If you'd like to put a non-mixin class in the middle of your hierarchy that can define columns that immediate subclasses should have, use the tip of 0.7 (0.7.3 not released yet) and put the directive "__abstract__ = True" on the class - the @declared_attr's on columns should be recognized in that case. You wouldn't want to have "__tablename__ = 'test'" on such a class either since it isn't mapped.
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