The W3C XQuery working group has published an updated working draft of 
XQuery 1.1 and XQuery 1.1 Use Cases. New features since XQuery 1.0 include:
	-   Added 3.8.4 Group By Clause to FLWOR Expression.
-    Added 3.8.2 Window Clauses to FLWOR Expression.
- try/catch
-  Nondeterministic external functions
-  "count" clause in FLWOR
-  Outer For 
- Query prolog syntax to specify how decimal numbers are formatted.