[Zope] live meta_type upgrading?

Is it possible to change object types of existing objects? My naive idea is just to search/replace each meta_type for all objects in a container as with the ReplaceSupport Product. But this changes only the content not such an important attribute. Such a TypeChange product could check for needed methods and properties and change them (update, delete, insert) on the fly as well. This way the content and children need to be changed (export/re-import or cut/paste). Use Case: Change some folders BTree Folders, ... Change some DTML Documents to DTML Methods, ... Change some ZClasses to real products. -- Reini Urban http://xarch.tu-graz.ac.at/home/rurban/ http://tv.mur.at