Function oriented history representation in databases

In the past years the management of temporal data has attracted numerous re searchers resulting to a large number of temporal data extensions to the re lational and object oriented data models. In this paper, the proposed tempo ral data model focuses on the functional characteristics of the histories. The paper introduces a set oriented description of the calendars together w ith a function oriented history concept with a history-algebra. The complet eness of the proposed model with respect to the reduced temporal algebra TA is also proven. The expressive power of the proposed model is demonstrated in. the end of the paper by a hospital example.