Question: possibility to add custom validations

[peter-plochan]

This is follow-up to #190.
In my OpenAPI 3 definition, I would like to introduce x-patternProperties vendor extension based on JSON-schema pattern properties. So let's assume that I have a schema with this extension containing a map of patterns with schemas.
Is there a possibility to add custom validation of such extension to the validator?

[fenollp]

While you should be able to decode and use the extension after/before native schema validation, I would suggest you aim for OpenAPIv3.1 support (if you can) as it sports standard JSON Schema schemas.
See https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.1.0.md#schemaObject
cc #230