[Zope] Strange 'with' behavior? (Q1959)

Hi, I made another stupid test with strange results: in '/myCDs/' I wrote a DTML Method called 'test': <dtml-with 0001> </dtml-with> 0001 is a ZClass object in myCDs. When I click on the tab view, I was asked to download the file 'test'. I did it. The downloaded file is empty. Sure the test is not very useful, but I try to undestand better how Zope works. Does anyone, can explain the result of my 'test'. Thanks.