[Zope] evaluate request string as dtml-tree folder

[jason yee]

hi,

i'm sure this problem has a relatively simple fix, but since i'm new to
zope it's all somewhat complex to me.

i'm trying to pass an arguement from the REQUEST (e.g.
myzope.com/index_html?foo=bar) to a dtml-tree in a dtml method (e.g.
<dtml-tree foo branches="obejctValues"> where foo's content should
evaluate as a folder which the tree will use as a root).

i think the issue is that the <dtml-tree> sees foo as a string and not
an object/folder.  is there anyway of getting the foo string evaluated
or converted to an object?

thanks,
jason yee