Draft 2020-12. optional/format-assertion.json

[georgeakulov]

Hi! The first schema expects the "format" keyword to be processed. In the loaded "$schema," only the "core" vocabulary is true, and the format-assertion dictionary is false Please explain why format processing is necessary in this test?

[jdesrosiers]

This question was asked recently. See, #814 and let us know if it's still unclear.

[georgeakulov]

Thanks for the link.
As I understand it, if a vocabulary isn't specified, its keywords shouldn't be processed. If a vocabulary is specified, its Boolean value affects behavior as follows.

false Process this vocabulary keywords if this vocabulary is supported. If not supported, processing is optional.
true This vocabulary must be processed. If this vocabulary isn't supported by the implementation, the validation result is false (or, I think, a better option is an error indicating that the vocabulary isn't implemented).

[jdesrosiers]

false Process this vocabulary keywords if this vocabulary is supported. If not supported, processing is optional.

Correct. I'm not sure the last sentence makes sense, but I think you have the right idea. If the vocabulary isn't supported, the keywords are ignored and the rest of the schema is processed normally.

true This vocabulary must be processed. If this vocabulary isn't supported by the implementation, the validation result is false (or, I think, a better option is an error indicating that the vocabulary isn't implemented).

Mostly correct. Your "or better option" is the correct behavior. Validation MUST NOT return a result (true/false) if the vocabulary isn't supported. It MUST refuse to process the schema (such as by throwing an error).