Model Driven Development (MDD) approach is often used to model application
data and behavior by a Platform Independent Model (PIM) and to generate
Platform Specific Models (PSMs) and even the source code by model
transformations. However, these transformations usually omit constraints of
the binary association multiplicities, especially the source class
optionality constraint. This paper is an extended version of the paper
?Transformation of Special Multiplicity Constraints - Comparison of Possible
Realizations? presented at MDASD workshop at the FedCSIS 2012 conference. In
this paper, we summarize the process of the transformation of a binary
association from a PIM into a PSM for relational databases. We suggest
several possible realizations of the source class optionality constraint to
encourage the automatically transformation and discuss their advantages and
disadvantages.We also provide experimental comparison of our suggested
realizations to the common realization where this constraint is omitted.
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