I have a product built with a ZClass. In the Product (called MethodClass), I have an external method that contains an instance of an HTMLParser from htmllib. That external method is called from the MethodClass_add function (the constructor). I also want to call this external method from a method within the ZClass. When I call it with dtml-call, I get a NameError, which implies that the external method is not acquired, I have no idea how acquisition works within a ZClass product, however. Then I tried creating an external method inside the ZClass that calls the same function, and I get an ugly error that does not happen when the method is called from the Product constructor: Error Type: TypeError Error Value: __add__ nor __radd__ defined for these operands Traceback (innermost last): File /home/sgendler/Zope-2.0.1-src/lib/python/ZPublisher/Publish.py, line 214, in publish_module File /home/sgendler/Zope-2.0.1-src/lib/python/ZPublisher/Publish.py, line 179, in publish File /home/sgendler/Zope-2.0.1-src/lib/python/Zope/__init__.py, line 201, in zpublisher_exception_hook (Object: <string>) File /home/sgendler/Zope-2.0.1-src/lib/python/ZPublisher/Publish.py, line 165, in publish File /home/sgendler/Zope-2.0.1-src/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: manage_stripUpload) File /home/sgendler/Zope-2.0.1-src/lib/python/ZPublisher/Publish.py, line 102, in call_object (Object: manage_stripUpload) File /home/sgendler/Zope-2.0.1-src/lib/python/OFS/DTMLMethod.py, line 145, in __call__ (Object: manage_stripUpload) File /home/sgendler/Zope-2.0.1-src/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: manage_stripUpload) File /home/sgendler/Zope-2.0.1-src/lib/python/DocumentTemplate/DT_Util.py, line 321, in eval (Object: strip_extra_html(REQUEST['file'], REQUEST)) File <string>, line 0, in ? File /home/sgendler/Zope-2.0.1-src/lib/python/Products/ExternalMethod/ExternalMethod.py, line 246, in __call__ (Object: strip_extra_html) (Info: ((<ZPublisher.HTTPRequest.FileUpload instance at 85e6668>,<loads of stuff from the REQUEST structure was here, snipped>, {}, None)) File /home/sgendler/Zope-2.0.1-src/Extensions/test.py, line 19, in StripFile File /var/tmp/python-root/usr/lib/python1.5/sgmllib.py, line 82, in feed TypeError: (see above)