Elaborate things that would be ideal from a schema and which schemas have them

[plocket]

Description of the feature / enhancement.

Need	JSON Schema
Only allow certain siblings	✔
Exclude certain siblings (so we don't have to list all the props as allowed props)	✔
Require certain siblings	✔
Allow "continue button field" to be alone sometimes, but also with other props sometimes	✔
Only allow certain pre-defined values	✔
questions sometimes can just have buttons and sometimes it needs more (e.g. exit needs something more to trigger the screen)	probably
Specify a type of string, like mako, python, var names, etc.	See comments

Are you making a PR for this?

Yes, I will create a PR.

[plocket]

[I'm currently using draft-07.] In JSON Schema draft 2019-09, they add "content schemas" that may help us with python and such. I'm unclear on whether their content can be customized or is limited to certain values

[plocket]

Draft 2020-12 has "content" that includes contentEncoding, contentMediaType, and contentSchema. It's a little hard to tell what values those are allowed to have.

Edit:
More resources have links to a more readable list that seems to include programming languages. It has javascript, css, and markdown, but I don't see mako or python. This may just be a limited list, though, and the spec may be broader than this.

.py as a MIME type: text/x-script.phyton.

No character set name other than those defined above may be used in
Internet mail without the publication of a formal specification and
its registration with IANA, or by private agreement, in which case
the character set name must begin with "X-".

- RFC2046

It looks like mako (templates) is a python template engine. I don't know if that means it's a python lib, its own filetype/MIME type, or what. Some feedback:

Mako is a language used in another file type, not a file type itself

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Some drafts have the format keyword, where you can sometimes specify custom formats, though the ones I see supported for 2020-12 wouldn't be enough for us.