All the specifications (the text descriptions of the data model located in the /doc directory of each daat model) for the different domains and languages (currently French and Spanish besides English) have been updated to the new format. See an example in Spanish and French.
All of them are generated automatically from the json schema (which is the unique source of truth for the data model)
The contribution manual explains further details.
Raise an issue for any point you find in the new format.
Slack channel
Validate a payload with a data model