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Display a XML file on JTree Problem (validation of change of node)

 
Stephen Lee
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I am now creating a JTree which displays XML file while I am now using xerces-J 1.4.4. in my JTree, the user can add the node or remove the node of the JTree.
I want that right click on a node of JTree will display a popup menu. This menu has the name of the node which allows to be added. However, how can I check whether the change of the JTree is valid? for example, in the add case of element to JTree, I want to check whether the new node allows to be added in that place.
Any idea?
thanks!
 
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