[Zope] zope subtransactions with atomic commits

[Joseph Wayne Norton]

Kapil -

I have been doing some searching through some of the zope mail
archives and the zope.org site.  I ran across the following e-mail
(quite old) from you ...

  http://zope.nipltd.com/public/lists/zope-archive.nsf/242bb7cc2b2c343d802568ab003585d4/6a900d1f029e6ef38025693600744914?OpenDocument

I'm wondering if you have any further updates on the above subject.  I
have a similar requirement. 

I would like to be able to perform 1 or more "checkpoints" within a
single zope request.  If the request transaction is aborted, then only
changes since the most recent "checkpoint" should be rolledback.

Any ideas or suggestions?

- j