class webdir(db.model):
  name = db.StringProperty()

class webcontain(db.model):
  dirA = db.ReferenceProperty(webdir)
  dirB = db.ReferenceProperty(webdir)

When running, a duplex property error for model "webdir" will pop out.
Basicly I blelive there is a bug in the db library when try to define
a property "webcontain_set" for model "webdir". Looks like it did not
consider there maybe 2 reference in "webcontain" model to the same
"webdir" model

That is blocking my application development.Wish it could be fixed
soon.
Parts of the error:

   File "E:\Program Files\Google\google_appengine\google\appengine\ext
\db\__init_
_.py", line 296, in __init__
    attr.__property_config__(cls, attr_name)
  File "E:\Program Files\Google\google_appengine\google\appengine\ext
\db\__init_
_.py", line 2232, in __property_config__
    self.collection_name))
DuplicatePropertyError: Class WebUsers already has property webdir_set

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