question on schemas

Hello,

is it possible to OR schemas in SmartFrog ? E.g. I have component which 
either has to have attribute

a1 String
a2 String 

OR

b1 Vector

"OR" means that it should be also possible to have a1,a2,b1 present but 
not a1,b1 or a2,b1 or none of the above.

Thanks,
Andreas


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