OK, this works: My DTML Method, "y": <dtml-tree branches_expr="objectValues(['Folder'])"> foo </dtml-tree> If I change z to read as follows, it breaks: <dtml-tree branches_expr="_['y']"> foo </dtml-tree> where y is a DTML Method simply containing <dtml-return "objectValues(['Folder'])"> The error I get is: <STRONG>Error Type: AttributeError</STRONG><BR> <STRONG>Error Value: __getitem__</STRONG><BR> ... Traceback (innermost last): File /usr/local/Zope-2.2.4-src/lib/python/ZPublisher/Publish.py, line 222, in publish_module File /usr/local/Zope-2.2.4-src/lib/python/ZPublisher/Publish.py, line 187, in publish File /usr/local/Zope-2.2.4-src/lib/python/Zope/__init__.py, line 221, in zpublisher_exception_hook (Object: ApplicationDefaultPermissions) File /usr/local/Zope-2.2.4-src/lib/python/ZPublisher/Publish.py, line 171, in publish File /usr/local/Zope-2.2.4-src/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: y) File /usr/local/Zope-2.2.4-src/lib/python/ZPublisher/Publish.py, line 112, in call_object (Object: y) File /usr/local/Zope-2.2.4-src/lib/python/OFS/DTMLMethod.py, line 172, in __call__ (Object: y) File /usr/local/Zope-2.2.4-src/lib/python/DocumentTemplate/DT_String.py, line 528, in __call__ (Object: y) File /usr/local/Zope-2.2.4-src/lib/python/TreeDisplay/TreeTag.py, line 154, in render (Object: a tree tag) File /usr/local/Zope-2.2.4-src/lib/python/TreeDisplay/TreeTag.py, line 260, in tpRender (Object: ApplicationDefaultPermissions) File /usr/local/Zope-2.2.4-src/lib/python/TreeDisplay/TreeTag.py, line 324, in tpRenderTABLE (Object: ApplicationDefaultPermissions) AttributeError: (see above) This is my boiled down example. The real need for this is because I don't wish to use the full objectValues list, I have another DTML Method which does this: <dtml-call "REQUEST.set('tmpa',[])"> <dtml-in "objectValues(['Folder','Redirector'])"> <dtml-let si=sequence-item> <dtml-if "_.SecurityCheckPermission('Reference in NFGnav', this())"> <dtml-call "tmpa.append(this())"> </dtml-if> </dtml-let> </dtml-in> <dtml-return tmpa> So, for those who are interested in the story, I've been using NFGnav, and have a fair amount of effort invested in marking things as Reference in NFGnav or not, and would like to move to a dtml-tree which respects that setting. The dtml method above gives me a subset of objectValues, those which are maked 'Reference in NFGnav.' Note, also, that this works (stolen from someone on zope.org's tips for debugging a tree): <dtml-in "_['nfgObjectValues']" sort=sortkey> <<stuff>> <dtml-in "_['nfgObjectValues']" sort=sortkey> <<same sort of stuff>> </dtml-in> </dtml-in> where nfgObjectValues is the dtml method above. Any help? Is this a bug in dtml-tree, given that it pukes on something that dtml-in doesn't? Thanks, jim