This installment should have been the continuation of our presentation of physical implementations of the version patterns discussed thus far. It should have presented a physical implementation of Version Patterns 4 and 5. However, because editors are just plain tough when it comes to deadlines, and because of some personal exigencies with the authors, we are unable to stick to this logical sequence. Instead, in this article, we will consolidate and extend some of the things we have learned about the semantic constraints that apply to versions, and especially to what referential integrity means when applied to versions.


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