Hi, The "this()" method returns the object itself. Or at least that's what it's supposed to do. But if I have a folder named "myFolder" inside which I have a DTML method named "myMethod" consisting of the following lines: <dtml-if "this() == myFolder"> Hallo <dtml-else> Bye-Bye </dtml-if> The result is always Bye-Bye, when viewing myMethod. So the "this()" method is tricky. In the same league is the "id()" method, which is also tricky. And often I have to use "_['id']" to get what I want. The following works: <dtml-if "this().id == myFolder.id"> Hallo <dtml-else> Bye-Bye </dtml-if> However, this does not work: <dtml-if "this.id == myFolder.id"> Hallo <dtml-else> Bye-Bye </dtml-if> All these weird behaviors of "this()" and "id()" are sending my head spinning. When to use parenthesis, when not to use parenthesis, when to use "_['id']", when you can use ".", when you can't use ".", argghhhh.... Is there any doc on "this()" or "id()"? Aside from the "How-to..." docs, shouldn't we start compiling "Zope Pitfalls" or "Zope Gotchas" doc series? Sometimes learning a new software is not so much what you know to do, but what you know NOT TO DO. Also, is there any documentation on calling DTML methods with arguments? I know you can do it with "myMethod(_.None, _, arg1=val1, arg2=val2, ...)", but I'd like to know what the role of _.None is. (I know _ is the namespace...), that is, if I replace it with something like "myMethod(coolDude, _, ...)" what sort of catastrophe might happen. :) regards, Hung Jung ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com