@tauscher
Thx for clarification that DTV is not meant to guarantee lossless roundtrips.
DTV is a concept that is already available to the market.
“Lossless roundtrip” and “conservative IFC processing” are long-term ideas/concepts (around 10 years to market) that need further discussion and refinement. It is related to CDE concepts with “partial model exchange from a server” (IfcStateEnum).
But definitiely this are other topics:
https://forums.buildingsmart.org/t/audit-trail-indisputable-documentation
https://forums.buildingsmart.org/t/ifc-tool-performance-normalization-and-round-trip-preservation-as-enabler-for-bim-level-3-cdes
https://forums.buildingsmart.org/t/ifcownerhistory