tool support schema for xs:extension or away to replace it

["CAUBEL, Hugues" <hugues.caubel@airbus.com>]

I would like to know if you have some feedback on the support of tool (parser, editor) for schema that use xs:entension. It seems fine with xmlSpy, Xerces and XSV, but may be it is not always the case with other tool. 

In the beginning to avoid risk, i was looking for a way to use xs:group to do the same kind of task - but i could not do it


 i have a sequence of elements 





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