Meta-Schema: JSON validation with JSON Schema draft definition

[perrotuerto]

I want users to write their own JSON schemes, so for the schema key I tried to use jsonschema.validators.Draft202012Validator.META_SCHEMA without success.

I saw in the docs that there are diffs between this implementation and the standard spec. I also read in #127 that referencing external files are not supported (and, therefore, jsonschema.validators.Draft202012Validator.META_SCHEMA is not supported).

It is fine for my use case if this implementation is not exactly as the standard spec.

So what I want to know is:

What can I use as schema so I can validate user writings of their own JSON schemes, is there a "meta schema" I can use?

Thanks for this great work, @bhch!