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From: "-CELKO-" <jcelko212@earthlink.net>
Newsgroups: comp.databases.theory
Subject: Re: modeling either/or relationship...
Date: 2 Feb 2006 11:45:05 -0800
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Xref: dp-news.maxwell.syr.edu comp.databases.theory:35750

I agree that doors are an attribute and not a subclass.  If we need to
aggregate up the hierarchy, I would have a UNION-ed VIEW on the common
attributes and use it.