The JSON ‘templates’ referred to here are close-to-runtime data instances (i.e. just need the multiple fields expanded and values filled out) of an OPT, but in this ‘compact’ JSON format which programmers seem to prefer, and which is definitely more efficient than standard JSON.
To get an idea of what this kind of JSON looks like, see the Simplified Data Template example (the Lab one) in this draft spec.
That example has programmer-friendly paths, not just compressed data values, and was originally developed by Better (i.e. Marand).
Just to be clear, the wiki page being talked about here is just trying to reach agreement on ‘compact’ JSON form(s) the leaf data items. It’s a work in progress…