@Ladsgroup and @GoranSMilovanovic will develop a concise documentation page going into some more detail on usage aspects in the Wikibase [[ https://phabricator.wikimedia.org/diffusion/EWBA/browse/master/docs/usagetracking.wiki | wbc_entity_usage schema ]]:
https://www.mediawiki.org/wiki/Wikibase/Usage
Specifically, the details will be provided on:
- the structure of `C` aspect records;
- the way `L` and `D` aspects are recorded in respect to the operation of the language fallback mechanism;
- the exact difference between the `S` and `T` records;
- the contexts in which `O` is recorded.
The existing documentation from the above mentioned locations, plus the new details are provided in the new central Usage Tracking documentation: https://doc.wikimedia.org/Wikibase/master/php/md_docs_topics_usagetracking.html