need to cast ids to string

diff --git a/sfa/util/xrn.py b/sfa/util/xrn.py
index 76c55be..31f77f2 100644 (file)
--- a/sfa/util/xrn.py
+++ b/sfa/util/xrn.py
@@ -9,7 +9,7 @@ def urn_to_hrn(urn): xrn=Xrn(urn); return (xrn.hrn, xrn.type)
 def hrn_to_urn(hrn,type): return Xrn(hrn, type=type).urn
 
 def urn_to_sliver_id(urn, slice_id, node_id, index=0):
-    return ":".join([urn, slice_id, node_id, index])
+    return ":".join([urn, str(slice_id), str(node_id), str(index)])
 
 class Xrn: