[Zope] creating multiple mountpoints in zope.conf

Hi there, I would like to create a site that includes the Data.fs of other sites as mount points. What I would like to do is the following: Site A with using : Data.fs (which is "private") Data.fs.pub (which is "public") Site B: mounts Site A's Data.fs.pub as /shared/site_a How would I do this? Where can I find more documentaion on this? Thanks Robert