Sync with registry.

Co-authored-by: Mike Kistler <[email protected]>

Author: handrews

versions/3.1.1.md

@@ -212,6 +212,7 @@ As defined by the [JSON Schema Validation specification](https://tools.ietf.org/
 The OpenAPI Initiative also hosts a [Format Registry](https://spec.openapis.org/registry/format/) for formats defined by OAS users and other specifications. Support for any registered format is strictly OPTIONAL, and support for one registered format does not imply support for any others.
 
 Types that are not accompanied by a `format` keyword follow the type definition in the JSON Schema. Tools that do not recognize a specific `format` MAY default back to the `type` alone, as if the `format` is not specified.
+For the purpose of [JSON Schema validation](https://datatracker.ietf.org/doc/html/draft-bhutton-json-schema-validation-00#section-7.1), each format should specify the set of JSON data types for which it applies. In this registry, these types are shown in the "JSON Data Type" column.
 
 The formats defined by the OAS are: