+                                               ->addDefaultsIfNotSet()
+                                               ->ignoreExtraKeys()
+                                               ->children()
+                                                       ->scalarNode('civility')->cannotBeEmpty()->defaultValue($defaults['class']['civility'])->end()
+                                                       ->scalarNode('group')->cannotBeEmpty()->defaultValue($defaults['class']['group'])->end()
+                                                       ->scalarNode('user')->cannotBeEmpty()->defaultValue($defaults['class']['user'])->end()
+                                               ->end()