AJAX XML or JSON Questions, Examples?

Is the persistence of HopObjects in Helma automatic - are all HopObjects
automatically saved to disk? Or upon a JSON or XML post request, do you have
to manually copy data to the HopObject from the req and flush out via the
XML object? Is there always one root object or does each user get their own
root object? If each user/session gets it's own root HopObject, how is this
reflected on disk?

I love the fact that application data can persist to disk without needing an
SQL database but I'm still trying to wrap my head around it all. I really
wish I could find more examples. I am really interested initially in using
Helma for AJAX requests and would love more examples. If I do an
HttpRequestObject post does the data automatically persist to a HopObject or
so I have to do something?

Thanks,
Philip

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