"JSON Schema is an Internet Draft, currently version 4"
"JSON schema validator, which is designed to be fast and simple to use. The latest IETF published draft is v4, this library is mostly v4 compatible."JSON Schema Lint
"The schema is still under development and the progress can be tracked by comparing the versions known as “drafts”. Currently, the schema is in the 4th version."
"Much like the incoming request, Hyper-schema allows us to specify a schema for the outgoing response as well with the
"Generate API documentation with Prmd."