This page shows all publications that appeared in the IASI annual research reports. Authors currently affiliated with the Institute are always listed with the full name.

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Show all publications of the year  1996, with author Tininini L., in the category IASI Research Reports (or show them all):

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IASI Research Report n. 440   


Bezenchek A., Rafanelli M., Tininini L.

ADAMO: a conceptual model for aggregate data

ABSTRACT

The intrinsically complex nature of aggregate data makes their definition and manipulation particularly difficult. The approaches based on traditional models (or extensions of these) have shown their substantial inadequacy to fully capture the semantics of aggregate data and to offer a versatile way to access such data. We therefore claim that a completely ad hoc approach is required and propose the graphical model ADAMO. In ADAMO the semantic properties of aggregate data are expressed by tree-structures with variously shaped nodes and graphically labelled edges. In particular, these structures allow the user to express not only the conventional category and summary attributes, but also the implicit category attribute, the marginal values, the aggregation hierarchies and whether a category attribute can be summarized, G-summarized or not. Finally, the layered structure of the model allows the user to express primitive concepts to which the several attributes of the statistical objects in the database refer. In this way the integration of aggregate data from distinct information sources is made possible. Moreover, it is shown that the primitive concepts may pave the way for the development of DBMS capable of safely deriving new aggregate data with descriptive attributes different from the stored ones.