This paper describes a way for representing topology in GISs when an O-ODBMS is used as platform. Object-oriented systems allow to model geometric data and topological relationships. thanks to the object identity, the modeling flexibility, the inheritance, and the overriding/overloading features. The representation adopted for topology is a trade-off between avoiding data redundancy and maintaining database schema independence. A small set of user-oriented spatial relationships and operators is used as formal background for the actual implementation of topology. Our experience has been carried out with the O2 system.
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