This is driving me crazy. I can't for the life of me figure out how dtml-tree is hooked into the template machinery. It looks like the tag is implemented in the class TreeDisplay.TreeTag.Tree. Yet searching for these modules yields only: ---- TreeTag Matches (2) ---- __init__.py (c:\program files\zope\lib\python\treedisplay):import TreeTag TreeTag.py (c:\program files\zope\lib\python\treedisplay):__rcs_id__='$Id: TreeTag.py,v 1.39 1999/11/12 16:25:49 brian Exp $' ---- TreeDisplay Matches (3) ---- Globals.py (c:\program files\zope\lib\python):import TreeDisplay, string Misc_.py (c:\program files\zope\lib\python\ofs): pl=ImageFile('TreeDisplay/www/Plus_icon.gif') Misc_.py (c:\program files\zope\lib\python\ofs): mi=ImageFile('TreeDisplay/www/Minus_icon.gif') Tree has too many matches to list, but none of them match the Tree class listed above. What blows me away is this bit from DocumentTemplate.DT_String: commands={ 'var': Var, 'call': Call, 'in': ('in', 'DT_In','In'), 'with': ('with', 'DT_With','With'), 'if': ('if', 'DT_If','If'), 'unless': ('unless', 'DT_If','Unless'), 'else': ('else', 'DT_If','Else'), 'comment': Comment, 'raise': ('raise', 'DT_Raise','Raise'), 'try': ('try', 'DT_Try','Try'), 'let': ('let', 'DT_Let', 'Let'), 'return': ReturnTag, } No tree!! The in DT_String.parseTag and DT_HTML.parseTag: try: return tag, args, self.commands[name], None except KeyError: raise ParseError, ('Unexpected tag', tag) No exception for 'tree'. I don't see 'parseTag' or 'commands' overridden in DTMLMethod, nor is 'commands' overridden in DT_HTML. This is with Zope version: Zope 2.1.4. The dtml-tree tag does work, I just can't figure out how. Can someone in the know please take a moment to enlighten me? Thanks, -jfarr