[Feature Request] | Disable "unknown keyword" warnings for `x-` Prefix properties

[AHOCHWE]

Description

In case the JSON schema contains an unknown keyword like test and unknown keyword warning is thrown.

WARN  [main] com.networknt.schema.UnknownKeywordFactory:37 Unknown keyword test - 
you should define your own Meta Schema. If the keyword is irrelevant for validation, 
just use a NonValidationKeyword or if it should generate annotations AnnotationKeyword

Feature Request

Is it possible to add a logic that prefixed keywords (for example with x-) will be automatically considered as NonValidationKeywords and thus no warning will be thrown?

Why x- Prefix?

The x- prefix is a well-established convention in JSON Schema for non-standard or custom extensions. It ensures compatibility with tools that ignore unknown keywords (instead of throwing validation errors).

• https://spec.openapis.org/oas/v3.0.3#specification-extensions
• https://swagger.io/docs/specification/v3_0/openapi-extensions/

Having such a standard logic would enable the opportunity that the default behavior of the lib can be used without adding additional source code as described in https://github.com/networknt/json-schema-validator/blob/master/doc/custom-dialect.md. The idea of a more generic solution is derived from the errorMessageKeyword concept.

[justin-tay]

That is OpenAPI and not JSON Schema.

Also, no errors are thrown. A warning is output to the logs only the first time the keyword is encountered. If this isn't desirable just define your own UnknownKeywordFactory.

[AHOCHWE]

Thanks @justin-tay for your reply.

That is OpenAPI and not JSON Schema.
...
Also, no errors are thrown.

Sorry if this was misleading.

• The OpenAPI links are only for reference.
• It's clear for me that a warning is thrown.

If this isn't desirable just define your own UnknownKeywordFactory.

That's why ask for the Feature Request and if you guys find it useful or not to use a standard pattern (like x- prefix) to suppress per default the warning log. My idea was to avoid to do any customization as much as possible. But I can also understand if this feature has no added value :-).