A temporal data model and management system for normative texts in XML format

In this paper, we present the results of an on-going researchactivity concerning the temporal management of normativetexts in XML format. In particular, four temporal dimen-sions (publication, validity, e\ub1cacy and transaction times)are used to correctly represent the evolution of norms intime and their resulting versioning. Hence, we introduce amultiversion data model based on XML schema and de\uafnebasic mechanisms for the management of norm texts. Fi-nally, we describe a prototype management system whichhas been implemented and evaluated