Paper presented by H. A. (Erik) Proper(E.Proper@cs.ru.nl) and Th. P. van der Weide (Th.P.firstname.lastname@example.org) , Institute for Computing and Information Sciences, Radboud University, Nijmegen, The Netherlands
Abstract: In this paper we introduce some terminology for comparing the expressiveness of conceptual data modeling techjniques such as ER, NIAM, PSM and ORM, that are finitely bounded by their underlying domains. Next we consider schema equivalence and discuss the effects of the sizes of the underlying domains. This leads to the introduction of the concept of finite equivalence, which may serve as a means to better understanding of the fundamentals of modeling concepts (utility). We give some examples of finite equivalence and inequivalence in the context of ORM.
The full paper is available from R.Meersman et al (Eds.): OTM workshops 2005, LNCS 3762, pp 730-739, Springer-Verlag Berlin Heidelberg