I need to interate through a set of objects (in this case, DTML Documents) and set a particular boolean property to FALSE. I looked at the documentation, and found something similar in the Zope Book. However, something must be missing in the translation, because the following code... <dtml-in expr="objectValues('DTML Document')"> <dtml-call expr="manage_changeProperty(on_host_committee=0)"> </dtml-in> .. generates an attribute error, namely: Zope Error Zope has encountered an error while publishing this resource. Error Type: AttributeError Error Value: manage_changeProperty Troubleshooting Suggestions * The URL may be incorrect. * The parameters passed to this resource may be incorrect. * A resource that this resource relies on may be encountering an error. For more detailed information about the error, please refer to the HTML source for this page. If the error persists please contact the site maintainer. Thank you for your patience. Traceback (innermost last): File /home/zope/Zope-2.4.4-src/lib/python/ZPublisher/Publish.py, line 223, in publish_module File /home/zope/Zope-2.4.4-src/lib/python/ZPublisher/Publish.py, line 187, in publish File /home/zope/Zope-2.4.4-src/lib/python/Zope/__init__.py, line 226, in zpublisher_exception_hook (Object: class) File /home/zope/Zope-2.4.4-src/lib/python/ZPublisher/Publish.py, line 171, in publish File /home/zope/Zope-2.4.4-src/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: do_it) File /home/zope/Zope-2.4.4-src/lib/python/ZPublisher/Publish.py, line 112, in call_object (Object: do_it) File /home/zope/Zope-2.4.4-src/lib/python/OFS/DTMLMethod.py, line 200, in __call__ (Object: do_it) File /home/zope/Zope-2.4.4-src/lib/python/DocumentTemplate/DT_String.py, line 546, in __call__ (Object: do_it) File /home/zope/Zope-2.4.4-src/lib/python/DocumentTemplate/DT_In.py, line 770, in renderwob (Object: objectValues('DTML Document')) File /home/zope/Zope-2.4.4-src/lib/python/DocumentTemplate/DT_Util.py, line 231, in eval (Object: _.manage_changeProperty(on_host_committee=0)) (Info: _) File <string>, line 2, in f File /home/zope/Zope-2.4.4-src/lib/python/AccessControl/DTML.py, line 101, in guarded_getattr (Object: do_it) File /home/zope/Zope-2.4.4-src/lib/python/AccessControl/ZopeGuards.py, line 109, in guarded_getattr AttributeError: (see above) There isn't a whole lot of documentation on this subject, but I think there should be. Does anyone have a gentle hint as to what I'm aparently missing? TIA, Ron