--- a/ztfy/utils/tal/interfaces.py	Wed Nov 10 07:34:24 2010 +0100
+++ b/ztfy/utils/tal/interfaces.py	Fri Nov 12 14:54:48 2010 +0100
@@ -71,3 +71,10 @@
 
     def __getattr__(attr):
         """Get request data for given attribute"""
+
+
+class ISessionDataTalesAPI(Interface):
+    """Session data TALES namespace interface"""
+
+    def __getattr__(attr):
+        """Get session data for given app and key"""