[Zope] Can't get dtml-in to work!

[lvw@lfpt.rwth-aachen.de]

Hi,

this must be a very dumb question, but I can't find the mistake. Anyone seeing why
the the following DTML does not work? It does not print anything besides 'Hello',
though I created several folders in the one where the document below resides.
Choosing different meta types doesn't help either...

<dtml-var standard_html_header>
<h2><dtml-var title_or_id></h2>
<p>
Hello
<dtml-in expr="objectValues('Folder')">
   Out there !
   <dtml-var sequence-length>
   <dtml-var getId>

</dtml-in>
</p>
<dtml-var standard_html_footer>

Anyone knows help?

Regards,
Lars