[Zope] External Method 3

[Tom Deprez]

Ok, now I found the error. The error must be in the while loop, where we
say 'iterate until the obj = None'. However 'None' is never reached... (I
guess). 
The following code works, but I this isn't at all a good solution. 

Can someone tell me how I can safely test that the current object is the
first object in the object database. In other laguages you can test this
with 'nil'. How can I test this within Zope? Please, tell me!

def GetParentNames(self):
  result=[]
  obj=self
  while obj.title != 'Zope':
    obj=obj.aq_parent
    if obj.meta_type=='KBItem':
      result.append(obj.Title)    
  return result

Thanks in advance,

Tom.