Abstract

<F1.409e+04> The entity-relationship (ER) model has proved a successful conceptual capture and modelling tool for the relational data model. Much effort has recently been made to extend the relational data model to describe historical information, but as yet little corresponding development in ER modelling has been made. We describe in detail the various temporal behaviours that entities and relationships may exhibit, and apply the results to enhance a binary ER model with temporal semantics. The resultant ERT may be used to fully model historical relational database schemata.<F2.323e+04> Keywords:<F1.409e+04> Semantic Data Models, Entity-Relationship Models, Temporal Databases, Historical Databases.<F2.323e+04> Introduction<F1.409e+04> The semantical data models of the past have focused on data representation without considering in depth the temporal and behavioural aspects of information modelling. A large proportion of research into temporal data models and query languages has be...

Citations

2	Integrating Database Technology, Rule Based Systems and Temporal Reasoning for Effective Software, Pericles Loucopoulos, Peter M c . Brien, Ulf Persson, Franois Schumacker - TEMPORA - 1990
2	The Entity-Relationship Time Model and the Conceptual Rule Language - Theodoulidis, Loucopoulos, et al. - 1991