As BFG document stated, all the object instances of model graph in Traversal
must have __name__ and __parent__ attribute, and they should be
hierarchically "linked". As the traversal wiki example reveals, page objects
are implementing this rule. But when I look at the source code of bfgsite,
I can't see the rule is followed. The WebSite is the root object so it has
__name__=__parent__=None, but none of it's sub objects (PasteBin/PasteEntry,
TutorialBin/Tutorial) has code of assigning __name__ and __parent__, neither
in object initializing nor object adding part, and I don't find the usage of
traversalwrapper as mentioned in document, in which case we can avoid mange
location aware objects "by hand". So is it a rule of "Must"?
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