diff --git a/Namespaces.py b/Namespaces.py
index 7815a8d..fc2a508 100755
--- a/Namespaces.py
+++ b/Namespaces.py
@@ -72,7 +72,7 @@ class OASIS:
     '''
     WSSE    = "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"
     UTILITY = "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd"
-    
+    LIFETIME = "http://docs.oasis-open.org/wsrf/2004/06/wsrf-WS-ResourceLifetime-1.2-draft-01.xsd"
 
 class WSSE:
     BASE    = "http://schemas.xmlsoap.org/ws/2002/04/secext"