Traversable

[restrictedTraverse]?

http://www.zopezen.org/Members/zopista/1022017227/view - Using restrictedTraverse to check if an object exists - in DTML
https://dzug.org/mailinglisten/zope/archive/2003/2003-09/1062522426837 - restrictedTraverse() und aktuelle URL?
http://www.zopelabs.com/cookbook/992809915 - get Object using URL - sometimes you have a url and want to get the object. and if you have an object how do you get the url?