[Zope] merging two databases

Hi, I have an old installation of Zope with a lot of ZWiki-pages that I would like to merge into another installation. The old installation only resides on backup-tape, so it would be nice if I just could open the Data.fs file from the old installation into the new installation and select the pages I would like to copy into the new installation. Is that possible? Any suggestions how I should do this? Is this a FAQ? / Erik Eriksson