In partial answer to that question:
fixtrading.org/mmt/
"The #MMT (Market Model Typology) Initiative is a collaborative effort established by a broad range of industry participants (trading/reporting venues, data vendors and buy/sell side participants).
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The #MMT initiative is committed to achieving a practical and common solution for standards on post-trade data across all asset classes subject to #MiFIDII."
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Hanno Klein on today's @FIX_Protocol Global Technical Committee #FIXinar again.
FIX session protocol submitted to @isostandards TC68 as a prospective international standard:
#FIXEMEA2020