Chapter Notes

Many database textbooks discuss mapping ER schemas to relational schemas (e.g., Batini et al. 1992) and mapping UML class diagrams to relational schemas (e.g., Blaha and Premerlani 1998). The mapping extensions to the old ONF algorithm to develop the original version of Rmap were developed jointly by Peter Ritson and Terry Halpin. For more details on mapping 1:1 predicates, see Ritson and Halpin (1993a). For further details on Rmap and its SQL version see Ritson and Halpin (1993b). The version of Rmap discussed in this chapter includes several revisions to cater for new features in ORM 2, such as further options for objectification and open/closed world semantics.