This directory serves as bucket for some alternative models:

SimDB_DM_denormalised.xml 
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This is a "denormalised version" of the model in SimDB_DM.xml.
It may be inspected to see if it is more usable than the original, rather normalised model.
NB Is not kept up to date with recent changes in the main model.

SimulationDomainModel.xml
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Tis is a "domain model", the result of the analysis phase of the project.
Well, it could have been that, but was likely created after the fact.