[Zope] reference to a DTML Document in a script called by this Document

Hi, context in a script called from a DTML-Method refers to the containing folder as expected. But context in a script called from a DTML-Document refers also to the containing folder!? Shouldn'd that be the Document itself? Even if I call the script like myscript(this()) in a DTML-Document I cannot get the reference to this DTML-Document. So how do I get reference to a DTML- or ZPT Document in script called from that Document ? -- many thanks for your replies, Elena