The Jupyter notebook format allows for extensible metadata that can be 
attached to any cell/node.  Leo's present .ipynb exporter uses the 
"leo_headline" metadata to remember headline text.

It would be easy to write a "leo_gnx" metadata item, but that is not 
necessary. Leo's @persistence logic *already *restores clone links in *all* 
@auto trees, including @auto .ipynb trees!  I did not realize this before 
writing this post.

The technical details: PersistenceDataController.restore_gnx calls the 
low-level p._relinkAsCloneOf method.


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