An implementation-agnostic implementation of JSON reference resolution.
In other words, a way for e.g. JSON Schema tooling to resolve the $ref keyword across all drafts (without needing to implement support themselves).
What's here is inspired in part by the budding JSON reference specification(s) (currently housed within the JSON Schema organization but intended to be more broadly applicable), which intend to detach some of the referencing behavior from JSON Schema's own specifications.
See the documentation for more details.