[Zope] refering to the id of the enclosing folder in a tree tag

If I have a folder structure like this a a1 a2 a3 b etc. Using a treetag to traverse this how can I refer to the id of the enclosing folder (that is the folder dat contains the 'current' element? I tried this: <dtml-tree reports branches_expr="objectValues(['Folder'])" > <dtml-var "PARENTS[0].id"> <dtml-var id> </dtml-tree> but that gives the id of the folder containing the method which contains this DTML snippet. Any suggestions? Thanks, Lucas -- PGS Seres tel: +47 67514059 PO Box 354 fax: +47 67526506 N-1324 Lysaker Norway