The latest Internet-Draft at the IETF is v5, published 2016-10-13. (Due to a change in authorship the I-D numbering has been reset). 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-00), validation (draft-wright-json-schema-validation-00) and hyper-schema (draft-wright-json-schema-hyperschema-00).
The meta-schemas are the schemas which define the JSON Schema and Hyper-Schema formats.
The latest meta-schema is draft-04. A future release with additional keywords will be published in the near future.
|Core/Validation Meta-Schema||Used for schemas written for pure validation.|
|Hyper Meta-Schema||Used for schemas written for validation and hyper-linking.|
These sample schemas describe simple data structures which can be expressed as JSON:
|Geographic Coordinate||a location as longitude and latitude|
|Card||a microformat-style representation of a person, company, organization, or place|
|Calendar||a microformat-style representation of an event|
|Address||a microformat-style representation of a street address|