Register TOON as a media type.

registries/_media-type/toon.md

@@ -0,0 +1,26 @@
+---
+owner: handrews
+name: Token-Oriented Object Notation (TOON)
+description: Compact encoding of the JSON data model for LLM prompts
+media_types:
+  - name: text/toon
+    iana: false
+    specifications:
+    - name: TOON Specification
+      url: https://github.com/toon-format/spec/blob/main/SPEC.md
+layout: default
+---
+
+{% capture summary %}
+Since TOON is simply an alternate serialization of the JSON data model, and serialization is not a concern of the OAS, `text/toon` can be treated the same as `application/json` for the purposes of the Schema Object.
+{% endcapture %}
+
+{% capture remarks %}
+Note, however, that TOON specifies object property order preservation in terms of encounter order, which is not necessarily the same as the order of properties in a Schema Object.  JSON Schema is not able to specify object property order.
+
+Similarly, TOON encoding options such as keyfolding are outside of the scope of the Schema Object and the OAS, as they are not specified as media type parameters.
+
+Finally, the `text/toon` media type is provisional; if it is changed, it is expected that the new media type will work the same as the current one.
+{% endcapture %}
+
+{% include media-type-entry.md summary=summary remarks=remarks %}