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I have a schema which needs to be altered. The current structure looks like: <Foo> <A/> <B/> <C/> <D/> </Foo> The new structure has to be like: <Foo> <A/> <B> <BB/> <NN/> </B> <C/> <D/> </Foo> The conditions are elements "BB" & "NN" can both exist or atleast one of these elements should exist. How would I enforce this in a schema design. Thanks -G

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Help in changing design of existing schmea