[Zope] Referencing a dtml method in a subfolder of the parent folder

Hi! Maybe this is a very simple question, but I can't find information about it anywhere. In a dtml method I want to include a dtml method which is in another subfolder of the parent folder. So if I have a folder called 'folder', which has two subfolders called 'subfolder1' and 'subfolder2', and each has a dtml method called 'method1' and 'method2', how can I include 'method2' in 'method1'? I've tried '<dtml-var ../subfolder2/method2>', but it doesn't work. Thanks in advance, Igor Leturia