which version of JSON schema is supported
json-schema draft 4 and draft 5. Some properties from json-schema draft 3 are also understood, ones that were removed or redefined in draft 4, such as the "required" property. json-schema draft 5 is the same as draft 4 except that the draft itself fixes vocabulary, various typos, and bad examples.
The Swagger/OpenAPI schema object model is understood. It is a subset of json-schema draft 4 with some extensions.
json-schema documents from RAML are also understood.
Support for future json-schema drafts and other JSON type models are anticipated.