You perhaps should consider COP alone given your needs. COP'DAM, while poor, could be OK functionally wyse. Just test before for performance (COP11) was unuseable with 40.000+ photos, and check several long term basic missing things (see another post of mine for examples)
It's about different actual files. Think of RAW+JPEGS (different files corresponding to different usages/publications of the same shot) but generalized across folders and even volumes (incl FTP or WebDav) and with customizable filename patterns. And with propagation of metadata (like stars and keywords) across versions.Not sure what exactly you mean with picture versions. To me they are different (PIE) adjustment versions and thus need to be a feature of the PIE.Interoperation with DXO is flawless and it is very efficient (look for instance at the versioning system which is really neat, automatically agregating picture versions even in different folders and on different volumes, with metadata propagation so you can continue keywording after export).
