Class f.l.l.DeferredStoredObject(object):

The actual stored object can only be resolved by the StoredMediumAdapter itself

Imagine...:

>>> from fixture import DataSet
>>> class PersonData(DataSet):
...     class adam:
...         father=None
...     class eve:
...         father=None
...     class jenny:
...         pass
...     jenny.father = adam
...

This would be a way to indicate that jenny's father is adam. This class will encapsulate that reference so it can be resolved as close to when it was created as possible.