _("invalid IP, mustn't be in reserved class")
+            raise ValueError(msg)
         if self._private_only and not ip.iptype() == 'PRIVATE':
-            raise ValueError(_("IP must be in private class"))
+            if warnings_only:
+                msg = _("IP should be in private class")
+            else:
+                msg = _("invalid IP, must be in private class")
+            raise ValueError(msg)
+
+    def _cons_in_network(self, opts, vals, warnings_only):
+        if len(vals) != 3:
+            raise ConfigError(_('invalid len for vals'))
+        if None in vals:
+            return
+        ip, network, netmask = vals
+        if IP(ip) not in IP('{0}/{1}'.format(network, netmask)):
+            if warnings_only:
+                msg = _('IP {0} ({1}) not in network {2} ({3}) with netmask {4}'
+                        ' ({5})')
+            else:
+                msg = _('invalid IP {0} ({1}) not in network {2} ({3}) with '
+                        'netmask {4} ({5})')
+            raise ValueError(msg.format(ip, opts[0]._name, network,
+                             opts[1]._name, netmask, opts[2]._name))
 
 
 class PortOption(Option):
@@ -852,17 +887,23 @@ class PortOption(Option):
         if self._allow_range and ":" in str(value):
             value = str(value).split(':')
             if len(value) != 2:
-                raise ValueError('range must have two values only')
+                raise ValueError(_('invalid port, range must have two values '
+                                 'only'))
             if not value[0] < value[1]:
-                raise ValueError('first port in range must be'
-                                 ' smaller than the second one')
+                raise ValueError(_('invalid port, first port in range must be'
+                                 ' smaller than the second one'))
         else:
             value = [value]
 
         for val in value:
+            try:
+                int(val)
+            except ValueError:
+                raise ValueError(_('invalid port'))
             if not self._min_value <= int(val) <= self._max_value:
-                raise ValueError('port must be an between {0} and {1}'
-                                 ''.format(self._min_value, self._max_value))
+                raise ValueError(_('invalid port, must be an between {0} '
+                                   'and {1}').format(self._min_value,
+                                                     self._max_value))
 
 
 class NetworkOption(Option):
@@ -874,12 +915,16 @@ class NetworkOption(Option):
         try:
             IP(value)
         except ValueError:
-            raise ValueError(_('invalid network address {0}').format(self._name))
+            raise ValueError(_('invalid network address'))
 
-    def _second_level_validation(self, value):
+    def _second_level_validation(self, value, warnings_only):
         ip = IP(value)
         if ip.iptype() == 'RESERVED':
-            raise ValueError(_("network shall not be in reserved class"))
+            if warnings_only:
+                msg = _("network address shouldn't be in reserved class")
+            else:
+                msg = _("invalid network address, mustn't be in reserved class")
+            raise ValueError(msg)
 
 
 class NetmaskOption(Option):
@@ -891,21 +936,22 @@ class NetmaskOption(Option):
         try:
             IP('0.0.0.0/{0}'.format(value))
         except ValueError:
-            raise ValueError(_('invalid netmask address {0}').format(self._name))
+            raise ValueError(_('invalid netmask address'))
 
-    def _cons_network_netmask(self, opts, vals):
+    def _cons_network_netmask(self, opts, vals, warnings_only):
         #opts must be (netmask, network) options
         if None in vals:
             return
-        self.__cons_netmask(opts, vals[0], vals[1], False)
+        self.__cons_netmask(opts, vals[0], vals[1], False, warnings_only)
 
-    def _cons_ip_netmask(self, opts, vals):
+    def _cons_ip_netmask(self, opts, vals, warnings_only):
         #opts must be (netmask, ip) options
         if None in vals:
             return
-        self.__cons_netmask(opts, vals[0], vals[1], True)
+        self.__cons_netmask(opts, vals[0], vals[1], True, warnings_only)
 
-    def __cons_netmask(self, opts, val_netmask, val_ipnetwork, make_net):
+    def __cons_netmask(self, opts, val_netmask, val_ipnetwork, make_net,
+                       warnings_only):
         if len(opts) != 2:
             raise ConfigError(_('invalid len for opts'))
         msg = None
@@ -918,23 +964,18 @@ class NetmaskOption(Option):
                     IP('{0}/{1}'.format(val_ipnetwork, val_netmask),
                         make_net=not make_net)
                 except ValueError:
-                    if not make_net:
-                        msg = _("invalid network {0} ({1}) "
-                                "with netmask {2} ({3}),"
-                                " this network is an IP")
+                    pass
                 else:
                     if make_net:
-                        msg = _("invalid IP {0} ({1}) with netmask {2} ({3}),"
+                        msg = _("invalid IP {0} ({1}) with netmask {2},"
                                 " this IP is a network")
 
         except ValueError:
-            if make_net:
-                msg = _("invalid IP {0} ({1}) with netmask {2} ({3})")
-            else:
-                msg = _("invalid network {0} ({1}) with netmask {2} ({3})")
+            if not make_net:
+                msg = _('invalid network {0} ({1}) with netmask {2}')
         if msg is not None:
             raise ValueError(msg.format(val_ipnetwork, opts[1]._name,
-                                        val_netmask, self._name))
+                                        val_netmask))
 
 
 class BroadcastOption(Option):
@@ -945,9 +986,9 @@ class BroadcastOption(Option):
         try:
             IP('{0}/32'.format(value))
         except ValueError:
-            raise ValueError(_('invalid broadcast address {0}').format(self._name))
+            raise ValueError(_('invalid broadcast address'))
 
-    def _cons_broadcast(self, opts, vals):
+    def _cons_broadcast(self, opts, vals, warnings_only):
         if len(vals) != 3:
             raise ConfigError(_('invalid len for vals'))
         if None in vals:
@@ -967,20 +1008,44 @@ class DomainnameOption(Option):
     domainname:
     fqdn: with tld, not supported yet
     """
-    __slots__ = ('_type', '_allow_ip')
+    __slots__ = ('_type', '_allow_ip', '_allow_without_dot', '_domain_re')
     _opt_type = 'domainname'
 
     def __init__(self, name, doc, default=None, default_multi=None,
                  requires=None, multi=False, callback=None,
                  callback_params=None, validator=None, validator_params=None,
                  properties=None, allow_ip=False, type_='domainname',
-                 warnings_only=False):
+                 warnings_only=False, allow_without_dot=False):
         if type_ not in ['netbios', 'hostname', 'domainname']:
             raise ValueError(_('unknown type_ {0} for hostname').format(type_))
         self._type = type_
         if allow_ip not in [True, False]:
             raise ValueError(_('allow_ip must be a boolean'))
+        if allow_without_dot not in [True, False]:
+            raise ValueError(_('allow_without_dot must be a boolean'))
         self._allow_ip = allow_ip
+        self._allow_without_dot = allow_without_dot
+        end = ''
+        extrachar = ''
+        extrachar_mandatory = ''
+        if self._type != 'netbios':
+            allow_number = '\d'
+        else:
+            allow_number = ''
+        if self._type == 'netbios':
+            length = 14
+        elif self._type == 'hostname':
+            length = 62
+        elif self._type == 'domainname':
+            length = 62
+            if allow_without_dot is False:
+                extrachar_mandatory = '\.'
+            else:
+                extrachar = '\.'
+            end = '+[a-z]*'
+        self._domain_re = re.compile(r'^(?:[a-z{0}][a-z\d\-{1}]{{,{2}}}{3}){4}$'
+                                     ''.format(allow_number, extrachar, length,
+                                               extrachar_mandatory, end))
         super(DomainnameOption, self).__init__(name, doc, default=default,
                                                default_multi=default_multi,
                                                callback=callback,
@@ -999,29 +1064,94 @@ class DomainnameOption(Option):
                 return
             except ValueError:
                 pass
-        if self._type == 'netbios':
-            length = 15
-            extrachar = ''
-        elif self._type == 'hostname':
-            length = 63
-            extrachar = ''
-        elif self._type == 'domainname':
-            length = 255
-            extrachar = '\.'
-            if '.' not in value:
-                raise ValueError(_("invalid value for {0}, must have dot"
-                                   "").format(self._name))
-        if len(value) > length:
-            raise ValueError(_("invalid domainname's length for"
-                               " {0} (max {1})").format(self._name, length))
-        if len(value) == 1:
-            raise ValueError(_("invalid domainname's length for {0} (min 2)"
-                               "").format(self._name))
-        regexp = r'^[a-z]([a-z\d{0}-])*[a-z\d]$'.format(extrachar)
-        if re.match(regexp, value) is None:
+        if self._type == 'domainname' and not self._allow_without_dot and \
+                '.' not in value:
+            raise ValueError(_("invalid domainname, must have dot"))
+        if len(value) > 255:
+            raise ValueError(_("invalid domainname's length (max 255)"))
+        if len(value) < 2:
+            raise ValueError(_("invalid domainname's length (min 2)"))
+        if not self._domain_re.search(value):
             raise ValueError(_('invalid domainname'))
 
 
+class EmailOption(DomainnameOption):
+    __slots__ = tuple()
+    _opt_type = 'email'
+    username_re = re.compile(r"^[\w!#$%&'*+\-/=?^`{|}~.]+$")
+
+    def _validate(self, value):
+        splitted = value.split('@', 1)
+        try:
+            username, domain = splitted
+        except ValueError:
+            raise ValueError(_('invalid email address, must contains one @'
+                               ))
+        if not self.username_re.search(username):
+            raise ValueError(_('invalid username in email address'))
+        super(EmailOption, self)._validate(domain)
+
+
+class URLOption(DomainnameOption):
+    __slots__ = tuple()
+    _opt_type = 'url'
+    proto_re = re.compile(r'(http|https)://')
+    path_re = re.compile(r"^[a-z0-9\-\._~:/\?#\[\]@!%\$&\'\(\)\*\+,;=]+$")
+
+    def _validate(self, value):
+        match = self.proto_re.search(value)
+        if not match:
+            raise ValueError(_('invalid url, must start with http:// or '
+                               'https://'))
+        value = value[len(match.group(0)):]
+        # get domain/files
+        splitted = value.split('/', 1)
+        try:
+            domain, files = splitted
+        except ValueError:
+            domain = value
+            files = None
+        # if port in domain
+        splitted = domain.split(':', 1)
+        try:
+            domain, port = splitted
+
+        except ValueError:
+            domain = splitted[0]
+            port = 0
+        if not 0 <= int(port) <= 65535:
+            raise ValueError(_('invalid url, port must be an between 0 and '
+                               '65536'))
+        # validate domainname
+        super(URLOption, self)._validate(domain)
+        # validate file
+        if files is not None and files != '' and not self.path_re.search(files):
+            raise ValueError(_('invalid url, must ends with filename'))
+
+
+class UsernameOption(Option):
+    __slots__ = tuple()
+    _opt_type = 'username'
+    #regexp build with 'man 8 adduser' informations
+    username_re = re.compile(r"^[a-z_][a-z0-9_-]{0,30}[$a-z0-9_-]{0,1}$")
+
+    def _validate(self, value):
+        match = self.username_re.search(value)
+        if not match:
+            raise ValueError(_('invalid username'))
+
+
+class FilenameOption(Option):
+    __slots__ = tuple()
+    _opt_type = 'file'
+    path_re = re.compile(r"^[a-zA-Z0-9\-\._~/+]+$")
+
+    def _validate(self, value):
+        match = self.path_re.search(value)
+        if not match:
+            raise ValueError(_('invalid filename'))
+
+
 class OptionDescription(BaseOption):
     """Config's schema (organisation, group) and container of Options
     The `OptionsDescription` objects lives in the `tiramisu.config.Config`.
@@ -1125,11 +1255,12 @@ class OptionDescription(BaseOption):
                 if not force_no_consistencies and \
                         option._consistencies is not None:
                     for consistency in option._consistencies:
-                        func, all_cons_opts = consistency
+                        func, all_cons_opts, params = consistency
                         for opt in all_cons_opts:
                             _consistencies.setdefault(opt,
                                                       []).append((func,
-                                                                  all_cons_opts))
+                                                                  all_cons_opts,
+                                                                  params))
             else:
                 _currpath.append(attr)
                 option.impl_build_cache(cache_path,
@@ -1176,7 +1307,6 @@ class OptionDescription(BaseOption):
             self._group_type = group_type
             if isinstance(group_type, groups.MasterGroupType):
                 #if master (same name has group) is set
-                identical_master_child_name = False
                 #for collect all slaves
                 slaves = []
                 master = None
@@ -1193,7 +1323,6 @@ class OptionDescription(BaseOption):
                                          ": this option is not a multi"
                                          "").format(child._name, self._name))
                     if child._name == self._name:
-                        identical_master_child_name = True
                         child._multitype = multitypes.master
                         master = child
                     else:
@@ -1202,14 +1331,18 @@ class OptionDescription(BaseOption):
                     raise ValueError(_('master group with wrong'
                                        ' master name for {0}'
                                        ).format(self._name))
+                if master._callback is not None and master._callback[1] is not None:
+                    for key, callbacks in master._callback[1].items():
+                        for callbk in callbacks:
+                            if isinstance(callbk, tuple):
+                                if callbk[0] in slaves:
+                                    raise ValueError(_("callback of master's option shall "
+                                                       "not refered a slave's ones"))
                 master._master_slaves = tuple(slaves)
                 for child in self.impl_getchildren():
                     if child != master:
                         child._master_slaves = master
                         child._multitype = multitypes.slave
-                if not identical_master_child_name:
-                    raise ValueError(_("no child has same nom has master group"
-                                       " for: {0}").format(self._name))
         else:
             raise ValueError(_('group_type: {0}'
                                ' not allowed').format(group_type))
@@ -1223,15 +1356,20 @@ class OptionDescription(BaseOption):
         #consistencies is something like [('_cons_not_equal', (opt1, opt2))]
         consistencies = self._cache_consistencies.get(option)
         if consistencies is not None:
-            for func, all_cons_opts in consistencies:
+            for func, all_cons_opts, params in consistencies:
+                warnings_only = params.get('warnings_only', False)
                 #all_cons_opts[0] is the option where func is set
-                ret = all_cons_opts[0]._launch_consistency(func, option,
-                                                           value,
-                                                           context, index,
-                                                           all_cons_opts)
-                if ret is False:
-                    return False
-        return True
+                try:
+                    all_cons_opts[0]._launch_consistency(func, option,
+                                                         value,
+                                                         context, index,
+                                                         all_cons_opts,
+                                                         warnings_only)
+                except ValueError as err:
+                    if warnings_only:
+                        raise ValueWarning(err.message, option)
+                    else:
+                        raise err
 
     def _impl_getstate(self, descr=None):
         """enables us to export into a dict
@@ -1341,7 +1479,7 @@ def validate_requires_arg(requires, name):
                                'must be an option in option {0}').format(name))
         if option.impl_is_multi():
             raise ValueError(_('malformed requirements option {0} '
-                               'should not be a multi').format(name))
+                               'must not be a multi').format(name))
         if expected is not None:
             try:
                 option._validate(expected)
@@ -1376,17 +1514,17 @@ def validate_requires_arg(requires, name):
 
 def validate_callback(callback, callback_params, type_):
     if type(callback) != FunctionType:
-        raise ValueError(_('{0} should be a function').format(type_))
+        raise ValueError(_('{0} must be a function').format(type_))
     if callback_params is not None:
         if not isinstance(callback_params, dict):
-            raise ValueError(_('{0}_params should be a dict').format(type_))
+            raise ValueError(_('{0}_params must be a dict').format(type_))
         for key, callbacks in callback_params.items():
             if key != '' and len(callbacks) != 1:
-                raise ValueError(_('{0}_params with key {1} should not have '
-                                   'length different to 1').format(type_,
+                raise ValueError(_("{0}_params with key {1} mustn't have "
+                                   "length different to 1").format(type_,
                                                                    key))
             if not isinstance(callbacks, tuple):
-                raise ValueError(_('{0}_params should be tuple for key "{1}"'
+                raise ValueError(_('{0}_params must be tuple for key "{1}"'
                                    ).format(type_, key))
             for callbk in callbacks:
                 if isinstance(callbk, tuple):
@@ -1395,11 +1533,11 @@ def validate_callback(callback, callback_params, type_):
                         raise ValueError(_('validator not support tuple'))
                     if not isinstance(option, Option) and not \
                             isinstance(option, SymLinkOption):
-                        raise ValueError(_('{0}_params should have an option '
+                        raise ValueError(_('{0}_params must have an option '
                                            'not a {0} for first argument'
                                            ).format(type_, type(option)))
                     if force_permissive not in [True, False]:
-                        raise ValueError(_('{0}_params should have a boolean'
+                        raise ValueError(_('{0}_params must have a boolean'
                                            ' not a {0} for second argument'
                                            ).format(type_, type(
                                                force_permissive)))
diff --git a/tiramisu/setting.py b/tiramisu/setting.py
index bea7b7a..6ba84d7 100644
--- a/tiramisu/setting.py
+++ b/tiramisu/setting.py
@@ -19,7 +19,7 @@ from time import time
 from copy import copy
 import weakref
 from tiramisu.error import (RequirementError, PropertiesOptionError,
-                            ConstError)
+                            ConstError, ConfigError)
 from tiramisu.i18n import _
 
 
@@ -237,6 +237,14 @@ multitypes = MultiTypeModule()
 populate_multitypes()
 
 
+# ____________________________________________________________
+class Undefined():
+    pass
+
+
+undefined = Undefined()
+
+
 # ____________________________________________________________
 class Property(object):
     "a property is responsible of the option's value access rules"
@@ -249,6 +257,11 @@ class Property(object):
         self._properties = prop
 
     def append(self, propname):
+        """Appends a property named propname
+
+        :param propname: a predefined or user defined property name
+        :type propname: string
+        """
         if self._opt is not None and self._opt._calc_properties is not None \
                 and propname in self._opt._calc_properties:
             raise ValueError(_('cannot append {0} property for option {1}: '
@@ -258,12 +271,29 @@ class Property(object):
         self._setting._setproperties(self._properties, self._opt, self._path)
 
     def remove(self, propname):
+        """Removes a property named propname
+
+        :param propname: a predefined or user defined property name
+        :type propname: string
+        """
         if propname in self._properties:
             self._properties.remove(propname)
             self._setting._setproperties(self._properties, self._opt,
                                          self._path)
 
+    def extend(self, propnames):
+        """Extends properties to the existing properties
+
+        :param propnames: an iterable made of property names
+        :type propnames: iterable of string
+        """
+        for propname in propnames:
+            self.append(propname)
+
     def reset(self):
+        """resets the properties (does not **clear** the properties,
+        default properties are still present)
+        """
         self._setting.reset(_path=self._path)
 
     def __contains__(self, propname):
@@ -275,7 +305,7 @@ class Property(object):
 
 #____________________________________________________________
 class Settings(object):
-    "``Config()``'s configuration options"
+    "``config.Config()``'s configuration options settings"
     __slots__ = ('context', '_owner', '_p_', '__weakref__')
 
     def __init__(self, context, storage):
@@ -293,6 +323,17 @@ class Settings(object):
         self.context = weakref.ref(context)
         self._p_ = storage
 
+    def _getcontext(self):
+        """context could be None, we need to test it
+        context is None only if all reference to `Config` object is deleted
+        (for example we delete a `Config` and we manipulate a reference to
+        old `SubConfig`, `Values`, `Multi` or `Settings`)
+        """
+        context = self.context()
+        if context is None:
+            raise ConfigError(_('the context does not exist anymore'))
+        return context
+
     #____________________________________________________________
     # properties methods
     def __contains__(self, propname):
@@ -317,16 +358,16 @@ class Settings(object):
             raise ValueError(_('opt and all_properties must not be set '
                                'together in reset'))
         if all_properties:
-            self._p_.reset_all_propertives()
+            self._p_.reset_all_properties()
         else:
             if opt is not None and _path is None:
                 _path = self._get_path_by_opt(opt)
             self._p_.reset_properties(_path)
-        self.context().cfgimpl_reset_cache()
+        self._getcontext().cfgimpl_reset_cache()
 
     def _getproperties(self, opt=None, path=None, is_apply_req=True):
         if opt is None:
-            props = self._p_.getproperties(path, default_properties)
+            props = copy(self._p_.getproperties(path, default_properties))
         else:
             if path is None:
                 raise ValueError(_('if opt is not None, path should not be'
@@ -337,8 +378,8 @@ class Settings(object):
                     ntime = int(time())
                 is_cached, props = self._p_.getcache(path, ntime)
                 if is_cached:
-                    return props
-            props = self._p_.getproperties(path, opt._properties)
+                    return copy(props)
+            props = copy(self._p_.getproperties(path, opt._properties))
             if is_apply_req:
                 props |= self.apply_requires(opt, path)
             if 'cache' in self:
@@ -346,7 +387,7 @@ class Settings(object):
                     if  ntime is None:
                         ntime = int(time())
                     ntime = ntime + expires_time
-                self._p_.setcache(path, props, ntime)
+                self._p_.setcache(path, copy(props), ntime)
         return props
 
     def append(self, propname):
@@ -362,6 +403,10 @@ class Settings(object):
             props.remove(propname)
             self._setproperties(props, None, None)
 
+    def extend(self, propnames):
+        for propname in propnames:
+            self.append(propname)
+
     def _setproperties(self, properties, opt, path):
         """save properties for specified opt
         (never save properties if same has option properties)
@@ -375,7 +420,7 @@ class Settings(object):
                 self._p_.reset_properties(path)
             else:
                 self._p_.setproperties(path, properties)
-        self.context().cfgimpl_reset_cache()
+        self._getcontext().cfgimpl_reset_cache()
 
     #____________________________________________________________
     def validate_properties(self, opt_or_descr, is_descr, is_write, path,
@@ -400,11 +445,13 @@ class Settings(object):
                          (typically with the `frozen` property)
         """
         # opt properties
-        properties = copy(self._getproperties(opt_or_descr, path))
+        properties = self._getproperties(opt_or_descr, path)
+        self_properties = self._getproperties()
         # remove opt permissive
+        # permissive affect option's permission with or without permissive
+        # global property
         properties -= self._p_.getpermissive(path)
         # remove global permissive if need
-        self_properties = copy(self._getproperties())
         if force_permissive is True or 'permissive' in self_properties:
             properties -= self._p_.getpermissive()
         if force_permissives is not None:
@@ -421,7 +468,7 @@ class Settings(object):
             properties -= frozenset(('mandatory', 'frozen'))
         else:
             if 'mandatory' in properties and \
-                    not self.context().cfgimpl_get_values()._isempty(
+                    not self._getcontext().cfgimpl_get_values()._isempty(
                         opt_or_descr, value):
                 properties.remove('mandatory')
             if is_write and 'everything_frozen' in self_properties:
@@ -544,6 +591,7 @@ class Settings(object):
 
         # filters the callbacks
         calc_properties = set()
+        context = self._getcontext()
         for requires in opt._requires:
             for require in requires:
                 option, expected, action, inverse, \
@@ -555,8 +603,7 @@ class Settings(object):
                                              " '{0}' with requirement on: "
                                              "'{1}'").format(path, reqpath))
                 try:
-                    value = self.context()._getattr(reqpath,
-                                                    force_permissive=True)
+                    value = context._getattr(reqpath, force_permissive=True)
                 except PropertiesOptionError as err:
                     if not transitive:
                         continue
@@ -585,7 +632,7 @@ class Settings(object):
         :param opt: `Option`'s object
         :returns: path
         """
-        return self.context().cfgimpl_get_description().impl_get_path_by_opt(opt)
+        return self._getcontext().cfgimpl_get_description().impl_get_path_by_opt(opt)
 
     def get_modified_properties(self):
         return self._p_.get_modified_properties()
diff --git a/tiramisu/storage/dictionary/setting.py b/tiramisu/storage/dictionary/setting.py
index 73758f4..a25c989 100644
--- a/tiramisu/storage/dictionary/setting.py
+++ b/tiramisu/storage/dictionary/setting.py
@@ -29,7 +29,7 @@ class Settings(Cache):
         self._permissives = {}
         super(Settings, self).__init__(storage)
 
-    # propertives
+    # properties
     def setproperties(self, path, properties):
         self._properties[path] = properties
 
@@ -39,7 +39,7 @@ class Settings(Cache):
     def hasproperties(self, path):
         return path in self._properties
 
-    def reset_all_propertives(self):
+    def reset_all_properties(self):
         self._properties.clear()
 
     def reset_properties(self, path):
diff --git a/tiramisu/storage/sqlite3/setting.py b/tiramisu/storage/sqlite3/setting.py
index 0b71dd2..a4478d2 100644
--- a/tiramisu/storage/sqlite3/setting.py
+++ b/tiramisu/storage/sqlite3/setting.py
@@ -31,7 +31,7 @@ class Settings(Sqlite3DB):
         self._storage.execute(settings_table, commit=False)
         self._storage.execute(permissives_table)
 
-    # propertives
+    # properties
     def setproperties(self, path, properties):
         path = self._sqlite_encode_path(path)
         self._storage.execute("DELETE FROM property WHERE path = ?", (path,),
@@ -54,7 +54,7 @@ class Settings(Sqlite3DB):
         return self._storage.select("SELECT properties FROM property WHERE "
                                     "path = ?", (path,)) is not None
 
-    def reset_all_propertives(self):
+    def reset_all_properties(self):
         self._storage.execute("DELETE FROM property")
 
     def reset_properties(self, path):
diff --git a/tiramisu/value.py b/tiramisu/value.py
index 7fd34db..968f0e4 100644
--- a/tiramisu/value.py
+++ b/tiramisu/value.py
@@ -19,8 +19,8 @@ from time import time
 from copy import copy
 import sys
 import weakref
-from tiramisu.error import ConfigError, SlaveError
-from tiramisu.setting import owners, multitypes, expires_time
+from tiramisu.error import ConfigError, SlaveError, PropertiesOptionError
+from tiramisu.setting import owners, multitypes, expires_time, undefined
 from tiramisu.autolib import carry_out_calculation
 from tiramisu.i18n import _
 from tiramisu.option import SymLinkOption
@@ -44,15 +44,28 @@ class Values(object):
         # the storage type is dictionary or sqlite3
         self._p_ = storage
 
+    def _getcontext(self):
+        """context could be None, we need to test it
+        context is None only if all reference to `Config` object is deleted
+        (for example we delete a `Config` and we manipulate a reference to
+        old `SubConfig`, `Values`, `Multi` or `Settings`)
+        """
+        context = self.context()
+        if context is None:
+            raise ConfigError(_('the context does not exist anymore'))
+        return context
+
     def _getdefault(self, opt):
         """
         actually retrieves the default value
 
         :param opt: the `option.Option()` object
         """
-        meta = self.context().cfgimpl_get_meta()
+        meta = self._getcontext().cfgimpl_get_meta()
         if meta is not None:
             value = meta.cfgimpl_get_values()[opt]
+            if isinstance(value, Multi):
+                value = list(value)
         else:
             value = opt.impl_getdefault()
         if opt.impl_is_multi():
@@ -60,7 +73,7 @@ class Values(object):
         else:
             return value
 
-    def _getvalue(self, opt, path, validate=True):
+    def _getvalue(self, opt, path):
         """actually retrieves the value
 
         :param opt: the `option.Option()` object
@@ -69,14 +82,9 @@ class Values(object):
         if not self._p_.hasvalue(path):
             # if there is no value
             value = self._getdefault(opt)
-            if opt.impl_is_multi():
-                value = Multi(value, self.context, opt, path, validate)
         else:
             # if there is a value
             value = self._p_.getvalue(path)
-            if opt.impl_is_multi() and not isinstance(value, Multi):
-                # load value so don't need to validate if is not a Multi
-                value = Multi(value, self.context, opt, path, validate=False)
         return value
 
     def get_modified_values(self):
@@ -103,11 +111,11 @@ class Values(object):
         if path is None:
             path = self._get_opt_path(opt)
         if self._p_.hasvalue(path):
-            setting = self.context().cfgimpl_get_settings()
+            context = self._getcontext()
+            setting = context.cfgimpl_get_settings()
             opt.impl_validate(opt.impl_getdefault(),
-                              self.context(),
-                              'validator' in setting)
-            self.context().cfgimpl_reset_cache()
+                              context, 'validator' in setting)
+            context.cfgimpl_reset_cache()
             if (opt.impl_is_multi() and
                     opt.impl_get_multitype() == multitypes.master):
                 for slave in opt.impl_get_master_slaves():
@@ -135,7 +143,7 @@ class Values(object):
         callback, callback_params = opt._callback
         if callback_params is None:
             callback_params = {}
-        return carry_out_calculation(opt._name, config=self.context(),
+        return carry_out_calculation(opt, config=self._getcontext(),
                                      callback=callback,
                                      callback_params=callback_params,
                                      index=index, max_len=max_len)
@@ -149,7 +157,7 @@ class Values(object):
         if path is None:
             path = self._get_opt_path(opt)
         ntime = None
-        setting = self.context().cfgimpl_get_settings()
+        setting = self._getcontext().cfgimpl_get_settings()
         if 'cache' in setting and self._p_.hascache(path):
             if 'expire' in setting:
                 ntime = int(time())
@@ -174,7 +182,8 @@ class Values(object):
     def _getitem(self, opt, path, validate, force_permissive, force_properties,
                  validate_properties):
         # options with callbacks
-        setting = self.context().cfgimpl_get_settings()
+        context = self._getcontext()
+        setting = context.cfgimpl_get_settings()
         is_frozen = 'frozen' in setting[opt]
         # For calculating properties, we need value (ie for mandatory value).
         # If value is calculating with a PropertiesOptionError's option
@@ -184,7 +193,7 @@ class Values(object):
         # ConfigError if properties did not raise.
         config_error = None
         force_permissives = None
-        # if value is callback and is not set
+        # if value has callback and is not set
         # or frozen with force_default_on_freeze
         if opt.impl_has_callback() and (
                 self._is_default_owner(path) or
@@ -194,7 +203,7 @@ class Values(object):
             if (opt.impl_is_multi() and
                     opt.impl_get_multitype() == multitypes.slave):
                 masterp = self._get_opt_path(opt.impl_get_master_slaves())
-                mastervalue = getattr(self.context(), masterp)
+                mastervalue = context._getattr(masterp, validate=validate)
                 lenmaster = len(mastervalue)
                 if lenmaster == 0:
                     value = []
@@ -226,9 +235,12 @@ class Values(object):
             if opt.impl_is_multi():
                 value = Multi(value, self.context, opt, path, validate)
         else:
-            value = self._getvalue(opt, path, validate)
+            value = self._getvalue(opt, path)
+            if opt.impl_is_multi():
+                # load value so don't need to validate if is not a Multi
+                value = Multi(value, self.context, opt, path, validate=validate)
         if config_error is None and validate:
-            opt.impl_validate(value, self.context(), 'validator' in setting)
+            opt.impl_validate(value, context, 'validator' in setting)
         if config_error is None and self._is_default_owner(path) and \
                 'force_store_value' in setting[opt]:
             self.setitem(opt, value, path, is_write=False)
@@ -249,24 +261,45 @@ class Values(object):
         # is_write is, for example, used with "force_store_value"
         # user didn't change value, so not write
         # valid opt
-        opt.impl_validate(value, self.context(),
-                          'validator' in self.context().cfgimpl_get_settings())
-        if opt.impl_is_multi() and not isinstance(value, Multi):
+        context = self._getcontext()
+        opt.impl_validate(value, context,
+                          'validator' in context.cfgimpl_get_settings())
+        if opt.impl_is_multi():
             value = Multi(value, self.context, opt, path, setitem=True)
+            # Save old value
+            if opt.impl_get_multitype() == multitypes.master and \
+                    self._p_.hasvalue(path):
+                old_value = self._p_.getvalue(path)
+                old_owner = self._p_.getowner(path, None)
+            else:
+                old_value = undefined
+                old_owner = undefined
         self._setvalue(opt, path, value, force_permissive=force_permissive,
                        is_write=is_write)
+        if opt.impl_is_multi() and opt.impl_get_multitype() == multitypes.master:
+            try:
+                value._valid_master()
+            except Exception, err:
+                if old_value is not undefined:
+                    self._p_.setvalue(path, old_value, old_owner)
+                else:
+                    self._p_.resetvalue(path)
+                raise err
 
     def _setvalue(self, opt, path, value, force_permissive=False,
                   force_properties=None,
                   is_write=True, validate_properties=True):
-        self.context().cfgimpl_reset_cache()
+        context = self._getcontext()
+        context.cfgimpl_reset_cache()
         if validate_properties:
-            setting = self.context().cfgimpl_get_settings()
+            setting = context.cfgimpl_get_settings()
             setting.validate_properties(opt, False, is_write,
                                         value=value, path=path,
                                         force_permissive=force_permissive,
                                         force_properties=force_properties)
-        owner = self.context().cfgimpl_get_settings().getowner()
+        owner = context.cfgimpl_get_settings().getowner()
+        if isinstance(value, Multi):
+            value = list(value)
         self._p_.setvalue(path, value, owner)
 
     def getowner(self, opt):
@@ -283,7 +316,7 @@ class Values(object):
 
     def _getowner(self, path):
         owner = self._p_.getowner(path, owners.default)
-        meta = self.context().cfgimpl_get_meta()
+        meta = self._getcontext().cfgimpl_get_meta()
         if owner is owners.default and meta is not None:
             owner = meta.cfgimpl_get_values()._getowner(path)
         return owner
@@ -335,7 +368,7 @@ class Values(object):
         :param opt: the `option.Option` object
         :returns: a string with points like "gc.dummy.my_option"
         """
-        return self.context().cfgimpl_get_description().impl_get_path_by_opt(opt)
+        return self._getcontext().cfgimpl_get_description().impl_get_path_by_opt(opt)
 
     # information
     def set_information(self, key, value):
@@ -360,6 +393,42 @@ class Values(object):
                 raise ValueError(_("information's item"
                                    " not found: {0}").format(key))
 
+    def mandatory_warnings(self):
+        """convenience function to trace Options that are mandatory and
+        where no value has been set
+
+        :returns: generator of mandatory Option's path
+
+        """
+        #if value in cache, properties are not calculated
+        self.reset_cache(False)
+        context = self.context()
+        for path in context.cfgimpl_get_description().impl_getpaths(
+                include_groups=True):
+            try:
+                context._getattr(path,
+                                 force_properties=frozenset(('mandatory',)))
+            except PropertiesOptionError as err:
+                if err.proptype == ['mandatory']:
+                    yield path
+        self.reset_cache(False)
+
+    def force_cache(self):
+        """parse all option to force data in cache
+        """
+        context = self.context()
+        if not 'cache' in context.cfgimpl_get_settings():
+            raise ConfigError(_('can force cache only if cache '
+                                'is actived in config'))
+        #remove all cached properties and value to update "expired" time
+        context.cfgimpl_reset_cache()
+        for path in context.cfgimpl_get_description().impl_getpaths(
+                include_groups=True):
+            try:
+                context._getattr(path)
+            except PropertiesOptionError:
+                pass
+
     def __getstate__(self):
         return {'_p_': self._p_}
 
@@ -387,6 +456,8 @@ class Multi(list):
         :param opt: the option object that have this Multi value
         :param setitem: only if set a value
         """
+        if isinstance(value, Multi):
+            raise ValueError(_('{0} is already a Multi ').format(opt._name))
         self.opt = opt
         self.path = path
         if not isinstance(context, weakref.ReferenceType):
@@ -396,21 +467,32 @@ class Multi(list):
             value = [value]
         if validate and self.opt.impl_get_multitype() == multitypes.slave:
             value = self._valid_slave(value, setitem)
-        elif validate and self.opt.impl_get_multitype() == multitypes.master:
-            self._valid_master(value)
+        elif not setitem and validate and \
+                self.opt.impl_get_multitype() == multitypes.master:
+            self._valid_master()
         super(Multi, self).__init__(value)
 
+    def _getcontext(self):
+        """context could be None, we need to test it
+        context is None only if all reference to `Config` object is deleted
+        (for example we delete a `Config` and we manipulate a reference to
+        old `SubConfig`, `Values`, `Multi` or `Settings`)
+        """
+        context = self.context()
+        if context is None:
+            raise ConfigError(_('the context does not exist anymore'))
+        return context
+
     def _valid_slave(self, value, setitem):
         #if slave, had values until master's one
-        values = self.context().cfgimpl_get_values()
-        masterp = self.context().cfgimpl_get_description().impl_get_path_by_opt(
+        context = self._getcontext()
+        values = context.cfgimpl_get_values()
+        masterp = context.cfgimpl_get_description().impl_get_path_by_opt(
             self.opt.impl_get_master_slaves())
-        mastervalue = getattr(self.context(), masterp)
+        mastervalue = context._getattr(masterp, validate=False)
         masterlen = len(mastervalue)
         valuelen = len(value)
-        is_default_owner = not values._is_default_owner(self.path) or setitem
-        if valuelen > masterlen or (valuelen < masterlen and
-                                    is_default_owner):
+        if valuelen > masterlen or (valuelen < masterlen and setitem):
             raise SlaveError(_("invalid len for the slave: {0}"
                                " which has {1} as master").format(
                                    self.opt._name, masterp))
@@ -427,59 +509,43 @@ class Multi(list):
         #else: same len so do nothing
         return value
 
-    def _valid_master(self, value):
-        masterlen = len(value)
-        values = self.context().cfgimpl_get_values()
+    def _valid_master(self):
+        #masterlen = len(value)
+        values = self._getcontext().cfgimpl_get_values()
         for slave in self.opt._master_slaves:
             path = values._get_opt_path(slave)
-            if not values._is_default_owner(path):
-                value_slave = values._getvalue(slave, path)
-                if len(value_slave) > masterlen:
-                    raise SlaveError(_("invalid len for the master: {0}"
-                                       " which has {1} as slave with"
-                                       " greater len").format(
-                                           self.opt._name, slave._name))
-                elif len(value_slave) < masterlen:
-                    for num in range(0, masterlen - len(value_slave)):
-                        if slave.impl_has_callback():
-                            # if callback add a value, but this value will not
-                            # change anymore automaticly (because this value
-                            # has owner)
-                            index = value_slave.__len__()
-                            value_slave.append(
-                                values._getcallback_value(slave, index=index),
-                                force=True)
-                        else:
-                            value_slave.append(slave.impl_getdefault_multi(),
-                                               force=True)
+            Multi(values._getvalue(slave, path), self.context, slave, path)
 
     def __setitem__(self, index, value):
         self._validate(value, index)
         #assume not checking mandatory property
         super(Multi, self).__setitem__(index, value)
-        self.context().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
+        self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
 
-    def append(self, value, force=False):
+    def append(self, value=undefined, force=False):
         """the list value can be updated (appened)
         only if the option is a master
         """
+        context = self._getcontext()
         if not force:
             if self.opt.impl_get_multitype() == multitypes.slave:
                 raise SlaveError(_("cannot append a value on a multi option {0}"
                                    " which is a slave").format(self.opt._name))
             elif self.opt.impl_get_multitype() == multitypes.master:
-                values = self.context().cfgimpl_get_values()
-                if value is None and self.opt.impl_has_callback():
+                values = context.cfgimpl_get_values()
+                if value is undefined and self.opt.impl_has_callback():
                     value = values._getcallback_value(self.opt)
                     #Force None il return a list
                     if isinstance(value, list):
                         value = None
         index = self.__len__()
+        if value is undefined:
+            value = self.opt.impl_getdefault_multi()
         self._validate(value, index)
         super(Multi, self).append(value)
-        self.context().cfgimpl_get_values()._setvalue(self.opt, self.path,
-                                                      self,
-                                                      validate_properties=not force)
+        context.cfgimpl_get_values()._setvalue(self.opt, self.path,
+                                               self,
+                                               validate_properties=not force)
         if not force and self.opt.impl_get_multitype() == multitypes.master:
             for slave in self.opt.impl_get_master_slaves():
                 path = values._get_opt_path(slave)
@@ -488,16 +554,15 @@ class Multi(list):
                         dvalue = values._getcallback_value(slave, index=index)
                     else:
                         dvalue = slave.impl_getdefault_multi()
-                    old_value = values.getitem(slave, path,
+                    old_value = values.getitem(slave, path, validate=False,
                                                validate_properties=False)
-                    if len(old_value) < self.__len__():
-                        values.getitem(slave, path,
-                                       validate_properties=False).append(
-                                           dvalue, force=True)
-                    else:
-                        values.getitem(slave, path,
-                                       validate_properties=False)[
-                                           index] = dvalue
+                    if len(old_value) + 1 != self.__len__():
+                        raise SlaveError(_("invalid len for the slave: {0}"
+                                           " which has {1} as master").format(
+                                               self.opt._name, self.__len__()))
+                    values.getitem(slave, path, validate=False,
+                                   validate_properties=False).append(
+                                       dvalue, force=True)
 
     def sort(self, cmp=None, key=None, reverse=False):
         if self.opt.impl_get_multitype() in [multitypes.slave,
@@ -510,7 +575,7 @@ class Multi(list):
             super(Multi, self).sort(key=key, reverse=reverse)
         else:
             super(Multi, self).sort(cmp=cmp, key=key, reverse=reverse)
-        self.context().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
+        self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
 
     def reverse(self):
         if self.opt.impl_get_multitype() in [multitypes.slave,
@@ -518,7 +583,7 @@ class Multi(list):
             raise SlaveError(_("cannot reverse multi option {0} if master or "
                                "slave").format(self.opt._name))
         super(Multi, self).reverse()
-        self.context().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
+        self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
 
     def insert(self, index, obj):
         if self.opt.impl_get_multitype() in [multitypes.slave,
@@ -526,7 +591,7 @@ class Multi(list):
             raise SlaveError(_("cannot insert multi option {0} if master or "
                                "slave").format(self.opt._name))
         super(Multi, self).insert(index, obj)
-        self.context().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
+        self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
 
     def extend(self, iterable):
         if self.opt.impl_get_multitype() in [multitypes.slave,
@@ -534,12 +599,12 @@ class Multi(list):
             raise SlaveError(_("cannot extend multi option {0} if master or "
                                "slave").format(self.opt._name))
         super(Multi, self).extend(iterable)
-        self.context().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
+        self._getcontext().cfgimpl_get_values()._setvalue(self.opt, self.path, self)
 
     def _validate(self, value, force_index):
         if value is not None:
             try:
-                self.opt.impl_validate(value, context=self.context(),
+                self.opt.impl_validate(value, context=self._getcontext(),
                                        force_index=force_index)
             except ValueError as err:
                 raise ValueError(_("invalid value {0} "
@@ -557,19 +622,20 @@ class Multi(list):
         :type force: boolean
         :returns: item at index
         """
+        context = self._getcontext()
         if not force:
             if self.opt.impl_get_multitype() == multitypes.slave:
                 raise SlaveError(_("cannot pop a value on a multi option {0}"
                                    " which is a slave").format(self.opt._name))
-            elif self.opt.impl_get_multitype() == multitypes.master:
+            if self.opt.impl_get_multitype() == multitypes.master:
                 for slave in self.opt.impl_get_master_slaves():
-                    values = self.context().cfgimpl_get_values()
+                    values = context.cfgimpl_get_values()
                     if not values.is_default_owner(slave):
                         #get multi without valid properties
-                        values.getitem(slave,
+                        values.getitem(slave, validate=False,
                                        validate_properties=False
                                        ).pop(index, force=True)
         #set value without valid properties
         ret = super(Multi, self).pop(index)
-        self.context().cfgimpl_get_values()._setvalue(self.opt, self.path, self, validate_properties=not force)
+        context.cfgimpl_get_values()._setvalue(self.opt, self.path, self, validate_properties=not force)
         return ret
diff --git a/translations/fr/tiramisu.po b/translations/fr/tiramisu.po
index 256a0da..3dee004 100644
--- a/translations/fr/tiramisu.po
+++ b/translations/fr/tiramisu.po
@@ -1,63 +1,61 @@
 msgid ""
 msgstr ""
-"Project-Id-Version: \n"
+"Project-Id-Version: Tiramisu\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2013-09-28 19:06+CEST\n"
+"POT-Creation-Date: 2014-03-12 21:49+CET\n"
 "PO-Revision-Date: \n"
 "Last-Translator: Emmanuel Garette <egarette@cadoles.com>\n"
-"Language-Team: LANGUAGE <LL@li.org>\n"
+"Language-Team: Tiramisu's team <egarette@cadoles.com>\n"
+"Language: fr\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "X-Generator: Poedit 1.5.4\n"
+"Plural-Forms: nplurals=2; plural=(n > 1);\n"
+"X-Poedit-SourceCharset: UTF-8\n"
 
-#: tiramisu/autolib.py:144
+#: tiramisu/autolib.py:162
 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:153
-msgid ""
-"unable to carry out a calculation, option value with multi types must have "
-"same length for: {0}"
-msgstr ""
-"impossible d'effectuer le calcul, la valeur d'une option avec le type multi "
-"doit avoir la même longueur pour : {0}"
-
-#: tiramisu/config.py:51
+#: tiramisu/config.py:52
 msgid "descr must be an optiondescription, not {0}"
 msgstr "descr doit être une optiondescription pas un {0}"
 
-#: tiramisu/config.py:126
+#: tiramisu/config.py:127
 msgid "unknown group_type: {0}"
 msgstr "group_type inconnu: {0}"
 
-#: tiramisu/config.py:162
-msgid ""
-"no option description found for this config (may be metaconfig without meta)"
-msgstr ""
-"pas d'option description trouvé pour cette config (peut être une metaconfig "
-"sans meta)"
+#: tiramisu/config.py:164 tiramisu/setting.py:339 tiramisu/value.py:57
+#: tiramisu/value.py:485
+msgid "the context does not exist anymore"
+msgstr "le context n'existe plus"
 
-#: tiramisu/config.py:188
+#: tiramisu/config.py:169
+msgid "no option description found for this config (may be GroupConfig)"
+msgstr ""
+"pas d'option description trouvé pour cette config (peut être un GroupConfig)"
+
+#: tiramisu/config.py:195
 msgid "can't assign to an OptionDescription"
 msgstr "ne peut pas attribuer une valeur à une OptionDescription"
 
-#: tiramisu/config.py:319
+#: tiramisu/config.py:325
 msgid "unknown type_ type {0}for _find"
 msgstr "type_ type {0} pour _find inconnu"
 
-#: tiramisu/config.py:358
+#: tiramisu/config.py:364
 msgid "no option found in config with these criteria"
 msgstr "aucune option trouvée dans la config avec ces critères"
 
-#: tiramisu/config.py:408
+#: tiramisu/config.py:414
 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:429
+#: tiramisu/config.py:435
 msgid "unexpected path {0}, should start with {1}"
 msgstr "chemin imprévu {0}, devrait commencer par {1}"
 
@@ -65,41 +63,66 @@ msgstr "chemin imprévu {0}, devrait commencer par {1}"
 msgid "opt in getowner must be an option not {0}"
 msgstr "opt dans getowner doit être une option pas {0}"
 
-#: tiramisu/option.py:68
+#: tiramisu/config.py:532
+msgid "cannot serialize Config with MetaConfig"
+msgstr "impossible de sérialiser une Config avec une MetaConfig"
+
+#: tiramisu/config.py:546
+msgid "this storage is not serialisable, could be a none persistent storage"
+msgstr "ce storage n'est sérialisable, devrait être une storage non persistant"
+
+#: tiramisu/config.py:609
+msgid "metaconfig's children must be a list"
+msgstr "enfants d'une metaconfig doit être une liste"
+
+#: tiramisu/config.py:703
+msgid "metaconfig's children should be config, not {0}"
+msgstr "enfants d'une metaconfig doit être une config, pas {0}"
+
+#: tiramisu/config.py:707
+msgid "child has already a metaconfig's"
+msgstr "enfant a déjà une metaconfig"
+
+#: tiramisu/config.py:711
+msgid "all config in metaconfig must have the same optiondescription"
+msgstr ""
+"toutes les configs d'une metaconfig doivent avoir la même optiondescription"
+
+#: tiramisu/option.py:67
 msgid "invalid name: {0} for option"
 msgstr "nom invalide : {0} pour l'option"
 
-#: tiramisu/option.py:77
+#: tiramisu/option.py:76
 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:115
+#: tiramisu/option.py:114
 msgid "'{0}' ({1}) object attribute '{2}' is read-only"
 msgstr "l'attribut {2} de l'objet '{0}' ({1}) est en lecture seule"
 
-#: tiramisu/option.py:142 tiramisu/value.py:360
+#: tiramisu/option.py:141 tiramisu/value.py:395
 msgid "information's item not found: {0}"
-msgstr "aucune config spécifié alors que c'est nécessaire"
+msgstr "aucune config spécifiée alors que c'est nécessaire"
 
-#: tiramisu/option.py:204
+#: tiramisu/option.py:203
 msgid "cannot serialize Option, only in OptionDescription"
 msgstr "ne peut serialiser une Option, seulement via une OptionDescription"
 
-#: tiramisu/option.py:307
+#: tiramisu/option.py:306
 msgid "a default_multi is set whereas multi is False in option: {0}"
 msgstr ""
 "une default_multi est renseignée alors que multi est False dans l'option : "
 "{0}"
 
-#: tiramisu/option.py:313
+#: tiramisu/option.py:312
 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:318
+#: tiramisu/option.py:317
 msgid "default value not allowed if option: {0} is calculated"
 msgstr "la valeur par défaut n'est pas possible si l'option {0} est calculée"
 
-#: tiramisu/option.py:321
+#: tiramisu/option.py:320
 msgid ""
 "params defined for a callback function but no callback defined yet for "
 "option {0}"
@@ -107,221 +130,289 @@ msgstr ""
 "params définis pour une fonction callback mais par de callback encore "
 "définis pour l'option {0}"
 
-#: tiramisu/option.py:360
-msgid "option not in all_cons_opts"
-msgstr "option non présentante dans all_cons_opts"
+#: tiramisu/option.py:425 tiramisu/option.py:450
+msgid "invalid value for option {0}: {1}"
+msgstr "valeur invalide pour l'option {0} : {1}"
 
-#: tiramisu/option.py:432 tiramisu/value.py:545
-msgid "invalid value {0} for option {1}: {2}"
-msgstr "valeur invalide {0} pour l'option {1} : {2}"
+#: tiramisu/option.py:444
+msgid "warning on the value of the option {0}: {1}"
+msgstr "avertissement sur la valeur de l'option {0} : {1}"
 
-#: tiramisu/option.py:449
-msgid "which must be a list"
-msgstr "lequel doit être une liste"
+#: tiramisu/option.py:461
+msgid "invalid value {0} for option {1} which must be a list"
+msgstr "valeur invalide pour l'option {0} : {1} laquelle doit être une liste"
 
-#: tiramisu/option.py:509
-msgid "consistency should be set with an option"
+#: tiramisu/option.py:519
+msgid "consistency must be set with an option"
 msgstr "consistency doit être configuré avec une option"
 
-#: tiramisu/option.py:511
+#: tiramisu/option.py:521
 msgid "cannot add consistency with itself"
 msgstr "ne peut ajouter une consistency avec lui même"
 
-#: tiramisu/option.py:513
-msgid "every options in consistency should be multi or none"
+#: tiramisu/option.py:523
+msgid "every options in consistency must be multi or none"
 msgstr ""
-"toutes les options d'une consistency devrait être multi ou ne pas l'être"
+"toutes les options d'une consistency doivent être multi ou ne pas l'être"
 
-#: tiramisu/option.py:533
-msgid "same value for {0} and {1}"
-msgstr "même valeur pour {0} et {1}"
+#: tiramisu/option.py:544
+msgid "same value for {0} and {1}, should be different"
+msgstr "même valeur pour {0} et {1}, devrait être différent"
 
-#: tiramisu/option.py:642
+#: tiramisu/option.py:546
+msgid "same value for {0} and {1}, must be different"
+msgstr "même valeur pour {0} et {1}, doit être différent"
+
+#: tiramisu/option.py:640
 msgid "values must be a tuple for {0}"
 msgstr "values doit être un tuple pour {0}"
 
-#: tiramisu/option.py:645
+#: tiramisu/option.py:643
 msgid "open_values must be a boolean for {0}"
 msgstr "open_values doit être un booléen pour {0}"
 
-#: tiramisu/option.py:667
+#: tiramisu/option.py:665
 msgid "value {0} is not permitted, only {1} is allowed"
 msgstr "valeur {0} n'est pas permis, seules {1} sont autorisées"
 
-#: tiramisu/option.py:679
-msgid "value must be a boolean"
-msgstr "valeur doit être un booléen"
+#: tiramisu/option.py:677
+msgid "invalid boolean"
+msgstr "booléen invalide"
 
-#: tiramisu/option.py:689
-msgid "value must be an integer"
-msgstr "valeur doit être un nombre entier"
+#: tiramisu/option.py:687
+msgid "invalid integer"
+msgstr "nombre invalide"
 
-#: tiramisu/option.py:699
-msgid "value must be a float"
-msgstr "valeur doit être un nombre flottant"
+#: tiramisu/option.py:697
+msgid "invalid float"
+msgstr "invalide nombre flottan"
 
-#: tiramisu/option.py:709
-msgid "value must be a string, not {0}"
-msgstr "valeur doit être une chaîne, pas {0}"
+#: tiramisu/option.py:707
+msgid "invalid string"
+msgstr "invalide caractère"
 
-#: tiramisu/option.py:727
-msgid "value must be an unicode"
-msgstr "valeur doit être une valeur unicode"
+#: tiramisu/option.py:724
+msgid "invalid unicode"
+msgstr "invalide unicode"
 
-#: tiramisu/option.py:739
+#: tiramisu/option.py:736
 msgid "malformed symlinkoption must be an option for symlink {0}"
 msgstr "symlinkoption mal formé, doit être une option pour symlink {0}"
 
-#: tiramisu/option.py:788
-msgid "invalid IP {0}"
-msgstr "adresse IP invalide {0}"
+#: tiramisu/option.py:787 tiramisu/option.py:790 tiramisu/option.py:795
+msgid "invalid IP"
+msgstr "adresse IP invalide"
 
-#: tiramisu/option.py:793
-msgid "IP mustn't not be in reserved class"
-msgstr "IP ne doit pas être d'une classe reservée"
+#: tiramisu/option.py:801
+msgid "IP shouldn't be in reserved class"
+msgstr "l'adresse IP ne devrait pas être d'une classe réservée"
 
-#: tiramisu/option.py:795
-msgid "IP must be in private class"
-msgstr "IP doit être dans la classe privée"
+#: tiramisu/option.py:803
+msgid "invalid IP, mustn't be in reserved class"
+msgstr "adresse IP invalide, ne doit pas être dans une classe réservée"
 
-#: tiramisu/option.py:833
-msgid "inconsistency in allowed range"
-msgstr "inconsistence dans la plage autorisée"
+#: tiramisu/option.py:807
+msgid "IP should be in private class"
+msgstr "l'adresse IP devrait être dans une classe privée"
 
-#: tiramisu/option.py:838
-msgid "max value is empty"
-msgstr "la valeur maximum est vide"
+#: tiramisu/option.py:809
+msgid "invalid IP, must be in private class"
+msgstr "adresse IP invalide, doit être dans la classe privée"
 
-#: tiramisu/option.py:877
-msgid "invalid network address {0}"
-msgstr "adresse réseau invalide {0}"
-
-#: tiramisu/option.py:882
-msgid "network shall not be in reserved class"
-msgstr "le réseau ne doit pas être dans la classe reservée"
-
-#: tiramisu/option.py:894
-msgid "invalid netmask address {0}"
-msgstr "masque de sous-réseau invalide {0}"
-
-#: tiramisu/option.py:910
-msgid "invalid len for opts"
-msgstr "longueur invalide pour opts"
-
-#: tiramisu/option.py:922
-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:927
-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:932
-msgid "invalid IP {0} ({1}) with netmask {2} ({3})"
-msgstr "IP invalide {0} ({1}) avec masque {2} ({3})"
-
-#: tiramisu/option.py:934
-msgid "invalid network {0} ({1}) with netmask {2} ({3})"
-msgstr "réseau invalide {0} ({1}) avec masque {2} ({3})"
-
-#: tiramisu/option.py:948
-msgid "invalid broadcast address {0}"
-msgstr "adresse de broadcast invalide {0}"
-
-#: tiramisu/option.py:952
+#: tiramisu/option.py:814 tiramisu/option.py:989
 msgid "invalid len for vals"
 msgstr "longueur invalide pour vals"
 
-#: tiramisu/option.py:957
+#: tiramisu/option.py:820
+msgid "IP {0} ({1}) not in network {2} ({3}) with netmask {4} ({5})"
+msgstr "IP {0} ({1}) pas dans le réseau {2} ({3}) avec le masque {4} ({5})"
+
+#: tiramisu/option.py:823
+msgid "invalid IP {0} ({1}) not in network {2} ({3}) with netmask {4} ({5})"
+msgstr ""
+"IP invalide {0} ({1}) pas dans le réseau {2} ({3}) avec le masque {4} ({5})"
+
+#: tiramisu/option.py:864
+msgid "inconsistency in allowed range"
+msgstr "inconsistence dans la plage autorisée"
+
+#: tiramisu/option.py:869
+msgid "max value is empty"
+msgstr "la valeur maximum est vide"
+
+#: tiramisu/option.py:886
+msgid "invalid port, range must have two values only"
+msgstr "port invalide, une plage doit avoir deux valeurs seulement"
+
+#: tiramisu/option.py:889
+msgid "invalid port, first port in range must be smaller than the second one"
+msgstr ""
+"port invalide, le premier port d'une plage doit être plus petit que le second"
+
+#: tiramisu/option.py:898
+msgid "invalid port"
+msgstr "port invalide"
+
+#: tiramisu/option.py:900
+msgid "invalid port, must be an between {0} and {1}"
+msgstr "port invalide, port doit être entre {0} et {1}"
+
+#: tiramisu/option.py:914
+msgid "invalid network address"
+msgstr "adresse réseau invalide"
+
+#: tiramisu/option.py:920
+msgid "network address shouldn't be in reserved class"
+msgstr "l'adresse réseau ne devait pas être dans la classe réservée"
+
+#: tiramisu/option.py:922
+msgid "invalid network address, mustn't be in reserved class"
+msgstr "adresse réseau invalide, ne doit pas être dans la classe réservée"
+
+#: tiramisu/option.py:935
+msgid "invalid netmask address"
+msgstr "masque de sous-réseau invalide"
+
+#: tiramisu/option.py:952
+msgid "invalid len for opts"
+msgstr "longueur invalide pour opts"
+
+#: tiramisu/option.py:966
+msgid "invalid IP {0} ({1}) with netmask {2}, this IP is a network"
+msgstr "IP invalide {0} ({1}) avec masque {2}, cette IP est un réseau"
+
+#: tiramisu/option.py:971
+msgid "invalid network {0} ({1}) with netmask {2}"
+msgstr "réseau invalide {0} ({1}) avec masque {2}"
+
+#: tiramisu/option.py:985
+msgid "invalid broadcast address"
+msgstr "adresse de broadcast invalide"
+
+#: tiramisu/option.py:994
 msgid ""
 "invalid broadcast {0} ({1}) with network {2} ({3}) and netmask {4} ({5})"
 msgstr ""
 "Broadcast invalide {0} ({1}) avec le réseau {2} ({3}) et le masque {4} ({5})"
 
-#: tiramisu/option.py:979
+#: tiramisu/option.py:1016
 msgid "unknown type_ {0} for hostname"
 msgstr "type_ inconnu {0} pour le nom d'hôte"
 
-#: tiramisu/option.py:982
+#: tiramisu/option.py:1019
 msgid "allow_ip must be a boolean"
 msgstr "allow_ip doit être un booléen"
 
-#: tiramisu/option.py:1012
-msgid "invalid value for {0}, must have dot"
-msgstr "valeur invalide pour {0}, doit avoir un point"
+#: tiramisu/option.py:1021
+msgid "allow_without_dot must be a boolean"
+msgstr "allow_without_dot doit être un booléen"
 
-#: tiramisu/option.py:1015
-msgid "invalid domainname's length for {0} (max {1})"
-msgstr "longueur du nom de domaine invalide pour {0} (maximum {1})"
+#: tiramisu/option.py:1065
+msgid "invalid domainname, must have dot"
+msgstr "nom de domaine invalide, doit avoir un point"
 
-#: tiramisu/option.py:1018
-msgid "invalid domainname's length for {0} (min 2)"
-msgstr "longueur du nom de domaine invalide pour {0} (minimum 2)"
+#: tiramisu/option.py:1067
+msgid "invalid domainname's length (max 255)"
+msgstr "longueur du nom de domaine invalide (maximum {1})"
 
-#: tiramisu/option.py:1022
+#: tiramisu/option.py:1069
+msgid "invalid domainname's length (min 2)"
+msgstr "longueur du nom de domaine invalide (minimum 2)"
+
+#: tiramisu/option.py:1071
 msgid "invalid domainname"
 msgstr "nom de domaine invalide"
 
-#: tiramisu/option.py:1049
+#: tiramisu/option.py:1084
+msgid "invalid email address, must contains one @"
+msgstr "adresse email invalide, doit contenir un @"
+
+#: tiramisu/option.py:1087
+msgid "invalid username in email address"
+msgstr "nom d'utilisateur invalide dans une adresse email"
+
+#: tiramisu/option.py:1100
+msgid "invalid url, must start with http:// or https://"
+msgstr "URL invalide, doit démarrer avec http:// ou https://"
+
+#: tiramisu/option.py:1119
+msgid "invalid url, port must be an between 0 and 65536"
+msgstr "URL invalide, port doit être entre 0 et 65536"
+
+#: tiramisu/option.py:1125
+msgid "invalid url, must ends with filename"
+msgstr "URL invalide, doit finir avec un nom de fichier"
+
+#: tiramisu/option.py:1137
+msgid "invalid username"
+msgstr "utilisateur invalide"
+
+#: tiramisu/option.py:1148
+msgid "invalid filename"
+msgstr "nom de fichier invalide"
+
+#: tiramisu/option.py:1175
 msgid "duplicate option name: {0}"
 msgstr "nom de l'option dupliqué : {0}"
 
-#: tiramisu/option.py:1067
+#: tiramisu/option.py:1193
 msgid "unknown Option {0} in OptionDescription {1}"
 msgstr "Option {0} inconnue pour l'OptionDescription {1}"
 
-#: tiramisu/option.py:1118
+#: tiramisu/option.py:1244
 msgid "duplicate option: {0}"
 msgstr "option dupliquée : {0}"
 
-#: tiramisu/option.py:1148
+#: tiramisu/option.py:1275
 msgid "consistency with option {0} which is not in Config"
 msgstr "consistency avec l'option {0} qui n'est pas dans une Config"
 
-#: tiramisu/option.py:1156
+#: tiramisu/option.py:1283
 msgid "no option for path {0}"
 msgstr "pas d'option pour le chemin {0}"
 
-#: tiramisu/option.py:1162
+#: tiramisu/option.py:1289
 msgid "no option {0} found"
 msgstr "pas d'option {0} trouvée"
 
-#: tiramisu/option.py:1172
+#: tiramisu/option.py:1299
 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:1185
+#: tiramisu/option.py:1311
 msgid "master group {0} shall not have a subgroup"
 msgstr "groupe maître {0} ne doit pas avoir de sous-groupe"
 
-#: tiramisu/option.py:1188
+#: tiramisu/option.py:1314
 msgid "master group {0} shall not have a symlinkoption"
 msgstr "groupe maître {0} ne doit pas avoir de symlinkoption"
 
-#: tiramisu/option.py:1191
+#: tiramisu/option.py:1317
 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:1202
+#: tiramisu/option.py:1327
 msgid "master group with wrong master name for {0}"
 msgstr "le groupe maître avec un nom de maître érroné pour {0}"
 
-#: tiramisu/option.py:1211
-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:1335
+msgid "callback of master's option shall not refered a slave's ones"
+msgstr ""
+"callback d'une variable maitre ne devrait pas référencer des variables "
+"esclaves"
 
-#: tiramisu/option.py:1214
+#: tiramisu/option.py:1343
 msgid "group_type: {0} not allowed"
 msgstr "group_type : {0} non autorisé"
 
-#: tiramisu/option.py:1306
+#: tiramisu/option.py:1443
 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:1323
+#: tiramisu/option.py:1460
 msgid ""
 "malformed requirements for option: {0} require must have option, expected "
 "and action keys"
@@ -329,110 +420,110 @@ msgstr ""
 "requirements malformé pour l'option : {0} l'exigence doit avoir les clefs "
 "option, expected et action"
 
-#: tiramisu/option.py:1328
+#: tiramisu/option.py:1465
 msgid "malformed requirements for option: {0} inverse must be boolean"
 msgstr ""
 "requirements mal formés pour l'option : {0} inverse doit être un booléen"
 
-#: tiramisu/option.py:1332
+#: tiramisu/option.py:1469
 msgid "malformed requirements for option: {0} transitive must be boolean"
 msgstr ""
 "requirements mal formés pour l'option : {0} transitive doit être booléen"
 
-#: tiramisu/option.py:1336
+#: tiramisu/option.py:1473
 msgid "malformed requirements for option: {0} same_action must be boolean"
 msgstr ""
 "requirements mal formés pour l'option : {0} same_action doit être un booléen"
 
-#: tiramisu/option.py:1340
+#: tiramisu/option.py:1477
 msgid "malformed requirements must be an option in option {0}"
 msgstr "requirements mal formés doit être une option dans l'option {0}"
 
-#: tiramisu/option.py:1343
-msgid "malformed requirements option {0} should not be a multi"
+#: tiramisu/option.py:1480
+msgid "malformed requirements option {0} must not be a multi"
 msgstr "requirements mal formés l'option {0} ne doit pas être une multi"
 
-#: tiramisu/option.py:1349
+#: tiramisu/option.py:1486
 msgid ""
 "malformed requirements second argument must be valid for option {0}: {1}"
 msgstr ""
 "requirements mal formés deuxième argument doit être valide pour l'option "
 "{0} : {1}"
 
-#: tiramisu/option.py:1354
+#: tiramisu/option.py:1491
 msgid "inconsistency in action types for option: {0} action: {1}"
 msgstr "incohérence dans les types action pour l'option : {0} action {1}"
 
-#: tiramisu/option.py:1379
-msgid "{0} should be a function"
+#: tiramisu/option.py:1516
+msgid "{0} must be a function"
 msgstr "{0} doit être une fonction"
 
-#: tiramisu/option.py:1382
-msgid "{0}_params should be a dict"
-msgstr "{0}_params devrait être un dict"
+#: tiramisu/option.py:1519
+msgid "{0}_params must be a dict"
+msgstr "{0}_params doit être un dict"
 
-#: tiramisu/option.py:1385
-msgid "{0}_params with key {1} should not have length different to 1"
+#: tiramisu/option.py:1522
+msgid "{0}_params with key {1} mustn't have length different to 1"
 msgstr ""
-"{0}_params avec la clef {1} devrait ne pas avoir une longueur différent de 1"
+"{0}_params avec la clef {1} ne doit pas avoir une longueur différent de 1"
 
-#: tiramisu/option.py:1389
-msgid "{0}_params should be tuple for key \"{1}\""
-msgstr "{0}_params devrait être un tuple pour la clef \"{1}\""
+#: tiramisu/option.py:1526
+msgid "{0}_params must be tuple for key \"{1}\""
+msgstr "{0}_params doit être un tuple pour la clef \"{1}\""
 
-#: tiramisu/option.py:1395
+#: tiramisu/option.py:1532
 msgid "validator not support tuple"
 msgstr "validator n'accepte pas de tuple"
 
-#: tiramisu/option.py:1398
-msgid "{0}_params should have an option not a {0} for first argument"
-msgstr "{0}_params devrait avoir une option pas un {0} pour premier argument"
+#: tiramisu/option.py:1535
+msgid "{0}_params must have an option not a {0} for first argument"
+msgstr "{0}_params doit avoir une option pas un {0} pour premier argument"
 
-#: tiramisu/option.py:1402
-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/option.py:1539
+msgid "{0}_params must have a boolean not a {0} for second argument"
+msgstr "{0}_params doit avoir un booléen pas un {0} pour second argument"
 
-#: tiramisu/setting.py:111
+#: tiramisu/setting.py:116
 msgid "can't rebind {0}"
 msgstr "ne peut redéfinir ({0})"
 
-#: tiramisu/setting.py:116
+#: tiramisu/setting.py:121
 msgid "can't unbind {0}"
 msgstr "ne peut supprimer ({0})"
 
-#: tiramisu/setting.py:254
+#: tiramisu/setting.py:272
 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:317
+#: tiramisu/setting.py:363
 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:332
+#: tiramisu/setting.py:378
 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:435
+#: tiramisu/setting.py:487
 msgid "cannot change the value for option {0} this option is frozen"
 msgstr ""
 "ne peut modifier la valeur de l'option {0} cette option n'est pas modifiable"
 
-#: tiramisu/setting.py:441
+#: tiramisu/setting.py:493
 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:459
+#: tiramisu/setting.py:511
 msgid "permissive must be a tuple"
 msgstr "permissive doit être un tuple"
 
-#: tiramisu/setting.py:466 tiramisu/value.py:299
+#: tiramisu/setting.py:518 tiramisu/value.py:334
 msgid "invalid generic owner {0}"
 msgstr "invalide owner générique {0}"
 
-#: tiramisu/setting.py:553
+#: tiramisu/setting.py:606
 msgid ""
 "malformed requirements imbrication detected for option: '{0}' with "
 "requirement on: '{1}'"
@@ -440,75 +531,119 @@ msgstr ""
 "imbrication de requirements mal formés detectée pour l'option : '{0}' avec "
 "requirement sur : '{1}'"
 
-#: tiramisu/setting.py:565
+#: tiramisu/setting.py:617
 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/__init__.py:47
+#: 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:81
+#: 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:37
+#: 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:48
+#: tiramisu/storage/dictionary/storage.py:50
 msgid "session already used"
 msgstr "session déjà utilisée"
 
-#: tiramisu/storage/dictionary/storage.py:50
+#: 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:306
+#: tiramisu/value.py:341
 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:414
+#: tiramisu/value.py:423
+msgid "can force cache only if cache is actived in config"
+msgstr ""
+"peut force la mise en cache seulement si le cache est activé dans la config"
+
+#: tiramisu/value.py:462
+msgid "{0} is already a Multi "
+msgstr "{0} est déjà une Multi"
+
+#: tiramisu/value.py:498 tiramisu/value.py:562
 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: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:468
+#: tiramisu/value.py:534
 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:505
+#: tiramisu/value.py:572
 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:509
+#: tiramisu/value.py:576
 msgid "cmp is not permitted in python v3 or greater"
 msgstr "cmp n'est pas permis en python v3 ou supérieure"
 
-#: tiramisu/value.py:518
+#: tiramisu/value.py:585
 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:526
+#: tiramisu/value.py:593
 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:534
+#: tiramisu/value.py:601
 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:562
+#: tiramisu/value.py:612
+msgid "invalid value {0} for option {1}: {2}"
+msgstr "valeur invalide {0} pour l'option {1} : {2}"
+
+#: tiramisu/value.py:630
 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 "invalid value {0} for option {1} which must be a list"
-#~ msgstr "valeur invalide {0} pour l'option {1} qui doit être une liste"
+#~ msgid "option not in all_cons_opts"
+#~ msgstr "option non présentante dans all_cons_opts"
+
+#~ msgid "invalid network {0} ({1}) with netmask {2}, this network is an IP"
+#~ msgstr "réseau invalide {0} ({1}) avec masque {2}, ce réseau est une IP"
+
+#~ msgid "invalid IP {0} ({1}) with netmask {2}"
+#~ msgstr "IP invalide {0} ({1}) avec masque {2}"
+
+#~ 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"
+
+#~ msgid ""
+#~ "unable to carry out a calculation, option value with multi types must "
+#~ "have same length for: {0}"
+#~ msgstr ""
+#~ "impossible d'effectuer le calcul, la valeur d'une option avec le type "
+#~ "multi doit avoir la même longueur pour : {0}"
+
+#~ msgid "no child has same nom has master group for: {0}"
+#~ msgstr "pas d'enfant avec le nom du groupe maître pour {0} "
+
+#~ msgid "value must be a boolean"
+#~ msgstr "valeur doit être un booléen"
+
+#~ msgid "value must be an integer"
+#~ msgstr "valeur doit être un nombre entier"
+
+#~ msgid "value must be a float"
+#~ msgstr "valeur doit être un nombre flottant"
+
+#~ msgid "value must be a string, not {0}"
+#~ msgstr "valeur doit être une chaîne, pas {0}"
+
+#~ msgid "value must be an unicode"
+#~ msgstr "valeur doit être une valeur unicode"
 
 #~ msgid "invalid value {0} for option {1} must be different as {2} option"
 #~ msgstr ""
@@ -532,17 +667,6 @@ msgstr "ne peut supprimer une valeur dans l'option multi {0} qui est esclave"
 #~ msgid "invalid name: {0} for optiondescription"
 #~ msgstr "nom invalide : {0} pour l'optiondescription"
 
-#~ msgid "metaconfig's children must be config, not {0}"
-#~ msgstr "enfants d'une metaconfig doit être une config, pas {0}"
-
-#~ msgid "all config in metaconfig must have same optiondescription"
-#~ msgstr ""
-#~ "toutes les configs d'une metaconfig doivent avoir la même "
-#~ "optiondescription"
-
-#~ msgid "child has already a metaconfig's"
-#~ msgstr "enfant a déjà une metaconfig"
-
 #~ msgid "not allowed group_type : {0}"
 #~ msgstr "group_type non autorisé : {0}"
 
diff --git a/translations/tiramisu.pot b/translations/tiramisu.pot
index 57b90e8..81a388e 100644
--- a/translations/tiramisu.pot
+++ b/translations/tiramisu.pot
@@ -5,7 +5,7 @@
 msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
-"POT-Creation-Date: 2013-09-28 19:06+CEST\n"
+"POT-Creation-Date: 2014-03-12 21:49+CET\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"
@@ -15,43 +15,44 @@ msgstr ""
 "Generated-By: pygettext.py 1.5\n"
 
 
-#: tiramisu/autolib.py:144
+#: tiramisu/autolib.py:162
 msgid "unable to carry out a calculation, option {0} has properties: {1} for: {2}"
 msgstr ""
 
-#: tiramisu/autolib.py:153
-msgid "unable to carry out a calculation, option value with multi types must have same length for: {0}"
-msgstr ""
-
-#: tiramisu/config.py:51
+#: tiramisu/config.py:52
 msgid "descr must be an optiondescription, not {0}"
 msgstr ""
 
-#: tiramisu/config.py:126
+#: tiramisu/config.py:127
 msgid "unknown group_type: {0}"
 msgstr ""
 
-#: tiramisu/config.py:162
-msgid "no option description found for this config (may be metaconfig without meta)"
+#: tiramisu/config.py:164 tiramisu/setting.py:339 tiramisu/value.py:57
+#: tiramisu/value.py:485
+msgid "the context does not exist anymore"
 msgstr ""
 
-#: tiramisu/config.py:188
+#: tiramisu/config.py:169
+msgid "no option description found for this config (may be GroupConfig)"
+msgstr ""
+
+#: tiramisu/config.py:195
 msgid "can't assign to an OptionDescription"
 msgstr ""
 
-#: tiramisu/config.py:319
+#: tiramisu/config.py:325
 msgid "unknown type_ type {0}for _find"
 msgstr ""
 
-#: tiramisu/config.py:358
+#: tiramisu/config.py:364
 msgid "no option found in config with these criteria"
 msgstr ""
 
-#: tiramisu/config.py:408
+#: tiramisu/config.py:414
 msgid "make_dict can't filtering with value without option"
 msgstr ""
 
-#: tiramisu/config.py:429
+#: tiramisu/config.py:435
 msgid "unexpected path {0}, should start with {1}"
 msgstr ""
 
@@ -59,411 +60,507 @@ msgstr ""
 msgid "opt in getowner must be an option not {0}"
 msgstr ""
 
-#: tiramisu/option.py:68
+#: tiramisu/config.py:532
+msgid "cannot serialize Config with MetaConfig"
+msgstr ""
+
+#: tiramisu/config.py:546
+msgid "this storage is not serialisable, could be a none persistent storage"
+msgstr ""
+
+#: tiramisu/config.py:609
+msgid "metaconfig's children must be a list"
+msgstr ""
+
+#: tiramisu/config.py:703
+msgid "metaconfig's children should be config, not {0}"
+msgstr ""
+
+#: tiramisu/config.py:707
+msgid "child has already a metaconfig's"
+msgstr ""
+
+#: tiramisu/config.py:711
+msgid "all config in metaconfig must have the same optiondescription"
+msgstr ""
+
+#: tiramisu/option.py:67
 msgid "invalid name: {0} for option"
 msgstr ""
 
-#: tiramisu/option.py:77
+#: tiramisu/option.py:76
 msgid "invalid properties type {0} for {1}, must be a tuple"
 msgstr ""
 
-#: tiramisu/option.py:115
+#: tiramisu/option.py:114
 msgid "'{0}' ({1}) object attribute '{2}' is read-only"
 msgstr ""
 
-#: tiramisu/option.py:142 tiramisu/value.py:360
+#: tiramisu/option.py:141 tiramisu/value.py:395
 msgid "information's item not found: {0}"
 msgstr ""
 
-#: tiramisu/option.py:204
+#: tiramisu/option.py:203
 msgid "cannot serialize Option, only in OptionDescription"
 msgstr ""
 
-#: tiramisu/option.py:307
+#: tiramisu/option.py:306
 msgid "a default_multi is set whereas multi is False in option: {0}"
 msgstr ""
 
-#: tiramisu/option.py:313
+#: tiramisu/option.py:312
 msgid "invalid default_multi value {0} for option {1}: {2}"
 msgstr ""
 
-#: tiramisu/option.py:318
+#: tiramisu/option.py:317
 msgid "default value not allowed if option: {0} is calculated"
 msgstr ""
 
-#: tiramisu/option.py:321
+#: tiramisu/option.py:320
 msgid "params defined for a callback function but no callback defined yet for option {0}"
 msgstr ""
 
-#: tiramisu/option.py:360
-msgid "option not in all_cons_opts"
+#: tiramisu/option.py:425 tiramisu/option.py:450
+msgid "invalid value for option {0}: {1}"
 msgstr ""
 
-#: tiramisu/option.py:432 tiramisu/value.py:545
-msgid "invalid value {0} for option {1}: {2}"
+#: tiramisu/option.py:444
+msgid "warning on the value of the option {0}: {1}"
 msgstr ""
 
-#: tiramisu/option.py:449
-msgid "which must be a list"
+#: tiramisu/option.py:461
+msgid "invalid value {0} for option {1} which must be a list"
 msgstr ""
 
-#: tiramisu/option.py:509
-msgid "consistency should be set with an option"
+#: tiramisu/option.py:519
+msgid "consistency must be set with an option"
 msgstr ""
 
-#: tiramisu/option.py:511
+#: tiramisu/option.py:521
 msgid "cannot add consistency with itself"
 msgstr ""
 
-#: tiramisu/option.py:513
-msgid "every options in consistency should be multi or none"
+#: tiramisu/option.py:523
+msgid "every options in consistency must be multi or none"
 msgstr ""
 
-#: tiramisu/option.py:533
-msgid "same value for {0} and {1}"
+#: tiramisu/option.py:544
+msgid "same value for {0} and {1}, should be different"
 msgstr ""
 
-#: tiramisu/option.py:642
+#: tiramisu/option.py:546
+msgid "same value for {0} and {1}, must be different"
+msgstr ""
+
+#: tiramisu/option.py:640
 msgid "values must be a tuple for {0}"
 msgstr ""
 
-#: tiramisu/option.py:645
+#: tiramisu/option.py:643
 msgid "open_values must be a boolean for {0}"
 msgstr ""
 
-#: tiramisu/option.py:667
+#: tiramisu/option.py:665
 msgid "value {0} is not permitted, only {1} is allowed"
 msgstr ""
 
-#: tiramisu/option.py:679
-msgid "value must be a boolean"
+#: tiramisu/option.py:677
+msgid "invalid boolean"
 msgstr ""
 
-#: tiramisu/option.py:689
-msgid "value must be an integer"
+#: tiramisu/option.py:687
+msgid "invalid integer"
 msgstr ""
 
-#: tiramisu/option.py:699
-msgid "value must be a float"
+#: tiramisu/option.py:697
+msgid "invalid float"
 msgstr ""
 
-#: tiramisu/option.py:709
-msgid "value must be a string, not {0}"
+#: tiramisu/option.py:707
+msgid "invalid string"
 msgstr ""
 
-#: tiramisu/option.py:727
-msgid "value must be an unicode"
+#: tiramisu/option.py:724
+msgid "invalid unicode"
 msgstr ""
 
-#: tiramisu/option.py:739
+#: tiramisu/option.py:736
 msgid "malformed symlinkoption must be an option for symlink {0}"
 msgstr ""
 
-#: tiramisu/option.py:788
-msgid "invalid IP {0}"
+#: tiramisu/option.py:787 tiramisu/option.py:790 tiramisu/option.py:795
+msgid "invalid IP"
 msgstr ""
 
-#: tiramisu/option.py:793
-msgid "IP mustn't not be in reserved class"
+#: tiramisu/option.py:801
+msgid "IP shouldn't be in reserved class"
 msgstr ""
 
-#: tiramisu/option.py:795
-msgid "IP must be in private class"
+#: tiramisu/option.py:803
+msgid "invalid IP, mustn't be in reserved class"
 msgstr ""
 
-#: tiramisu/option.py:833
-msgid "inconsistency in allowed range"
+#: tiramisu/option.py:807
+msgid "IP should be in private class"
 msgstr ""
 
-#: tiramisu/option.py:838
-msgid "max value is empty"
+#: tiramisu/option.py:809
+msgid "invalid IP, must be in private class"
 msgstr ""
 
-#: tiramisu/option.py:877
-msgid "invalid network address {0}"
-msgstr ""
-
-#: tiramisu/option.py:882
-msgid "network shall not be in reserved class"
-msgstr ""
-
-#: tiramisu/option.py:894
-msgid "invalid netmask address {0}"
-msgstr ""
-
-#: tiramisu/option.py:910
-msgid "invalid len for opts"
-msgstr ""
-
-#: tiramisu/option.py:922
-msgid "invalid network {0} ({1}) with netmask {2} ({3}), this network is an IP"
-msgstr ""
-
-#: tiramisu/option.py:927
-msgid "invalid IP {0} ({1}) with netmask {2} ({3}), this IP is a network"
-msgstr ""
-
-#: tiramisu/option.py:932
-msgid "invalid IP {0} ({1}) with netmask {2} ({3})"
-msgstr ""
-
-#: tiramisu/option.py:934
-msgid "invalid network {0} ({1}) with netmask {2} ({3})"
-msgstr ""
-
-#: tiramisu/option.py:948
-msgid "invalid broadcast address {0}"
-msgstr ""
-
-#: tiramisu/option.py:952
+#: tiramisu/option.py:814 tiramisu/option.py:989
 msgid "invalid len for vals"
 msgstr ""
 
-#: tiramisu/option.py:957
+#: tiramisu/option.py:820
+msgid "IP {0} ({1}) not in network {2} ({3}) with netmask {4} ({5})"
+msgstr ""
+
+#: tiramisu/option.py:823
+msgid "invalid IP {0} ({1}) not in network {2} ({3}) with netmask {4} ({5})"
+msgstr ""
+
+#: tiramisu/option.py:864
+msgid "inconsistency in allowed range"
+msgstr ""
+
+#: tiramisu/option.py:869
+msgid "max value is empty"
+msgstr ""
+
+#: tiramisu/option.py:886
+msgid "invalid port, range must have two values only"
+msgstr ""
+
+#: tiramisu/option.py:889
+msgid "invalid port, first port in range must be smaller than the second one"
+msgstr ""
+
+#: tiramisu/option.py:898
+msgid "invalid port"
+msgstr ""
+
+#: tiramisu/option.py:900
+msgid "invalid port, must be an between {0} and {1}"
+msgstr ""
+
+#: tiramisu/option.py:914
+msgid "invalid network address"
+msgstr ""
+
+#: tiramisu/option.py:920
+msgid "network address shouldn't be in reserved class"
+msgstr ""
+
+#: tiramisu/option.py:922
+msgid "invalid network address, mustn't be in reserved class"
+msgstr ""
+
+#: tiramisu/option.py:935
+msgid "invalid netmask address"
+msgstr ""
+
+#: tiramisu/option.py:952
+msgid "invalid len for opts"
+msgstr ""
+
+#: tiramisu/option.py:966
+msgid "invalid IP {0} ({1}) with netmask {2}, this IP is a network"
+msgstr ""
+
+#: tiramisu/option.py:971
+msgid "invalid network {0} ({1}) with netmask {2}"
+msgstr ""
+
+#: tiramisu/option.py:985
+msgid "invalid broadcast address"
+msgstr ""
+
+#: tiramisu/option.py:994
 msgid "invalid broadcast {0} ({1}) with network {2} ({3}) and netmask {4} ({5})"
 msgstr ""
 
-#: tiramisu/option.py:979
+#: tiramisu/option.py:1016
 msgid "unknown type_ {0} for hostname"
 msgstr ""
 
-#: tiramisu/option.py:982
+#: tiramisu/option.py:1019
 msgid "allow_ip must be a boolean"
 msgstr ""
 
-#: tiramisu/option.py:1012
-msgid "invalid value for {0}, must have dot"
+#: tiramisu/option.py:1021
+msgid "allow_without_dot must be a boolean"
 msgstr ""
 
-#: tiramisu/option.py:1015
-msgid "invalid domainname's length for {0} (max {1})"
-msgstr ""
-
-#: tiramisu/option.py:1018
-msgid "invalid domainname's length for {0} (min 2)"
-msgstr ""
-
-#: tiramisu/option.py:1022
-msgid "invalid domainname"
-msgstr ""
-
-#: tiramisu/option.py:1049
-msgid "duplicate option name: {0}"
+#: tiramisu/option.py:1065
+msgid "invalid domainname, must have dot"
 msgstr ""
 
 #: tiramisu/option.py:1067
-msgid "unknown Option {0} in OptionDescription {1}"
+msgid "invalid domainname's length (max 255)"
 msgstr ""
 
-#: tiramisu/option.py:1118
-msgid "duplicate option: {0}"
+#: tiramisu/option.py:1069
+msgid "invalid domainname's length (min 2)"
+msgstr ""
+
+#: tiramisu/option.py:1071
+msgid "invalid domainname"
+msgstr ""
+
+#: tiramisu/option.py:1084
+msgid "invalid email address, must contains one @"
+msgstr ""
+
+#: tiramisu/option.py:1087
+msgid "invalid username in email address"
+msgstr ""
+
+#: tiramisu/option.py:1100
+msgid "invalid url, must start with http:// or https://"
+msgstr ""
+
+#: tiramisu/option.py:1119
+msgid "invalid url, port must be an between 0 and 65536"
+msgstr ""
+
+#: tiramisu/option.py:1125
+msgid "invalid url, must ends with filename"
+msgstr ""
+
+#: tiramisu/option.py:1137
+msgid "invalid username"
 msgstr ""
 
 #: tiramisu/option.py:1148
+msgid "invalid filename"
+msgstr ""
+
+#: tiramisu/option.py:1175
+msgid "duplicate option name: {0}"
+msgstr ""
+
+#: tiramisu/option.py:1193
+msgid "unknown Option {0} in OptionDescription {1}"
+msgstr ""
+
+#: tiramisu/option.py:1244
+msgid "duplicate option: {0}"
+msgstr ""
+
+#: tiramisu/option.py:1275
 msgid "consistency with option {0} which is not in Config"
 msgstr ""
 
-#: tiramisu/option.py:1156
+#: tiramisu/option.py:1283
 msgid "no option for path {0}"
 msgstr ""
 
-#: tiramisu/option.py:1162
+#: tiramisu/option.py:1289
 msgid "no option {0} found"
 msgstr ""
 
-#: tiramisu/option.py:1172
+#: tiramisu/option.py:1299
 msgid "cannot change group_type if already set (old {0}, new {1})"
 msgstr ""
 
-#: tiramisu/option.py:1185
+#: tiramisu/option.py:1311
 msgid "master group {0} shall not have a subgroup"
 msgstr ""
 
-#: tiramisu/option.py:1188
+#: tiramisu/option.py:1314
 msgid "master group {0} shall not have a symlinkoption"
 msgstr ""
 
-#: tiramisu/option.py:1191
+#: tiramisu/option.py:1317
 msgid "not allowed option {0} in group {1}: this option is not a multi"
 msgstr ""
 
-#: tiramisu/option.py:1202
+#: tiramisu/option.py:1327
 msgid "master group with wrong master name for {0}"
 msgstr ""
 
-#: tiramisu/option.py:1211
-msgid "no child has same nom has master group for: {0}"
-msgstr ""
-
-#: tiramisu/option.py:1214
-msgid "group_type: {0} not allowed"
-msgstr ""
-
-#: tiramisu/option.py:1306
-msgid "malformed requirements type for option: {0}, must be a dict"
-msgstr ""
-
-#: tiramisu/option.py:1323
-msgid "malformed requirements for option: {0} require must have option, expected and action keys"
-msgstr ""
-
-#: tiramisu/option.py:1328
-msgid "malformed requirements for option: {0} inverse must be boolean"
-msgstr ""
-
-#: tiramisu/option.py:1332
-msgid "malformed requirements for option: {0} transitive must be boolean"
-msgstr ""
-
-#: tiramisu/option.py:1336
-msgid "malformed requirements for option: {0} same_action must be boolean"
-msgstr ""
-
-#: tiramisu/option.py:1340
-msgid "malformed requirements must be an option in option {0}"
+#: tiramisu/option.py:1335
+msgid "callback of master's option shall not refered a slave's ones"
 msgstr ""
 
 #: tiramisu/option.py:1343
-msgid "malformed requirements option {0} should not be a multi"
+msgid "group_type: {0} not allowed"
 msgstr ""
 
-#: tiramisu/option.py:1349
+#: tiramisu/option.py:1443
+msgid "malformed requirements type for option: {0}, must be a dict"
+msgstr ""
+
+#: tiramisu/option.py:1460
+msgid "malformed requirements for option: {0} require must have option, expected and action keys"
+msgstr ""
+
+#: tiramisu/option.py:1465
+msgid "malformed requirements for option: {0} inverse must be boolean"
+msgstr ""
+
+#: tiramisu/option.py:1469
+msgid "malformed requirements for option: {0} transitive must be boolean"
+msgstr ""
+
+#: tiramisu/option.py:1473
+msgid "malformed requirements for option: {0} same_action must be boolean"
+msgstr ""
+
+#: tiramisu/option.py:1477
+msgid "malformed requirements must be an option in option {0}"
+msgstr ""
+
+#: tiramisu/option.py:1480
+msgid "malformed requirements option {0} must not be a multi"
+msgstr ""
+
+#: tiramisu/option.py:1486
 msgid "malformed requirements second argument must be valid for option {0}: {1}"
 msgstr ""
 
-#: tiramisu/option.py:1354
+#: tiramisu/option.py:1491
 msgid "inconsistency in action types for option: {0} action: {1}"
 msgstr ""
 
-#: tiramisu/option.py:1379
-msgid "{0} should be a function"
+#: tiramisu/option.py:1516
+msgid "{0} must be a function"
 msgstr ""
 
-#: tiramisu/option.py:1382
-msgid "{0}_params should be a dict"
+#: tiramisu/option.py:1519
+msgid "{0}_params must be a dict"
 msgstr ""
 
-#: tiramisu/option.py:1385
-msgid "{0}_params with key {1} should not have length different to 1"
+#: tiramisu/option.py:1522
+msgid "{0}_params with key {1} mustn't have length different to 1"
 msgstr ""
 
-#: tiramisu/option.py:1389
-msgid "{0}_params should be tuple for key \"{1}\""
+#: tiramisu/option.py:1526
+msgid "{0}_params must be tuple for key \"{1}\""
 msgstr ""
 
-#: tiramisu/option.py:1395
+#: tiramisu/option.py:1532
 msgid "validator not support tuple"
 msgstr ""
 
-#: tiramisu/option.py:1398
-msgid "{0}_params should have an option not a {0} for first argument"
+#: tiramisu/option.py:1535
+msgid "{0}_params must have an option not a {0} for first argument"
 msgstr ""
 
-#: tiramisu/option.py:1402
-msgid "{0}_params should have a boolean not a {0} for second argument"
-msgstr ""
-
-#: tiramisu/setting.py:111
-msgid "can't rebind {0}"
+#: tiramisu/option.py:1539
+msgid "{0}_params must have a boolean not a {0} for second argument"
 msgstr ""
 
 #: tiramisu/setting.py:116
+msgid "can't rebind {0}"
+msgstr ""
+
+#: tiramisu/setting.py:121
 msgid "can't unbind {0}"
 msgstr ""
 
-#: tiramisu/setting.py:254
+#: tiramisu/setting.py:272
 msgid "cannot append {0} property for option {1}: this property is calculated"
 msgstr ""
 
-#: tiramisu/setting.py:317
+#: tiramisu/setting.py:363
 msgid "opt and all_properties must not be set together in reset"
 msgstr ""
 
-#: tiramisu/setting.py:332
+#: tiramisu/setting.py:378
 msgid "if opt is not None, path should not be None in _getproperties"
 msgstr ""
 
-#: tiramisu/setting.py:435
+#: tiramisu/setting.py:487
 msgid "cannot change the value for option {0} this option is frozen"
 msgstr ""
 
-#: tiramisu/setting.py:441
+#: tiramisu/setting.py:493
 msgid "trying to access to an option named: {0} with properties {1}"
 msgstr ""
 
-#: tiramisu/setting.py:459
+#: tiramisu/setting.py:511
 msgid "permissive must be a tuple"
 msgstr ""
 
-#: tiramisu/setting.py:466 tiramisu/value.py:299
+#: tiramisu/setting.py:518 tiramisu/value.py:334
 msgid "invalid generic owner {0}"
 msgstr ""
 
-#: tiramisu/setting.py:553
+#: tiramisu/setting.py:606
 msgid "malformed requirements imbrication detected for option: '{0}' with requirement on: '{1}'"
 msgstr ""
 
-#: tiramisu/setting.py:565
+#: tiramisu/setting.py:617
 msgid "option '{0}' has requirement's property error: {1} {2}"
 msgstr ""
 
-#: tiramisu/storage/__init__.py:47
+#: tiramisu/storage/__init__.py:52
 msgid "storage_type is already set, cannot rebind it"
 msgstr ""
 
-#: tiramisu/storage/__init__.py:81
+#: tiramisu/storage/__init__.py:86
 msgid "option {0} not already exists in storage {1}"
 msgstr ""
 
-#: tiramisu/storage/dictionary/storage.py:37
+#: tiramisu/storage/dictionary/storage.py:39
 msgid "dictionary storage cannot delete session"
 msgstr ""
 
-#: tiramisu/storage/dictionary/storage.py:48
+#: tiramisu/storage/dictionary/storage.py:50
 msgid "session already used"
 msgstr ""
 
-#: tiramisu/storage/dictionary/storage.py:50
+#: tiramisu/storage/dictionary/storage.py:52
 msgid "a dictionary cannot be persistent"
 msgstr ""
 
-#: tiramisu/value.py:306
+#: tiramisu/value.py:341
 msgid "no value for {0} cannot change owner to {1}"
 msgstr ""
 
-#: tiramisu/value.py:414
+#: tiramisu/value.py:423
+msgid "can force cache only if cache is actived in config"
+msgstr ""
+
+#: tiramisu/value.py:462
+msgid "{0} is already a Multi "
+msgstr ""
+
+#: tiramisu/value.py:498 tiramisu/value.py:562
 msgid "invalid len for the slave: {0} which has {1} as master"
 msgstr ""
 
-#: tiramisu/value.py:438
-msgid "invalid len for the master: {0} which has {1} as slave with greater len"
-msgstr ""
-
-#: tiramisu/value.py:468
+#: tiramisu/value.py:534
 msgid "cannot append a value on a multi option {0} which is a slave"
 msgstr ""
 
-#: tiramisu/value.py:505
+#: tiramisu/value.py:572
 msgid "cannot sort multi option {0} if master or slave"
 msgstr ""
 
-#: tiramisu/value.py:509
+#: tiramisu/value.py:576
 msgid "cmp is not permitted in python v3 or greater"
 msgstr ""
 
-#: tiramisu/value.py:518
+#: tiramisu/value.py:585
 msgid "cannot reverse multi option {0} if master or slave"
 msgstr ""
 
-#: tiramisu/value.py:526
+#: tiramisu/value.py:593
 msgid "cannot insert multi option {0} if master or slave"
 msgstr ""
 
-#: tiramisu/value.py:534
+#: tiramisu/value.py:601
 msgid "cannot extend multi option {0} if master or slave"
 msgstr ""
 
-#: tiramisu/value.py:562
+#: tiramisu/value.py:612
+msgid "invalid value {0} for option {1}: {2}"
+msgstr ""
+
+#: tiramisu/value.py:630
 msgid "cannot pop a value on a multi option {0} which is a slave"
 msgstr ""