Object-oriented applications make considerable use of
inheritance, and they frequently want to use that inheritance (or "is-a")
relationship to categorize and organize objects within a given system. This
can prove difficult in a relational storage scheme, which has no intrinsic
concept of inheritance, but in an OODBMS, it's a core feature. In this
installment of The busy Java developer's guide to db4o, discover the
surprising ease (and power) of using inheritance as a core feature when
creating queries in db4o.

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