I have been searching through the JDO and JPA docs, but I can't find
info about adding and removing properties at runtime.

The Python interface has the Expando model for this:
http://code.google.com/appengine/docs/python/datastore/expandoclass.html

If I want to read and write my Expando models from Java, do I need to
use the low-level datastore API rather than JDO or JPA?

Thanks,
Johann

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