[Zope] A Method To My Madness?

[Ben Ocean]

Hi;
I'm trying to implement a textbook example using a DTML Method with a 
<dtml-in> tag:

<ul>
<dtml-in expr="objectValues('DTML Document')">
  <li><a href="&dtml-absolute_url;"><dtml-var title_or_id></a></li><br>
</dtml-in>
</ul>

Pretty straight-forward stuff, but strangely it works within DTML Methods 
but *not* within DTML Documents. Other DTML Methods work just fine. What am 
I doing wrong?
TIA,
BenO