The latest Internet-Drafts at the IETF are the draft-wright-json-schema*-01 documents, which correspond to the draft-06 meta-schemas. These were published on 2017-04-15. (Due to a change in authorship the I-D numbering was reset with the previous draft). The specification is split into three parts, Core, Validation, and Hyper-Schema:
|JSON Schema Core||defines the basic foundation of JSON Schema|
|JSON Schema Validation||defines the validation keywords of JSON Schema|
|JSON Hyper-Schema||defines the hyper-media keywords of JSON Schema|
They are also available on the IETF main site: core (draft-wright-json-schema-01), validation (draft-wright-json-schema-validation-01) and hyper-schema (draft-wright-json-schema-hyperschema-01).
Please see Specification Links for older versions and the latest unreleased version of the specification.
The meta-schemas are schemas against which other schemas can be validated. They are self-descriptive: the JSON Schema meta-schema validates itself, while the JSON Hyper-Schema meta-schema both validates itself and defines its own “self” link. The latest meta-schema is draft-06.
|Core/Validation meta-schema||Used for schemas written for pure validation.|
|Hyper meta-schema||Used for schemas written for validation and hyper-linking.|
If you are accessing the above meta-schema links from a web browser, you will need to save the file then open it as a JSON file.