Sorry but I can't understand why you do need to know the format of Data.fs. Why don't you do the follwoing. 1. Install another instance of Zope and replace its Data.fs with the copy of your current Data.fs 2. Write some Python Methods 3. Let them create your ZClasses from the original Folder tree('s DTMLDocuments). 4. See whether you get the desired result in live. 5. If it went wrong, Undo 3 in a click and debug your Python Methods and repeat 3-4. 6. If it went well, replace the resulting Data.fs with the origianl Data.fs If you insist, bbb.py(or fixbbb.py?) from utilities directory will output the conent of Data.fs in XML, IIRC. But, If you do in that way, you would 1. Get the Data.fs in XML format. 2. Write a module to extract the desired info from the XML file. 3. Write a medule and a method to .... .... It seems a lot complicated than the first way. IMHO. Anyway you might get more versed in Zope in the first way. ;-). oh-this-is-not-an-answer, sorry. LEE, Kwan Soo.