[Zope] Folderish object with linking to other Folders

Dear Reader I want to extend the folder object with the capability the link to other folders not in the folder. Folder1/Folder2 (Folder1 is parent of folder2) Folder1~Folder2 (Folder1 is related to Folder2) I could make a python script which returns all folder that I want to link to, but I'm looking for something a bit more dynamic. \Oliver