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In many applications, for example in representing data concerning historical “objects”, alternatives are the rule; so we are led to a probabilistic scheme in their representation. A deterministic approach, which underlies actual DBMS types, leads to very poor results, and, in certain cases, to misleading ones too. An extension of relational… (More)
Large scale applications require the integration of logical and physical resources (i.e. systems) to be mainly operated by non programmers. In many cases this integration is obtained by gathering in a computer network the different systems which are part of the application itself. The Reference Model of Open Systems Interconnection (OSI) provides a common… (More)