In the upcoming posts I will give three examples of how to implement backwards backward compatibility using hbm mappings.
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In upcoming posts I will show examples of backwards backward compatibility for slightly more complex refactorings; class merging and class splitting. Most of that will be based on retrieving values with the formula field, but also using some other techniques. The source code for these three (and possibly more) testcases can be found on SVN: https://repos.deltares.nl/repos/delft-tools/trunk/shared/NHibernateBackwardsCompatibility