Classes inherited from this class gain ability to access
collections and their items as simple attributes. Access to
collection items "internals" is done via <collection_name> attribute
and interface of a corresponding Collection.
    | a new object with type S, a subtype of T |  | 
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          | __init__(self,
        descr=None,
        **kwargs) x.__init__(...) initializes x; see help(type(x)) for signature
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          | __repr__(self,
        prefixes=None,
        fullname=False) String definition of the object of ClassWithCollections object
 | source code |  | 
  
    | Inherited from object:__delattr__,__format__,__hash__,__reduce__,__reduce_ex__,__sizeof__,__subclasshook__ |