[Zope] merge two ZODB

Hello, I want to merge two Zope instances with different Data.fs to one. First thing I tried was Export and Import the objects from one instance to the other. Problem: the dates and undo information are not preserved. Is it possible to "mount" two Data.fs and copy from one Data.fs to the other? Or how could I preserve undo and the modify date of the objects? I couldn't find anything on zope.org and in the mailing list archive. Please reply also to my private email address, because I cannot read the mailing list today. -- GMX - Die Kommunikationsplattform im Internet. http://www.gmx.net