allow slices to be attached to services, fix CORD sample mysite_vcpe slice
diff --git a/xos/tosca/resources/slice.py b/xos/tosca/resources/slice.py
index 073e205..5c576be 100644
--- a/xos/tosca/resources/slice.py
+++ b/xos/tosca/resources/slice.py
@@ -5,7 +5,7 @@
 sys.path.append("/opt/tosca")
 from translator.toscalib.tosca_template import ToscaTemplate
 
-from core.models import Slice,User,Site,Network,NetworkSlice,SliceRole,SlicePrivilege
+from core.models import Slice,User,Site,Network,NetworkSlice,SliceRole,SlicePrivilege,Service
 
 from xosresource import XOSResource
 
@@ -14,10 +14,18 @@
     xos_model = Slice
 
     def get_xos_args(self):
+        args = {"name": self.nodetemplate.name}
+
         site_name = self.get_requirement("tosca.relationships.MemberOfSite", throw_exception=True)
         site = self.get_xos_object(Site, login_base=site_name)
-        return {"name": self.nodetemplate.name,
-                "site": site}
+        args["site"] = site
+
+        serviceName = self.get_requirement("tosca.relationships.MemberOfService", throw_exception=False)
+        if serviceName:
+            service = self.get_xos_object(Service, name=serviceName)
+            args["service"] = service
+
+        return args
 
     def postprocess(self, obj):
         for net_name in self.get_requirements("tosca.relationships.ConnectsToNetwork"):
diff --git a/xos/tosca/samples/cord.yaml b/xos/tosca/samples/cord.yaml
index 72a069d..f160cb6 100644
--- a/xos/tosca/samples/cord.yaml
+++ b/xos/tosca/samples/cord.yaml
@@ -42,7 +42,7 @@
       type: tosca.nodes.Slice
       requirements:
           - vcpe_service:
-              node: service_volt
+              node: service_vcpe
               relationship: tosca.relationships.MemberOfService
           - site:
               node: mysite