diff --git a/xos/header.py b/xos/header.py
new file mode 100644
index 0000000..98c7297
--- /dev/null
+++ b/xos/header.py
@@ -0,0 +1,23 @@
+from django.db import models
+from core.models import Service, PlCoreBase, Slice, Instance, Tenant, TenantWithContainer, Node, Image, User, Flavor, NetworkParameter, NetworkParameterType, Port, AddressPool
+from core.models.plcorebase import StrippedCharField
+import os
+from django.db import models, transaction
+from django.forms.models import model_to_dict
+from django.db.models import *
+from operator import itemgetter, attrgetter, methodcaller
+from core.models import Tag
+from core.models.service import LeastLoadedNodeScheduler
+import traceback
+from xos.exceptions import *
+from xos.config import Config
+from django.contrib.contenttypes.models import ContentType
+from django.contrib.contenttypes.fields import GenericForeignKey
+
+class ConfigurationError(Exception):
+    pass
+
+VMME_KIND = "vEPC"
+
+CORD_USE_VTN = getattr(Config(), "networking_use_vtn", False)
+