[Zope] dumb newbie tree prob

hi, i am just scratching the surface of this dtml. i tried to copy some code for the tree tag out of the DTML_Reference but it won't work. i'm clueless, any help is appreciated. here's the source: <dtml-var standard_html_header> <h2><dtml-var title_or_id></h2> <p> This is the <dtml-var id> Document. <dtml-tree> <dtml-var id> </dtml-tree> </p> <dtml-var standard_html_footer> thanks -<mike>-