diff --git a/xos/models.py b/xos/models.py
new file mode 100644
index 0000000..8d35039
--- /dev/null
+++ b/xos/models.py
@@ -0,0 +1,447 @@
+from django.db import models, transaction
+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.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 models_decl import VEPCService_decl, VEPCTenant_decl
+from services.vhss.models import VHSSService, VHSSTenant
+from services.vmme.models import VMMEService, VMMETenant
+from services.vmm.models import VMMService, VMMTenant
+from services.vsm.models import VSMService, VSMTenant
+from services.vsgwc.models import VSGWCService, VSGWCTenant
+from services.vsgwu.models import VSGWUService, VSGWUTenant
+from services.vpgwc.models import VPGWCService, VPGWCTenant
+from services.vpgwu.models import VPGWUService, VPGWUTenant
+
+class VEPCService(VEPCService_decl):
+   class Meta:
+        proxy = True
+        
+class VEPCTenant(VEPCTenant_decl):
+   class Meta:
+        proxy = True
+
+   def __init__(self, *args, **kwargs):
+       vepcservices = VEPCService.get_service_objects().all()
+       if vepcservices:
+           self._meta.get_field("provider_service").default = vepcservices[0].id
+       super(VEPCTenant, self).__init__(*args, **kwargs)
+       self.cached_vhss = None
+       self.cached_vmme = None
+       self.cached_vmm = None
+       self.cached_vsm = None
+       self.cached_vsgwc = None
+       self.cached_vsgwu = None
+       self.cached_vpgwc = None
+       self.cached_vpgwu = None
+   
+   @property
+   def vhss(self):
+       vhss = self.get_newest_subscribed_tenant(VHSSTenant)
+       if not vhss:
+           return None
+
+       if (self.cached_vhss) and (self.cached_vhss.id == vhss.id):
+           return self.cached_vhss
+
+       vhss.caller = self.creator
+       self.cached_vhss = vhss
+       return vhss
+
+   @vhss.setter
+   def vhss(self, value):
+       raise XOSConfigurationError("VEPCTenant.vhss setter is not implemented")
+
+   def get_vhss_service(self):
+       vhssservices = VHSSService.get_service_objects().all()
+       if not vhssservices:
+           raise XOSConfigurationError("No VHSS Services available")
+       return vhssservices[0]
+
+   def manage_vhss(self):
+       # Each vEPC object owns exactly one VHSSTenant object
+       if self.deleted:
+           return
+
+       if self.has_vhss:
+           if self.vhss is None:
+               vhss = self.get_vhss_service().create_tenant(subscriber_tenant=self, creator=self.creator)
+               #vhss = self.get_vhss_service().create_tenant(subscriber_tenant=self, creator=self.creator, vhss_vendor=self.vhss_vendor)
+       else:
+           if self.vhss:
+               self.cleanup_vhss()
+
+   def cleanup_vhss(self):
+       if self.vhss:
+           self.vhss.delete()
+
+   @property
+   def vmme(self):
+       vmme = self.get_newest_subscribed_tenant(VMMETenant)
+       if not vmme:
+           return None
+
+       if (self.cached_vmme) and (self.cached_vmme.id == vmme.id):
+           return self.cached_vmme
+
+       vmme.caller = self.creator
+       self.cached_vmme = vmme
+       return vmme
+
+   @vmme.setter
+   def vmme(self, value):
+       raise XOSConfigurationError("VEPCTenant.vmme setter is not implemented")
+
+   def get_vmme_service(self):
+       vmmeservices = VMMEService.get_service_objects().all()
+       if not vmmeservices:
+           raise XOSConfigurationError("No VMME Services available")
+       return vmmeservices[0]
+
+   def manage_vmme(self):
+       # Each vEPC object owns exactly one VMMETenant object
+       if self.deleted:
+           return
+
+       if self.has_vmme:
+           if self.vmme is None:
+               vmme = self.get_vmme_service().create_tenant(subscriber_tenant=self, creator=self.creator)
+	       #vmme = self.get_vmme_service().create_tenant(subscriber_tenant=self, creator=self.creator, vmme_vendor=self.vmme_vendor)
+       else:
+           if self.vmme:
+               self.cleanup_vmme()
+
+   def cleanup_vmme(self):
+       if self.vmme:
+           self.vmme.delete()
+
+   @property
+   def vmm(self):
+       vmm = self.get_newest_subscribed_tenant(VMMTenant)
+       if not vmm:
+           return None
+
+       if (self.cached_vmm) and (self.cached_vmm.id == vmm.id):
+           return self.cached_vmm
+
+       vmm.caller = self.creator
+       self.cached_vmm = vmm
+       return vmm
+
+   @vmm.setter
+   def vmm(self, value):
+       raise XOSConfigurationError("VEPCTenant.vmm setter is not implemented")
+
+   def get_vmm_service(self):
+       vmmservices = VMMService.get_service_objects().all()
+       if not vmmservices:
+           raise XOSConfigurationError("No VMM Services available")
+       return vmmservices[0]
+
+   def manage_vmm(self):
+       # Each vEPC object owns exactly one VMMTenant object
+       if self.deleted:
+           return
+
+       if self.has_vmm:
+           if self.vmm is None:
+               vmm = self.get_vmm_service().create_tenant(subscriber_tenant=self, creator=self.creator)
+	       #vmm = self.get_vmm_service().create_tenant(subscriber_tenant=self, creator=self.creator, vmm_vendor=self.vmm_vendor)
+       else:
+           if self.vmm:
+               self.cleanup_vmm()
+
+   def cleanup_vmm(self):
+       if self.vmm:
+           self.vmm.delete()
+
+   @property
+   def vsm(self):
+       vsm = self.get_newest_subscribed_tenant(VSMTenant)
+       if not vsm:
+           return None
+
+       if (self.cached_vsm) and (self.cached_vsm.id == vsm.id):
+           return self.cached_vsm
+
+       vsm.caller = self.creator
+       self.cached_vsm = vsm
+       return vsm
+
+   @vsm.setter
+   def vsm(self, value):
+       raise XOSConfigurationError("VEPCTenant.vsm setter is not implemented")
+
+   def get_vsm_service(self):
+       vsmservices = VSMService.get_service_objects().all()
+       if not vsmservices:
+           raise XOSConfigurationError("No VSM Services available")
+       return vsmservices[0]
+
+   def manage_vsm(self):
+       # Each vEPC object owns exactly one VSMTenant object
+       if self.deleted:
+           return
+
+       if self.has_vsm:
+           if self.vsm is None:
+               vsm = self.get_vsm_service().create_tenant(subscriber_tenant=self, creator=self.creator)
+	       #vsm = self.get_vsm_service().create_tenant(subscriber_tenant=self, creator=self.creator, vsm_vendor=self.vsm_vendor)
+       else:
+           if self.vsm:
+               self.cleanup_vsm()
+
+   def cleanup_vsm(self):
+       if self.vsm:
+           self.vsm.delete()
+
+   @property
+   def vsgwc(self):
+       vsgwc = self.get_newest_subscribed_tenant(VSGWCTenant)
+       if not vsgwc:
+           return None
+
+       if (self.cached_vsgwc) and (self.cached_vsgwc.id == vsgwc.id):
+           return self.cached_vsgwc
+
+       vsgwc.caller = self.creator
+       self.cached_vsgwc = vsgwc
+       return vsgwc
+
+   @vsgwc.setter
+   def vsgwc(self, value):
+       raise XOSConfigurationError("VEPCTenant.vsgwc setter is not implemented")
+
+   def get_vsgwc_service(self):
+       vsgwcservices = VSGWCService.get_service_objects().all()
+       if not vsgwcservices:
+           raise XOSConfigurationError("No VSGWC Services available")
+       return vsgwcservices[0]
+
+   def manage_vsgwc(self):
+       # Each vEPC object owns exactly one VSGWCTenant object
+       if self.deleted:
+           return
+
+       if self.has_vsgwc:
+           if self.vsgwc is None:
+               vsgwc = self.get_vsgwc_service().create_tenant(subscriber_tenant=self, creator=self.creator)
+	       #vsgwc = self.get_vsgwc_service().create_tenant(subscriber_tenant=self, creator=self.creator, vsgwc_vendor=self.vsgwc_vendor)
+       else:
+           if self.vsgwc:
+               self.cleanup_vsgwc()
+
+   def cleanup_vsgwc(self):
+       if self.vsgwc:
+           self.vsgwc.delete()
+
+   @property
+   def vsgwu(self):
+       vsgwu = self.get_newest_subscribed_tenant(VSGWUTenant)
+       if not vsgwu:
+           return None
+
+       if (self.cached_vsgwu) and (self.cached_vsgwu.id == vsgwu.id):
+           return self.cached_vsgwu
+
+       vsgwu.caller = self.creator
+       self.cached_vsgwu = vsgwu
+       return vsgwu
+
+   @vsgwu.setter
+   def vsgwu(self, value):
+       raise XOSConfigurationError("VEPCTenant.vsgwu setter is not implemented")
+
+   def get_vsgwu_service(self):
+       vsgwuservices = VSGWUService.get_service_objects().all()
+       if not vsgwuservices:
+           raise XOSConfigurationError("No VSGWU Services available")
+       return vsgwuservices[0]
+
+   def manage_vsgwu(self):
+       # Each vEPC object owns exactly one VSGWUTenant object
+       if self.deleted:
+           return
+
+       if self.has_vsgwu:
+           if self.vsgwu is None:
+               vsgwu = self.get_vsgwu_service().create_tenant(subscriber_tenant=self, creator=self.creator)
+	       #vsgwu = self.get_vsgwu_service().create_tenant(subscriber_tenant=self, creator=self.creator, vsgwu_vendor=self.vsgwu_vendor)
+       else:
+           if self.vsgwu:
+               self.cleanup_vsgwu()
+
+   def cleanup_vsgwu(self):
+       if self.vsgwu:
+           self.vsgwu.delete()
+
+   @property
+   def vpgwc(self):
+       vpgwc = self.get_newest_subscribed_tenant(VPGWCTenant)
+       if not vpgwc:
+           return None
+
+       if (self.cached_vpgwc) and (self.cached_vpgwc.id == vpgwc.id):
+           return self.cached_vpgwc
+
+       vpgwc.caller = self.creator
+       self.cached_vpgwc = vpgwc
+       return vpgwc
+
+   @vpgwc.setter
+   def vpgwc(self, value):
+       raise XOSConfigurationError("VEPCTenant.vpgwc setter is not implemented")
+
+   def get_vpgwc_service(self):
+       vpgwcservices = VPGWCService.get_service_objects().all()
+       if not vpgwcservices:
+           raise XOSConfigurationError("No VPGWC Services available")
+       return vpgwcservices[0]
+
+   def manage_vpgwc(self):
+       # Each vEPC object owns exactly one VPGWCTenant object
+       if self.deleted:
+           return
+
+       if self.has_vpgwc:
+           if self.vpgwc is None:
+               vpgwc = self.get_vpgwc_service().create_tenant(subscriber_tenant=self, creator=self.creator)
+	       #vpgwc = self.get_vpgwc_service().create_tenant(subscriber_tenant=self, creator=self.creator, vpgwc_vendor=self.vpgwc_vendor)
+       else:
+           if self.vpgwc:
+               self.cleanup_vpgwc()
+
+   def cleanup_vpgwc(self):
+       if self.vpgwc:
+           self.vpgwc.delete()
+
+   @property
+   def vpgwu(self):
+       vpgwu = self.get_newest_subscribed_tenant(VPGWUTenant)
+       if not vpgwu:
+           return None
+
+       if (self.cached_vpgwu) and (self.cached_vpgwu.id == vpgwu.id):
+           return self.cached_vpgwu
+
+       vpgwu.caller = self.creator
+       self.cached_vpgwu = vpgwu
+       return vpgwu
+
+   @vpgwu.setter
+   def vpgwu(self, value):
+       raise XOSConfigurationError("VEPCTenant.vpgwu setter is not implemented")
+
+   def get_vpgwu_service(self):
+       vpgwuservices = VPGWUService.get_service_objects().all()
+       if not vpgwuservices:
+           raise XOSConfigurationError("No VPGWU Services available")
+       return vpgwuservices[0]
+
+   def manage_vpgwu(self):
+       # Each vEPC object owns exactly one VPGWUTenant object
+       if self.deleted:
+           return
+
+       if self.has_vpgwu:
+           if self.vpgwu is None:
+               vpgwu = self.get_vpgwu_service().create_tenant(subscriber_tenant=self, creator=self.creator)
+	       #vpgwu = self.get_vpgwu_service().create_tenant(subscriber_tenant=self, creator=self.creator, vpgwu_vendor=self.vpgwu_vendor)
+       else:
+           if self.vpgwu:
+               self.cleanup_vpgwu()
+
+   def cleanup_vpgwu(self):
+       if self.vpgwu:
+           self.vpgwu.delete()
+
+   def cleanup_orphans(self):
+       # ensure vMME only has at most one of each service
+       cur_vhss = self.vhss
+       cur_vmme = self.vmme
+       cur_vmm = self.vmm
+       cur_vsm = self.vsm
+       cur_vsgwc = self.vsgwc
+       cur_vsgwu = self.vsgwu
+       cur_vpgwc = self.vpgwc
+       cur_vpgwu = self.vpgwu
+          
+       for vhss in list(self.get_subscribed_tenants(VHSSTenant)):
+           if (not cur_vhss) or (vhss.id != cur_vhss.id):
+               vhss.delete()
+   
+       for vmme in list(self.get_subscribed_tenants(VMMETenant)):
+           if (not cur_vmme) or (vmme.id != cur_vmme.id):
+               vmme.delete()
+   
+       for vmm in list(self.get_subscribed_tenants(VMMTenant)):
+           if (not cur_vmm) or (vmm.id != cur_vmm.id):
+               vmm.delete()
+   
+       for vsm in list(self.get_subscribed_tenants(VSMTenant)):
+           if (not cur_vsm) or (vsm.id != cur_vsm.id):
+               vsm.delete()
+   
+       for vsgwc in list(self.get_subscribed_tenants(VSGWCTenant)):
+           if (not cur_vsgwc) or (vsgwc.id != cur_vsgwc.id):
+               vsgwc.delete()
+   
+       for vsgwu in list(self.get_subscribed_tenants(VSGWUTenant)):
+           if (not cur_vsgwu) or (vsgwu.id != cur_vsgwu.id):
+               vsgwu.delete()
+   
+       for vpgwc in list(self.get_subscribed_tenants(VPGWCTenant)):
+           if (not cur_vpgwc) or (vpgwc.id != cur_vpgwc.id):
+               vpgwc.delete()
+   
+       for vpgwu in list(self.get_subscribed_tenants(VPGWUTenant)):
+           if (not cur_vpgwu) or (vpgwu.id != cur_vpgwu.id):
+               vpgwu.delete()
+   
+   def save(self, *args, **kwargs):
+       #https://stackoverflow.com/questions/31831620/can-i-make-at-least-one-field-a-requirement-on-a-django-model
+       if not (self.has_vhss or self.has_vmme or self.has_vmm or self.has_vsm or self.has_vsgwc or self.has_vsgwu or self.has_vpgwc or self.has_vpgwu):
+           raise XOSConfigurationError("Cannot have an empty service chain")
+   
+       super(VEPCTenant, self).save(*args, **kwargs)
+       # This call needs to happen so that an instance is created for this
+       # tenant is created in the slice. One instance is created per tenant.
+       model_policy_vepctenant(self.pk)
+
+   def delete(self, *args, **kwargs):
+       # Delete the dependent instances on this service chain tenant
+       self.cleanup_vhss()
+       self.cleanup_vmme()
+       self.cleanup_vmm()
+       self.cleanup_vsm()
+       self.cleanup_vsgwc()
+       self.cleanup_vsgwu()
+       self.cleanup_vpgwc()
+       self.cleanup_vpgwu()
+       super(VEPCTenant, self).delete(*args, **kwargs)
+   
+def model_policy_vepctenant(pk):
+    # TODO: this should be made in to a real model_policy
+    with transaction.atomic():
+        tenant = VEPCTenant.objects.select_for_update().filter(pk=pk)
+        if not tenant:
+            return
+        tenant = tenant[0]
+        tenant.manage_vhss()
+        tenant.manage_vmme()
+        tenant.manage_vmm()
+        tenant.manage_vsm()
+        tenant.manage_vsgwc()
+        tenant.manage_vsgwu()
+        tenant.manage_vpgwc()
+        tenant.manage_vpgwu()
+        tenant.cleanup_orphans()
+