schema tool

["Yallala, Bhaskar" <B_Yallala@DirectAdvice.com>]

Hello
   Is there any tool that takes input an XMLSchema file and allows the user
to enter data to create a valid XML file?
It should do some validation like checking for integer input for year, month
or date fields etc.
Better an open tool!

Thanks 
Any help is  appreciated!
Bhaskar