[Zope] Namespace problem with folders starting with numbers

I need to retrieve a property nested at a document placed within folders whose names start with numbers. Like this: <dtml-var "folder1.2000.12345.dtmldoc.this_property"> This sintax is invalid because there are object names that are starting with numbers, within the Python expression. Is there a workaround? (I've tried the usual ones, unsuccessfully). Ausum