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Self referencing composite datatype

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Hello,
I wanted to create a composite datatype to represent a Node. So it would have a few attributes and an array of type Node which is the children of this node.
create type Node as (r integer, s integer, children Node []); 
But i get error type Node[] does not exist. I understand that Node is not defined hence the error.
But how do i get around this problem? 

regards
Sameer

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