This is for people who've implemented ZODB data managers. Data managers are components that manage persistent data under transaction control, We've recently tried to clean up and document the data-manager interfaces. In addition, over the weekend, I implemented savepoints and was able to simplify the interfaces quite a bit. See IDataManager and ISavePointDatamanager in: http://svn.zope.org/ZODB/trunk/src/transaction/interfaces.py?view=markup In particular, note that: - The subtransaction APIs have disappeared fro data managers, and - tpc_begin no longer takes a second "subtransaction" argument. I *could* try to provide support for data managers with tpc_begin taking 2 arguments, but I'm guessing that I don't need to. I'm guessing that no one has written data managers that require a second argument. If this is not true and you have a data manager that requires a second argument that I need to support, please let me know. Jim -- Jim Fulton mailto:jim@zope.com Python Powered! CTO (540) 361-1714 http://www.python.org Zope Corporation http://www.zope.com http://www.zope.org