Gerard Metrailler Jr. writes:

Hello,

I am trying to get the following more generic.

<dtml-var "content.whos_who.gmetrail.real_name">

In that case, content and whos_who are folder, gmetrail is a ZClass I created which derivates from Image and real_name is a property of that object.

What I am trying to do is getting something like:

<dtml-var "user_info + REQUEST.AUTHENTICATED_USER + real_name"> where user_info is a property that I defined in / You do not want to access a fixed variable but want the variable to be accessed computed in some way.

Computed variable access is provided by "_[expression]" Sometimes, you must use: "_.getitem(expression)" Both forms evaluate "expression" into a variable name and look it up in the namespace resulting in an object. The first form calls the object, if it is callable, and returns the result of this function call. The second form always returns the object itself without calling it. For a DTML document/method "calling" means rendering, thus the result is a string. There is a related need: computed attribute access. Here, an attribute to be accessed is not fixed but must be computed. You would use "_.getattr(object,expression)" in this case. Dieter