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"""
Illustrates various methods of associating multiple types of
parents with a particular child object.
The examples all use the declarative extension along with
declarative mixins. Each one presents the identical use
case at the end - two classes, ``Customer`` and ``Supplier``, both
subclassing the ``HasAddresses`` mixin, which ensures that the
parent class is provided with an ``addresses`` collection
which contains ``Address`` objects.
The :viewsource:`.discriminator_on_association` and :viewsource:`.generic_fk` scripts
are modernized versions of recipes presented in the 2007 blog post
`Polymorphic Associations with SQLAlchemy <http://techspot.zzzeek.org/2007/05/29/polymorphic-associations-with-sqlalchemy/>`_.
.. autosource::
"""
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