[Zope] Python, persistent objects and caching

Hi, I'm developing a Python-based product that uses persistent objects in ZODB to store its configuration. No surprises there, but my product is also using volatile attributes to do a bit of caching of its own. The thing is, when ZODB takes a sweep every 60 seconds to flush it's own cache it will quite often flush my product as well, essentially rendering my 15 minute caching ineffective. If there a way I can prevent this from happening? References: http://www.zope.org/Members/MikeP/volatile http://www.zope.org/Members/Zen/tips/VolatileAttributes Soren Roug