infonet-economy

The most important problem that decision makers face in today's ever increasing information flux is how to find efficiently and fast the useful information. Hypermedia Electronic Publishing systems, supporting active information distribution and offering hypertext browsing facilities, provide a promising solution to this problem. Nevertheless several issues, like value added...

In this paper, we describe a technique for integrating heterogeneous information systems using concept bases. A concept base is build on top of each system to integrate, in order to semantically enrich its description. Each concept is described at three different levels: terminological definition, formal characterization, and representation in the underlying system. The different...

This report proposes to employ messengers, initially developed in the context of communication protocols, as a fundamental component of the architecture of distributed operating systems. Current microkernels offer non-local services which require the collaboration of neighboring machines or special servers and are implemented using special protocols. These protocols are hard-wired...

The features of a database system specifically designed to support evolution are presented. The design of the F2 system has been deliberately directed toward integration of evolution features and the flexibility of structures at every level. This has leaded to an architecture where the meta-circular organization of the objects management is not an aesthetic facet but a concrete...

Cell, a model for strongly Distributed Object Based systems is discussed. Its components, the nucleus and the membrane, are presented and their characteristics are described. The notions of trading and type transparency in the context of the Cell model are described and issues related to their design and implementation are presented.

We introduce a model for information systems specification which covers the spaces of data, semantic contexts, events, objects life-cycle, integrity constraints, and operating periods. For each one of these space we define a structure and its interpretation that allow to specify this particular aspect of the system. In this approach data and event structures are independent. It is...