First of all, thanks Dieter, that answered my question 1. Now I've got a more serious problem. I have a CMF Document that wraps a PageTemplate object (it does not extend PageTemplate, but internally stores a PageTemplate instance). It looks like when some revision of my object is retreived from ZODB, this does not include the wraped persistent objects that my object may contain. For example, rev1._get_pt.read() and rev2._get_pt.read() always return the HTML of the current revision's wraped PageTemplate. (_get_pt() returns the wraped PageTemplate object) Is there a workaround for this ? The only thing I can think of is storing the PageTemplate HTML at my object level each time it is changed, but that means storing the HTML twice in ZODB... I tried it, and of course it works. Pascal ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept by MIMEsweeper for the presence of computer viruses. www.mimesweeper.com **********************************************************************