> Anyway, It's not possible with wicket to store state of tree in url, and 
> I doubt it ever will be. URL length is limited so it wouldn't work for 
> bigger trees. And wicket is managing state for whole pages, so it makes 
> no sense to "ad-hoc" store state of tree in URL either.

In my case, the tree is "read only", so to speak. The tree never
changes. The only state I need to store is which is the open branch,
which requires only one parameter. For instance:


Only one branch can be open at a time. Therefore, the parameter above is
enough to allow me to render the tree correctly.


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