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Leif,
Leif Johansson wrote:
If you want to be able to indicate the presence of a feature with
an optional attribute, yes that is exactly how you do it. Object-
classes are you friend. Orthagonal design is good.
Note that for security reasons it might not appropriate in some cases to
give someone or a process write access to the multi-valued object class
attribute. Therefore it is not always possible to indicate the presence
of a feature by presence of an auxiliary object class.