Index: pyyaml/trunk/lib/yaml/events.py
===================================================================
--- pyyaml/trunk/lib/yaml/events.py	(revision 116)
+++ pyyaml/trunk/lib/yaml/events.py	(revision 118)
@@ -45,4 +45,13 @@
     pass
 
+class DocumentStartEvent(Event):
+    pass
+
+class DocumentEndEvent(Event):
+    pass
+
+class StreamStartEvent(Event):
+    pass
+
 class StreamEndEvent(Event):
     pass