[Zope] navigating through Zope

Is it possible to use the .. like in a directory structure? I.e. as URL giving ..\..\Folder meaning: go two folders up Z ODB and then go in Folder directory. This would come in handy... At ZDP, where using a tree to show partials of ZBook. In this tree we've declared : ............ /guide/introduction/starting/Outline/<!--#var tree-item-url --> ... How can we make this url, less environment dependend? Tom.