A Basic Characterization of Relation Migration
C. Maria Keet, Free University of Bozen-Bolzano (Italy)
Alessandro Artale, Free University of Bozen-Bolzano (Italy)
Abstract. Representing and reasoning over evolving objects has been investigated widely. Less attention has been devoted to the similar notion of relation migration, i.e., how tuples of a relation (ORM facts) can evolve along time. We identify different ways how a relation can change over time and give a logicbased semantics to the notion of relation migration to capture its behaviour. We also introduce the notion of lifespan of a relation and clarify the interactions between object migration and relation migration. Its use in graphical conceptual data modelling is illustrated with a minor extension to ORM2 so as to more easily communicate such constraints with domain experts.
Paper available in: Springer LNCS 6428, pp. 484-493
Note: This is a PDF presentation in standard Zip format