[Zope] Referecing items in subfolders

Hello all, have a small question. Imagine you have the following folder structure in Zope: http://testserver.pclaerhout.com/index_html http://testserver.pclaerhout.com/resources/standard_header http://testserver.pclaerhout.com/resources/standard_footer How can I reference the standard_header document (which is in a subdirectory) from the index_html document, for example using a <dtml-var standard_header>?? I have the same question if the files in the subdirectory are for example SQL methods. I'm just looking for a way to separate different kinds of documents. Kind regards, Pieter