Towards OntoUML for software engineering: Transformation of rigid sortal types into relational databases

OntoUML is an ontologically well-founded conceptual modelling language that distinguishes various types of classifiers and relations providing precise meaning to the modelled entities. Efforts arise to incorporate OntoUML into the Model-Driven Development approach as a conceptual modelling language for the PIM of application data. In a prequel paper, we have introduced and outlined our approach for a transformation of OntoUML PIM into a PSM of a relational database. In this paper, we discuss the details of various variants of the transformation of Rigid Sortal types of OntoUML.