The spec makes numerous references to `{format: base64}` ([here](https://github.com/OAI/OpenAPI-Specification/blob/fbe62006211838a8bb7bf2433a1d15f1a5838a03/versions/3.0.1.md#considerations-for-file-uploads) and [here](https://github.com/OAI/OpenAPI-Specification/blob/fbe62006211838a8bb7bf2433a1d15f1a5838a03/versions/3.0.1.md#special-considerations-for-multipart-content) for example). However this format is not defined in either [the wright-00 JSON-schema spec](https://tools.ietf.org/html/draft-wright-json-schema-validation-00#section-7.3), nor in [the OAS3 defined data types](https://github.com/OAI/OpenAPI-Specification/blob/fbe62006211838a8bb7bf2433a1d15f1a5838a03/versions/3.0.1.md#data-types).