#encoding: utf-8
+from UserDict import DictMixin
+
from django.core.exceptions import ValidationError
from django.core.urlresolvers import NoReverseMatch
from django.core.validators import RegexValidator, MinValueValidator
from django.db import models
from django.forms.models import model_to_dict
-from philo.models import TreeEntity, Node, TreeManager, Entity, TargetURLModel
-from philo.validators import RedirectValidator
-from UserDict import DictMixin
+
+from philo.models.base import TreeEntity, TreeManager, Entity
+from philo.models.nodes import Node, TargetURLModel
DEFAULT_NAVIGATION_DEPTH = 3