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Revisit the API to storing the extra data required by the node editors. Rather than the current approach which is based on properties I want to explore creating a class hierarchy of the extra data and using the XMLEncoder to store the data. This should be cleaner, quicker to load and much less obscure.
In order to be as flexible as possible the extra data objects should be available as a list for each Node. This would enable two or more editors for the same node to co-exist and maintain integrity of the specialized data for each editor panel.